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class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#1870–1899"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>1870–1899</span> </div> </a> <ul id="toc-1870–1899-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-20th_century" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#20th_century"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>20th century</span> </div> </a> <ul id="toc-20th_century-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Forecast_sub-organizations" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Forecast_sub-organizations"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Forecast sub-organizations</span> </div> </a> <button aria-controls="toc-Forecast_sub-organizations-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Forecast sub-organizations subsection</span> </button> <ul id="toc-Forecast_sub-organizations-sublist" class="vector-toc-list"> <li id="toc-Fire_weather" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Fire_weather"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Fire weather</span> </div> </a> <ul id="toc-Fire_weather-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Weather_Forecast_Offices" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Weather_Forecast_Offices"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Weather Forecast Offices</span> </div> </a> <ul id="toc-Weather_Forecast_Offices-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-National_Centers_for_Environmental_Prediction" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#National_Centers_for_Environmental_Prediction"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>National Centers for Environmental Prediction</span> </div> </a> <ul id="toc-National_Centers_for_Environmental_Prediction-sublist" class="vector-toc-list"> <li id="toc-Aviation" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Aviation"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.1</span> <span>Aviation</span> </div> </a> <ul id="toc-Aviation-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Storm_Prediction_Center" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Storm_Prediction_Center"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.2</span> <span>Storm Prediction Center</span> </div> </a> <ul id="toc-Storm_Prediction_Center-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Weather_Prediction_Center" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Weather_Prediction_Center"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.3</span> <span>Weather Prediction Center</span> </div> </a> <ul id="toc-Weather_Prediction_Center-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-River_Forecast_Centers" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#River_Forecast_Centers"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.4</span> <span>River Forecast Centers</span> </div> </a> <ul id="toc-River_Forecast_Centers-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Ocean_Prediction_Center" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Ocean_Prediction_Center"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.5</span> <span>Ocean Prediction Center</span> </div> </a> <ul id="toc-Ocean_Prediction_Center-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-National_Hurricane_Center" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#National_Hurricane_Center"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.6</span> <span>National Hurricane Center</span> </div> </a> <ul id="toc-National_Hurricane_Center-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Climate_Prediction_Center" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Climate_Prediction_Center"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.7</span> <span>Climate Prediction Center</span> </div> </a> <ul id="toc-Climate_Prediction_Center-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Data_acquisition" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Data_acquisition"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Data acquisition</span> </div> </a> <button aria-controls="toc-Data_acquisition-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Data acquisition subsection</span> </button> <ul id="toc-Data_acquisition-sublist" class="vector-toc-list"> <li id="toc-Surface_observations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Surface_observations"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Surface observations</span> </div> </a> <ul id="toc-Surface_observations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Marine_observations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Marine_observations"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Marine observations</span> </div> </a> <ul id="toc-Marine_observations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Upper_air_observations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Upper_air_observations"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Upper air observations</span> </div> </a> <ul id="toc-Upper_air_observations-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Event-driven_products" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Event-driven_products"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Event-driven products</span> </div> </a> <button aria-controls="toc-Event-driven_products-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Event-driven products subsection</span> </button> <ul id="toc-Event-driven_products-sublist" class="vector-toc-list"> <li id="toc-Weather_warnings_and_advisories" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Weather_warnings_and_advisories"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Weather warnings and advisories</span> </div> </a> <ul id="toc-Weather_warnings_and_advisories-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Product_dissemination" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Product_dissemination"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Product dissemination</span> </div> </a> <ul id="toc-Product_dissemination-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Technology" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Technology"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Technology</span> </div> </a> <ul id="toc-Technology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Organization" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Organization"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Organization</span> </div> </a> <ul id="toc-Organization-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Privatization_and_dismantling_attempts" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Privatization_and_dismantling_attempts"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Privatization and dismantling attempts</span> </div> </a> <button aria-controls="toc-Privatization_and_dismantling_attempts-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Privatization and dismantling attempts subsection</span> </button> <ul id="toc-Privatization_and_dismantling_attempts-sublist" class="vector-toc-list"> <li id="toc-Aborted_Byrne_proposal,_1983" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Aborted_Byrne_proposal,_1983"> <div class="vector-toc-text"> <span class="vector-toc-numb">8.1</span> <span>Aborted Byrne proposal, 1983</span> </div> </a> <ul id="toc-Aborted_Byrne_proposal,_1983-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Failed_Santorum_proposal,_2005" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Failed_Santorum_proposal,_2005"> <div class="vector-toc-text"> <span class="vector-toc-numb">8.2</span> <span>Failed Santorum proposal, 2005</span> </div> </a> <ul id="toc-Failed_Santorum_proposal,_2005-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Accuracy_problems" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Accuracy_problems"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Accuracy problems</span> </div> </a> <ul id="toc-Accuracy_problems-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">12</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">National Weather Service</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 24 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-24" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">24 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AE%D8%AF%D9%85%D8%A9_%D8%A7%D9%84%D8%B7%D9%82%D8%B3_%D8%A7%D9%84%D9%88%D8%B7%D9%86%D9%8A%D8%A9" title="خدمة الطقس الوطنية – Arabic" lang="ar" hreflang="ar" data-title="خدمة الطقس الوطنية" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%A8%E0%A5%87%E0%A4%B6%E0%A4%A8%E0%A4%B2_%E0%A4%B5%E0%A5%87%E0%A4%A6%E0%A4%B0_%E0%A4%B8%E0%A4%B0%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%B8" title="नेशनल वेदर सर्विस – Bhojpuri" lang="bh" hreflang="bh" data-title="नेशनल वेदर सर्विस" data-language-autonym="भोजपुरी" data-language-local-name="Bhojpuri" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – German" lang="de" hreflang="de" data-title="National Weather Service" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Ameerika_%C3%9Chendriikide_riiklik_ilmateenistus" title="Ameerika Ühendriikide riiklik ilmateenistus – Estonian" lang="et" hreflang="et" data-title="Ameerika Ühendriikide riiklik ilmateenistus" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Servicio_Meteorol%C3%B3gico_Nacional_(Estados_Unidos)" title="Servicio Meteorológico Nacional (Estados Unidos) – Spanish" lang="es" hreflang="es" data-title="Servicio Meteorológico Nacional (Estados Unidos)" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AE%D8%AF%D9%85%D8%A7%D8%AA_%D9%87%D9%88%D8%A7%D8%B4%D9%86%D8%A7%D8%B3%DB%8C_%D9%85%D9%84%DB%8C_%D8%A7%DB%8C%D8%A7%D9%84%D8%A7%D8%AA_%D9%85%D8%AA%D8%AD%D8%AF%D9%87_%D8%A2%D9%85%D8%B1%DB%8C%DA%A9%D8%A7" title="خدمات هواشناسی ملی ایالات متحده آمریکا – Persian" lang="fa" hreflang="fa" data-title="خدمات هواشناسی ملی ایالات متحده آمریکا" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – French" lang="fr" hreflang="fr" data-title="National Weather Service" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%AF%B8%EA%B5%AD_%EA%B5%AD%EB%A6%BD%EA%B8%B0%EC%83%81%EC%B2%AD" title="미국 국립기상청 – Korean" lang="ko" hreflang="ko" data-title="미국 국립기상청" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – Italian" lang="it" hreflang="it" data-title="National Weather Service" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – Hungarian" lang="hu" hreflang="hu" data-title="National Weather Service" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Perkhidmatan_Cuaca_Kebangsaan" title="Perkhidmatan Cuaca Kebangsaan – Malay" lang="ms" hreflang="ms" data-title="Perkhidmatan Cuaca Kebangsaan" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%A2%E3%83%A1%E3%83%AA%E3%82%AB%E5%9B%BD%E7%AB%8B%E6%B0%97%E8%B1%A1%E5%B1%80" title="アメリカ国立気象局 – Japanese" lang="ja" hreflang="ja" data-title="アメリカ国立気象局" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="National Weather Service" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="National Weather Service" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Servi%C3%A7o_Nacional_de_Meteorologia_dos_Estados_Unidos" title="Serviço Nacional de Meteorologia dos Estados Unidos – Portuguese" lang="pt" hreflang="pt" data-title="Serviço Nacional de Meteorologia dos Estados Unidos" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9D%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F_%D0%BC%D0%B5%D1%82%D0%B5%D0%BE%D1%80%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F_%D1%81%D0%BB%D1%83%D0%B6%D0%B1%D0%B0" title="Национальная метеорологическая служба – Russian" lang="ru" hreflang="ru" data-title="Национальная метеорологическая служба" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – Simple English" lang="en-simple" hreflang="en-simple" data-title="National Weather Service" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%AE%D8%B2%D9%85%DB%95%D8%AA%DA%AF%D9%88%D8%B2%D8%A7%D8%B1%DB%8C%DB%8C_%DA%A9%DB%95%D8%B4%D9%88%DA%BE%DB%95%D9%88%D8%A7%DB%8C_%D9%86%DB%8C%D8%B4%D8%AA%D9%85%D8%A7%D9%86%DB%8C%DB%8C_%D9%88%DB%8C%D9%84%D8%A7%DB%8C%DB%95%D8%AA%DB%95_%DB%8C%DB%95%DA%A9%DA%AF%D8%B1%D8%AA%D9%88%D9%88%DB%95%DA%A9%D8%A7%D9%86%DB%8C_%D8%A6%DB%95%D9%85%D8%B1%DB%8C%DA%A9%D8%A7" title="خزمەتگوزاریی کەشوھەوای نیشتمانیی ویلایەتە یەکگرتووەکانی ئەمریکا – Central Kurdish" lang="ckb" hreflang="ckb" data-title="خزمەتگوزاریی کەشوھەوای نیشتمانیی ویلایەتە یەکگرتووەکانی ئەمریکا" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Yhdysvaltain_kansallinen_s%C3%A4%C3%A4palvelu" title="Yhdysvaltain kansallinen sääpalvelu – Finnish" lang="fi" hreflang="fi" data-title="Yhdysvaltain kansallinen sääpalvelu" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/National_Weather_Service" title="National Weather Service – Swedish" lang="sv" hreflang="sv" data-title="National Weather Service" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Ulusal_Hava_Durumu_Servisi" title="Ulusal Hava Durumu Servisi – Turkish" lang="tr" hreflang="tr" data-title="Ulusal Hava Durumu Servisi" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a 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.geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=National_Weather_Service&params=38_59_30_N_77_01_48_W_region:US-DC_type:landmark_source:kolossus-dewiki"><span class="geo-default"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">38°59′30″N</span> <span class="longitude">77°01′48″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-nondefault"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">38.99167°N 77.03000°W</span><span style="display:none"> / <span class="geo">38.99167; -77.03000</span></span></span></a></span></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">U.S. forecasting agency of the National Oceanic and Atmospheric Administration</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"Weather Bureau" redirects here. For other uses, see <a href="/wiki/Meteorological_Administration_(disambiguation)" class="mw-redirect mw-disambig" title="Meteorological Administration (disambiguation)">Meteorological Administration</a>.</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><caption class="infobox-title" style="font-size: 125%;">National Weather Service</caption><tbody><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:US-NationalWeatherService-Logo.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/US-NationalWeatherService-Logo.svg/200px-US-NationalWeatherService-Logo.svg.png" decoding="async" width="200" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/US-NationalWeatherService-Logo.svg/300px-US-NationalWeatherService-Logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/US-NationalWeatherService-Logo.svg/400px-US-NationalWeatherService-Logo.svg.png 2x" data-file-width="720" data-file-height="720" /></a></span></td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #efefef">Agency overview</th></tr><tr><th scope="row" class="infobox-label">Formed</th><td class="infobox-data">February 9, 1870<span class="noprint">; 154 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1870-02-09</span>)</span></td></tr><tr><th scope="row" class="infobox-label">Preceding agency</th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li style="text-indent: -1em; padding-left: 1em;"><span class="nowrap">United States Weather Bureau</span></li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Jurisdiction</th><td class="infobox-data"><a href="/wiki/Federal_government_of_the_United_States" title="Federal government of the United States">United States federal government</a></td></tr><tr><th scope="row" class="infobox-label">Headquarters</th><td class="infobox-data"><a href="/wiki/Silver_Spring,_Maryland" title="Silver Spring, Maryland">Silver Spring, Maryland</a><br /><span class="geo-inline"><style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=National_Weather_Service&params=38_59_30_N_77_01_48_W_region:US-DC_type:landmark_source:kolossus-dewiki"><span class="geo-default"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">38°59′30″N</span> <span class="longitude">77°01′48″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-nondefault"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">38.99167°N 77.03000°W</span><span style="display:none"> / <span class="geo">38.99167; -77.03000</span></span></span></a></span></span></td></tr><tr><th scope="row" class="infobox-label">Annual budget</th><td class="infobox-data"><a href="/wiki/US$" class="mw-redirect" title="US$">US$</a>1.204 billion (<a href="/wiki/Fiscal_year#Federal_government" title="Fiscal year">FY</a> 2021)</td></tr><tr><th scope="row" class="infobox-label">Agency executive</th><td class="infobox-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li style="text-indent: -1em; padding-left: 1em;"><a href="/wiki/Ken_Graham" title="Ken Graham">Kenneth Graham</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>, Director</li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Parent agency</th><td class="infobox-data"><a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a></td></tr><tr><th scope="row" class="infobox-label">Child agency</th><td class="infobox-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li style="text-indent: -1em; padding-left: 1em;"><a href="/wiki/National_Centers_for_Environmental_Prediction" title="National Centers for Environmental Prediction">National Centers for Environmental Prediction</a></li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Key document</th><td class="infobox-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li style="text-indent: -1em; padding-left: 1em;">16 <a href="/wiki/United_States_Statutes_at_Large" title="United States Statutes at Large">Stat.</a> <a rel="nofollow" class="external text" href="https://legislink.org/us/stat-16-369">369</a></li></ul></div></td></tr><tr><th scope="row" class="infobox-label">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://www.weather.gov">weather.gov</a></span></td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #efefef">Footnotes</th></tr><tr><td colspan="2" class="infobox-full-data"><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> <sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></td></tr></tbody></table> <p>The <b>National Weather Service</b> (<b>NWS</b>) is an <a href="/wiki/Government_agency" title="Government agency">agency</a> of the <a href="/wiki/Federal_government_of_the_United_States" title="Federal government of the United States">United States federal government</a> that is tasked with providing weather forecasts, warnings of hazardous weather, and other weather-related products to organizations and the public for the purposes of protection, safety, and general information. It is a part of the <a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a> (NOAA) branch of the <a href="/wiki/United_States_Department_of_Commerce" title="United States Department of Commerce">Department of Commerce</a>, and is headquartered in <a href="/wiki/Silver_Spring,_Maryland" title="Silver Spring, Maryland">Silver Spring, Maryland</a>, within the <a href="/wiki/Washington_metropolitan_area" title="Washington metropolitan area">Washington metropolitan area</a>.<sup id="cite_ref-census1_6-0" class="reference"><a href="#cite_note-census1-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NWSsite_7-0" class="reference"><a href="#cite_note-NWSsite-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> The agency was known as the <b>United States Weather Bureau</b> from 1890 until it adopted its current name in 1970.<sup id="cite_ref-Nass1_8-0" class="reference"><a href="#cite_note-Nass1-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>The NWS performs its primary task through a collection of national and regional centers, and 122 local <a href="/wiki/List_of_National_Weather_Service_Weather_Forecast_Offices" class="mw-redirect" title="List of National Weather Service Weather Forecast Offices">Weather Forecast Offices</a> (WFOs). As the NWS is an agency of the U.S. federal government, most of its products are in the <a href="/wiki/Copyright_status_of_work_by_the_U.S._government" class="mw-redirect" title="Copyright status of work by the U.S. government">public domain</a> and available free of charge. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_(Maryland_State_Route_410)_in_Silver_Spring,_Montgomery_County,_Maryland.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c2/2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_%28Maryland_State_Route_410%29_in_Silver_Spring%2C_Montgomery_County%2C_Maryland.jpg/220px-2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_%28Maryland_State_Route_410%29_in_Silver_Spring%2C_Montgomery_County%2C_Maryland.jpg" decoding="async" width="220" height="297" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c2/2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_%28Maryland_State_Route_410%29_in_Silver_Spring%2C_Montgomery_County%2C_Maryland.jpg/330px-2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_%28Maryland_State_Route_410%29_in_Silver_Spring%2C_Montgomery_County%2C_Maryland.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c2/2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_%28Maryland_State_Route_410%29_in_Silver_Spring%2C_Montgomery_County%2C_Maryland.jpg/440px-2016-05-09_17_24_44_National_Weather_Service_headquarters_on_East-West_Highway_%28Maryland_State_Route_410%29_in_Silver_Spring%2C_Montgomery_County%2C_Maryland.jpg 2x" data-file-width="2377" data-file-height="3207" /></a><figcaption>NWS HQ in <a href="/wiki/Silver_Spring,_Maryland" title="Silver Spring, Maryland">Silver Spring, Maryland</a></figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="1870–1899"><span id="1870.E2.80.931899"></span>1870–1899</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=2" title="Edit section: 1870–1899"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Calls for the creation of a government weather bureau began as early as 1844, when the <a href="/wiki/Electrical_telegraph" title="Electrical telegraph">electrical telegraph</a> was introduced. In 1869, <a href="/wiki/Cleveland_Abbe" title="Cleveland Abbe">Cleveland Abbe</a> began developing probabilistic forecasts using daily weather data sent via telegraph by the <a href="/wiki/Cincinnati" title="Cincinnati">Cincinnati</a> Chamber of Commerce and <a href="/wiki/Western_Union" title="Western Union">Western Union</a>, which he convinced to back the collection of such information. Meanwhile, <a href="/wiki/Increase_A._Lapham" title="Increase A. Lapham">Increase A. Lapham</a> of Wisconsin lobbied <a href="/wiki/United_States_Congress" title="United States Congress">Congress</a> to create such a service, having witnessed the destructive power of storms in the <a href="/wiki/Great_Lakes" title="Great Lakes">Great Lakes</a> region.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Representative <a href="/wiki/Halbert_E._Paine" title="Halbert E. Paine">Halbert E. Paine</a> introduced a bill to provide the funding. In 1870, the Weather Bureau of the United States was established through a <a href="/wiki/Joint_resolution" title="Joint resolution">joint resolution</a> of Congress signed by President <a href="/wiki/Ulysses_S._Grant" title="Ulysses S. Grant">Ulysses S. Grant</a><sup id="cite_ref-nwshistory1_10-0" class="reference"><a href="#cite_note-nwshistory1-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> with a mission to "provide for taking meteorological observations at the military stations in the interior of the continent and at other points in the States and Territories... and for giving notice on the northern <a href="/wiki/Great_Lakes" title="Great Lakes">(Great) Lakes</a> and on the seacoast by magnetic <a href="/wiki/Telegraph" class="mw-redirect" title="Telegraph">telegraph</a> and marine signals, of the approach and force of storms." The agency was placed under the <a href="/wiki/United_States_Secretary_of_War" title="United States Secretary of War">Secretary of War</a> as Congress felt "military discipline would probably secure the greatest promptness, regularity, and accuracy in the required observations."<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Within the <a href="/wiki/United_States_Department_of_War" title="United States Department of War">Department of War</a>, it was assigned to the <a href="/wiki/U.S._Army_Signal_Corps" class="mw-redirect" title="U.S. Army Signal Corps">U.S. Army Signal Service</a> under Brigadier General <a href="/wiki/Albert_J._Myer" title="Albert J. Myer">Albert J. Myer</a>. General Myer gave the National Weather Service its first name: The Division of Telegrams and Reports for the Benefit of Commerce.<sup id="cite_ref-ScanningSkies_12-0" class="reference"><a href="#cite_note-ScanningSkies-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>Abbe was appointed as the Bureau's first chief meteorologist. In his earlier role as the civilian assistant to the chief of the Signal Service, Abbe urged the Department of War to research weather conditions to provide a scientific basis behind the forecasts; he would continue to urge the study of <a href="/wiki/Meteorology" title="Meteorology">meteorology</a> as a science after becoming Weather Bureau chief. While a debate went on between the Signal Service and Congress over whether the forecasting of weather conditions should be handled by civilian agencies or the Signal Service's existing forecast office, a Congressional committee was formed to oversee the matter, recommending that the office's operations be transferred to the Department of War following a two-year investigation.<sup id="cite_ref-stormwarning1_13-0" class="reference"><a href="#cite_note-stormwarning1-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p><p>The agency first became a civilian enterprise in 1890, when it became part of the <a href="/wiki/United_States_Department_of_Agriculture" title="United States Department of Agriculture">Department of Agriculture</a>. Under the oversight of that branch, the Bureau began issuing flood warnings and fire weather forecasts, and issued the first daily national surface weather maps; it also established a network to distribute warnings for <a href="/wiki/Tropical_cyclone" title="Tropical cyclone">tropical cyclones</a> as well as a data exchange service that relayed European weather analysis to the Bureau and vice versa.<sup id="cite_ref-stormwarning2_14-0" class="reference"><a href="#cite_note-stormwarning2-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="20th_century">20th century</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=3" title="Edit section: 20th century"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The first Weather Bureau <a href="/wiki/Radiosonde" title="Radiosonde">radiosonde</a> was launched in <a href="/wiki/Massachusetts" title="Massachusetts">Massachusetts</a> in 1937, which prompted a switch from routine aircraft observation to radiosondes within two years. The Bureau prohibited the word "<a href="/wiki/Tornado" title="Tornado">tornado</a>" from being used in any of its weather products out of concern for inciting panic (a move contradicted in its intentions by the high death tolls in past tornado outbreaks due to the lack of advanced warning) until 1938, when it began disseminating tornado warnings exclusively to <a href="/wiki/Emergency_management" title="Emergency management">emergency management</a> personnel.<sup id="cite_ref-stormwarning3_15-0" class="reference"><a href="#cite_note-stormwarning3-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p><p>The Bureau would in 1940 be moved to the <a href="/wiki/United_States_Department_of_Commerce" title="United States Department of Commerce">Department of Commerce</a>.<sup id="cite_ref-AviationWS_16-0" class="reference"><a href="#cite_note-AviationWS-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> In 1941, Margaret Smagorinsky (née Knoepfel) was hired as the Weather Bureau's first female statistician.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> On July 12, 1950, Bureau chief <a href="/wiki/Francis_Reichelderfer" title="Francis Reichelderfer">Francis W. Reichelderfer</a> officially lifted the agency's ban on public tornado alerts in a Circular Letter, noting to all first order stations that "Weather Bureau employees should avoid statements that can be interpreted as a negation of the Bureau's willingness or ability to make tornado forecasts", and that a "good probability of verification" exist when issuing such forecasts due to the difficulty in accurately predicting tornadic activity.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> However, it would not be until it faced criticism for continuing to refuse to provide public tornado warnings and preventing the release of the <a href="/wiki/United_States_Air_Force" title="United States Air Force">USAF</a> Severe Weather Warning Center's tornado forecasts (pioneered in 1948 by Air Force Capt. <a href="/wiki/Robert_C._Miller" title="Robert C. Miller">Robert C. Miller</a> and Major Ernest Fawbush) beyond military personnel that the Bureau issued its first experimental public tornado forecasts in March 1952.<sup id="cite_ref-stormwarning3_15-1" class="reference"><a href="#cite_note-stormwarning3-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> In 1957, the Bureau began using <a href="/wiki/Radar" title="Radar">radars</a> for short-term forecasting of local storms and hydrological events, using modified versions of those used by <a href="/wiki/United_States_Navy" title="United States Navy">Navy</a> aircraft to create the <a href="/wiki/WSR-57" title="WSR-57">WSR-57</a> (<u>W</u>eather <u>S</u>urveillance <u>R</u>adar, 19<u>57</u>), with a network of WSR systems being deployed nationwide through the early 1960s;<sup id="cite_ref-stormwarning4_20-0" class="reference"><a href="#cite_note-stormwarning4-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> some of the radars were upgraded to <a href="/wiki/WSR-74" title="WSR-74">WSR-74</a> models beginning in 1974.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p><p>In August 1966, the Weather Bureau became part of the <a href="/wiki/Environmental_Science_Services_Administration" title="Environmental Science Services Administration">Environmental Science Services Administration</a> when that agency was formed. The Environmental Science Services Administration was renamed the <a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a> (NOAA) on October 1, 1970, with the enactment of the <a href="/wiki/National_Environmental_Policy_Act" title="National Environmental Policy Act">National Environmental Policy Act</a>. At this time, the Weather Bureau became the National Weather Service.<sup id="cite_ref-nwshistory1_10-1" class="reference"><a href="#cite_note-nwshistory1-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> At the beginning of the 1980s the NWS used the same radar equipment as in the 1950s, and <a href="/wiki/Teletype" class="mw-redirect" title="Teletype">teletype</a> for communication. In 1983, NOAA administrator <a href="/wiki/John_V._Byrne" title="John V. Byrne">John V. Byrne</a> proposed to auction off all of the weather satellites, to repurchase data from private buyers, outsourcing weather observation stations, NOAA Weather Radio and computerized surface analysis to private companies but the proposal failed in a Congressional vote.<sup id="cite_ref-autogenerated1_22-0" class="reference"><a href="#cite_note-autogenerated1-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/NEXRAD" title="NEXRAD">NEXRAD</a> (Next Generation Radar), a system of <a href="/wiki/Pulse-Doppler_radar" title="Pulse-Doppler radar">Doppler radars</a> deployed to improve the detection and warning time of severe local storms, replaced the WSR-57 and WSR-74 systems between 1988 and 1997.<sup id="cite_ref-wsr-88d_23-0" class="reference"><a href="#cite_note-wsr-88d-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-stormwarning5_24-0" class="reference"><a href="#cite_note-stormwarning5-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Forecast_sub-organizations">Forecast sub-organizations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=4" title="Edit section: Forecast sub-organizations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:NDFD-sample-max-temp.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/NDFD-sample-max-temp.png/200px-NDFD-sample-max-temp.png" decoding="async" width="200" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/NDFD-sample-max-temp.png/300px-NDFD-sample-max-temp.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a4/NDFD-sample-max-temp.png/400px-NDFD-sample-max-temp.png 2x" data-file-width="515" data-file-height="424" /></a><figcaption>Sample maximum temperature map from the NDFD.</figcaption></figure> <p>The NWS, through a variety of sub-organizations, issues different forecasts to users, including the general public. Although, throughout history, text forecasts have been the means of product dissemination, the NWS has been using more forecast products of a digital, gridded, image or other modern format.<sup id="cite_ref-NWSstratplan_25-0" class="reference"><a href="#cite_note-NWSstratplan-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Each of the <a href="/wiki/List_of_National_Weather_Service_Weather_Forecast_Offices" class="mw-redirect" title="List of National Weather Service Weather Forecast Offices">122 Weather Forecast Offices (WFOs)</a> send their graphical forecasts to a national server to be compiled in the National Digital Forecast Database (NDFD).<sup id="cite_ref-NDFDhome_26-0" class="reference"><a href="#cite_note-NDFDhome-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> The NDFD is a collection of common weather observations used by organizations and the public, including precipitation amount, temperature, and cloud cover among other parameters. In addition to viewing gridded weather data via the internet, users can download and use the individual grids using a "GRIB2 decoder" which can output data as <a href="/wiki/Shapefile" title="Shapefile">shapefiles</a>, <a href="/wiki/NetCDF" title="NetCDF">netCDF</a>, <a href="/wiki/GrADS" title="GrADS">GrADS</a>, float files, and comma-separated value files.<sup id="cite_ref-NDFDtech_27-0" class="reference"><a href="#cite_note-NDFDtech-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> Specific points in the digital database can be accessed using an <a href="/wiki/XML" title="XML">XML</a> SOAP service. </p> <div class="mw-heading mw-heading3"><h3 id="Fire_weather">Fire weather</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=5" title="Edit section: Fire weather"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Wildfire" title="Wildfire">Wildfire</a></div> <p>The National Weather Service issues many products relating to wildfires daily. For example, a Fire Weather Forecast, which have a forecast period covering up to seven days, is issued by local WFOs daily, with updates as needed. The forecasts contain weather information relevant to fire control and smoke management for the next 12 to 48 hours, such as wind direction and speed, and precipitation. The appropriate crews use this information to plan for staffing and equipment levels, the ability to conduct scheduled controlled burns, and assess the daily fire danger. Once per day, NWS meteorologists issue a coded fire weather forecast for specific <a href="/wiki/United_States_Forest_Service" title="United States Forest Service">United States Forest Service</a> observation sites that are then input into the <a href="/wiki/National_Fire_Danger_Rating_System" title="National Fire Danger Rating System">National Fire Danger Rating System</a> (NFDRS). This computer model outputs the daily fire danger that is then conveyed to the public in one of five ratings: low, moderate, high, very high, or extreme.<sup id="cite_ref-nfdrs_28-0" class="reference"><a href="#cite_note-nfdrs-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p><p>The local Weather Forecast Offices of the NWS also, under a prescribed set of criteria, issue Fire Weather Watches and <a href="/wiki/Red_Flag_Warning" class="mw-redirect" title="Red Flag Warning">Red Flag Warnings</a> as needed, in addition to issuing the daily fire weather forecasts for the local service area. These products alert the public and other agencies to conditions which create the potential for extreme fires. On the national level, the NWS <a href="/wiki/Storm_Prediction_Center" title="Storm Prediction Center">Storm Prediction Center</a> issues fire weather analyses for days one and two of the forecast period that provide supportive information to the local WFO forecasts regarding particular critical elements of fire weather conditions. These include large-scale areas that may experience critical fire weather conditions including the occurrence of "dry thunderstorms", which usually occur in the <a href="/wiki/Western_United_States" title="Western United States">western U.S.</a>, and are not accompanied by any rain due to it <a href="/wiki/Virga" title="Virga">evaporating before reaching the surface</a>.<sup id="cite_ref-spcfire_29-0" class="reference"><a href="#cite_note-spcfire-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:NWS-IMET-deployed.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/NWS-IMET-deployed.jpg/150px-NWS-IMET-deployed.jpg" decoding="async" width="150" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/NWS-IMET-deployed.jpg/225px-NWS-IMET-deployed.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/6/61/NWS-IMET-deployed.jpg 2x" data-file-width="250" data-file-height="375" /></a><figcaption>NWS IMET Chris Gibson taking observations in the field.</figcaption></figure> <p>State and federal forestry officials sometimes request a forecast from a WFO for a specific location called a "spot forecast", which are used to determine whether it will be safe to ignite a <a href="/wiki/Prescribed_burn" class="mw-redirect" title="Prescribed burn">prescribed burn</a> and how to situate crews during the controlling phase. Officials send in a request, usually during the early morning, containing the position coordinates of the proposed burn, the ignition time, and other pertinent information. The WFO composes a short-term fire weather forecast for the location and sends it back to the officials, usually within an hour of receiving the request.<sup id="cite_ref-spcfire_29-1" class="reference"><a href="#cite_note-spcfire-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p><p>The NWS assists officials at the scene of large wildfires or other disasters, including <a href="/wiki/HAZMAT" class="mw-redirect" title="HAZMAT">HAZMAT</a> incidents, by providing on-site support through Incident Meteorologists (IMET).<sup id="cite_ref-flagstaffincident_30-0" class="reference"><a href="#cite_note-flagstaffincident-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> IMETs are NWS forecasters specially trained to work with Incident Management Teams during severe wildfire outbreaks or other disasters requiring on-site weather support. IMETs travel quickly to the incident site and then assemble a mobile weather center capable of providing continuous meteorological support for the duration of the incident. The kit includes a <a href="/wiki/Cellular_phone" class="mw-redirect" title="Cellular phone">cell phone</a>, a <a href="/wiki/Laptop_computer" class="mw-redirect" title="Laptop computer">laptop computer</a>, and communications equipment, used for gathering and displaying weather data such as satellite imagery or numerical forecast model output. Remote weather stations are also used to gather specific data for the point of interest,<sup id="cite_ref-flagstaffincident_30-1" class="reference"><a href="#cite_note-flagstaffincident-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> and often receive direct support from the local WFO during such crises. IMETs, approximately 70 to 80 of which are employed nationally, can be deployed anywhere a disaster strikes and must be capable of working long hours for weeks at a time in remote locations under rough conditions.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Weather_Forecast_Offices">Weather Forecast Offices</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=6" title="Edit section: Weather Forecast Offices"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/List_of_National_Weather_Service_Weather_Forecast_Offices" class="mw-redirect" title="List of National Weather Service Weather Forecast Offices">List of National Weather Service Weather Forecast Offices</a></div> <figure class="mw-default-size mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:NWS_Weather_Forecast_Offices.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/NWS_Weather_Forecast_Offices.svg/660px-NWS_Weather_Forecast_Offices.svg.png" decoding="async" width="660" height="414" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/NWS_Weather_Forecast_Offices.svg/990px-NWS_Weather_Forecast_Offices.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/05/NWS_Weather_Forecast_Offices.svg/1320px-NWS_Weather_Forecast_Offices.svg.png 2x" data-file-width="512" data-file-height="321" /></a><figcaption>Map of NWS Weather Forecast Offices. Colors indicate area of responsibility, letters indicate each office's call sign. Alaska, Pacific and Puerto Rico offices are only indicated with call sign letters in the corners.</figcaption></figure> <p>The National Weather Service is divided into 122 local branches, known as Weather Forecast Offices (WFOs), to issue products specific to those areas. The NWS is divided into six regions. Each WFO maintains a specific area of responsibility spanning multiple counties, parishes or other jurisdictions within the United States – which, in some areas, cover multiple states – or individual possessions; the local offices handle responsibility of composing and disseminating forecasts and weather alerts to areas within their region of service. Some of the products that are only issued by the WFOs are <a href="/wiki/Severe_thunderstorm_warning" title="Severe thunderstorm warning">severe thunderstorm</a> and <a href="/wiki/Tornado_Warning" class="mw-redirect" title="Tornado Warning">tornado</a> warnings, flood, <a href="/wiki/Flash_flood_warning" title="Flash flood warning">flash flood</a>, and winter weather watches and warnings, some aviation products, and local forecast grids. The forecasts issued by a WFO are available on their individual pages within the Weather.gov website, which can be accessed through either forecast landing pages (which identify the office that disseminates the weather data) or via the alert map featured on the main page of the National Weather Service website. </p> <div style="clear:left;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="National_Centers_for_Environmental_Prediction">National Centers for Environmental Prediction</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=7" title="Edit section: National Centers for Environmental Prediction"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/National_Centers_for_Environmental_Prediction" title="National Centers for Environmental Prediction">National Centers for Environmental Prediction</a></div> <div class="mw-heading mw-heading4"><h4 id="Aviation">Aviation</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=8" title="Edit section: Aviation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/78/Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg/220px-Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg" decoding="async" width="220" height="163" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/78/Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg/330px-Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/78/Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg/440px-Wea01302_-_Flickr_-_NOAA_Photo_Library.jpg 2x" data-file-width="1600" data-file-height="1184" /></a><figcaption>Meteorologists preparing a forecast, early 20th century.</figcaption></figure> <p>The NWS supports the aviation community through the production of several forecasts. Each area's WFO has responsibility for the issuance of <a href="/wiki/Terminal_Aerodrome_Forecast" class="mw-redirect" title="Terminal Aerodrome Forecast">Terminal Aerodrome Forecasts</a> (TAFs) for <a href="/wiki/Airport" title="Airport">airports</a> in their jurisdiction.<sup id="cite_ref-aviationweather.gov_32-0" class="reference"><a href="#cite_note-aviationweather.gov-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> TAFs are concise, coded 24-hour forecasts (30-hour forecasts for certain airports) for a specific airport, which are issued every six hours with amendments as needed. As opposed to a public weather forecast, a TAF only addresses weather elements critical to aviation; these include wind, <a href="/wiki/Visibility" title="Visibility">visibility</a>, <a href="/wiki/Cloud" title="Cloud">cloud cover</a> and <a href="/wiki/Wind_shear" title="Wind shear">wind shear</a>. </p><p>Twenty-one NWS Center Weather Service Units (CWSU) are collocated with the <a href="/wiki/Federal_Aviation_Administration" title="Federal Aviation Administration">Federal Aviation Administration (FAA)</a> <a href="/wiki/Area_Control_Center" class="mw-redirect" title="Area Control Center">Air Route Traffic Control Centers (ARTCC)</a>. Their main responsibility is to provide up-to-the-minute weather information and briefings to the Traffic Management Units and control room supervisors. Special emphasis is given to weather conditions that could be hazardous to aviation or impede the flow of air traffic in the <a href="/wiki/National_Airspace_System" title="National Airspace System">National Airspace System</a>. Besides scheduled and unscheduled briefings for decision-makers in the ARTCC and other FAA facilities, CWSU meteorologists also issue two unscheduled products. The Center Weather Advisory (CWA) is an aviation weather warning for thunderstorms, icing, turbulence, and low <a href="/wiki/Ceiling_(cloud)" title="Ceiling (cloud)">cloud ceilings</a> and visibilities. The Meteorological Impact Statement (MIS) is a two- to 12-hour forecast that outlines weather conditions expected to impact ARTCC operations.<sup id="cite_ref-awccwsus_33-0" class="reference"><a href="#cite_note-awccwsus-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> </p><p>The Aviation Weather Center (AWC), located in <a href="/wiki/Kansas_City,_Missouri" title="Kansas City, Missouri">Kansas City, Missouri</a>, is a central aviation support facility operated by the National Weather Service, which issues two primary products: </p> <ul><li><a href="/wiki/AIRMET" title="AIRMET">AIRMET</a> (Airmen's Meteorological Information) – Information on <a href="/wiki/Icing_conditions" class="mw-redirect" title="Icing conditions">icing</a>, <a href="/wiki/Turbulence" title="Turbulence">turbulence</a>, mountain obscuration, low-level wind shear, <a href="/wiki/Instrument_meteorological_conditions" title="Instrument meteorological conditions">instrument meteorological conditions</a>, and strong surface winds.</li> <li><a href="/wiki/SIGMET" title="SIGMET">SIGMETs</a> (Significant Meteorological Information) – Issued for significant weather that may affect an airport of flight path in an area: <ul><li>Convective – Issued for an area of thunderstorms affecting an area of 3,000 square miles (7,800 km<sup>2</sup>) or greater, a line of thunderstorms at least 60 nmi (110 km) long, or severe or embedded thunderstorms affecting any area that are expected to last 30 minutes or longer.</li> <li>Non-convective – Issued for severe turbulence over a 3,000 square miles (7,800 km<sup>2</sup>) area, severe icing over a 3,000 square miles (7,800 km<sup>2</sup>), or instrument meteorological conditions over a 3,000 square miles (7,800 km<sup>2</sup>) area due to dust, sand, or volcanic ash.</li></ul></li></ul> <div class="mw-heading mw-heading4"><h4 id="Storm_Prediction_Center">Storm Prediction Center</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=9" title="Edit section: Storm Prediction Center"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Storm_Prediction_Center" title="Storm Prediction Center">Storm Prediction Center</a></div> <p>The Storm Prediction Center (SPC) in <a href="/wiki/Norman,_Oklahoma" title="Norman, Oklahoma">Norman, Oklahoma</a> issues severe thunderstorm and tornado watches in cooperation with local WFOs which are responsible for delineating jurisdictions affected by the issued watch, and SPC also issues mesoscale discussions focused upon possible convective activity. SPC compiles reports of severe hail, wind, or tornadoes issued by local WFOs each day when thunderstorms producing such phenomena occur in a given area, and formats the data into text and graphical products. It also provides forecasts on convective activity through day eight of the forecast period (most prominently, the threat of severe thunderstorms, the risk of which is assessed through a tiered system conveyed among six categories – general thunderstorms, marginal, slight, enhanced, moderate, or high – based mainly on the expected number of storm reports and regional coverage of thunderstorm activity over a given forecast day), and is responsible for issuing fire weather outlooks, which support local WFOs in the determination of the need for Red Flag Warnings. </p> <div class="mw-heading mw-heading4"><h4 id="Weather_Prediction_Center">Weather Prediction Center</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=10" title="Edit section: Weather Prediction Center"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Weather_Prediction_Center" title="Weather Prediction Center">Weather Prediction Center</a></div> <p>The <a href="/wiki/Weather_Prediction_Center" title="Weather Prediction Center">Weather Prediction Center</a> in <a href="/wiki/College_Park,_Maryland" title="College Park, Maryland">College Park, Maryland</a> provides guidance for future precipitation amounts and areas where excessive rainfall is likely,<sup id="cite_ref-AboutHPC_34-0" class="reference"><a href="#cite_note-AboutHPC-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> while local NWS offices are responsible for issuing Flood Watches, Flash Flood Watches, Flood Warnings, Flash Flood Warnings, and Flood Advisories for their local County Warning Area, as well as the official rainfall forecast for areas within their warning area of responsibility. These products can and do emphasize different hydrologic issues depending on geographic area, land use, time of year, as well as other meteorological and non-meteorological factors (for example, during the early spring or late winter a Flood Warning can be issued for an <a href="/wiki/Ice_jam" title="Ice jam">ice jam</a> that occurs on a river, while in the summer a Flood Warning will most likely be issued for excessive rainfall). </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:2008-06-14_NOAA_flooding_overview.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/2008-06-14_NOAA_flooding_overview.png/220px-2008-06-14_NOAA_flooding_overview.png" decoding="async" width="220" height="154" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/2008-06-14_NOAA_flooding_overview.png/330px-2008-06-14_NOAA_flooding_overview.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/57/2008-06-14_NOAA_flooding_overview.png/440px-2008-06-14_NOAA_flooding_overview.png 2x" data-file-width="531" data-file-height="371" /></a><figcaption>National AHPS map.</figcaption></figure> <p>In recent years, the NWS has enhanced its dissemination of hydrologic information through the Advanced Hydrologic Prediction Service (AHPS).<sup id="cite_ref-AHPShome_35-0" class="reference"><a href="#cite_note-AHPShome-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> The AHPS allows anyone to view near real-time observation and forecast data for rivers, lakes and streams. The service also enables the NWS to provide long-range probabilistic information which can be used for long-range planning decisions. </p> <div class="mw-heading mw-heading4"><h4 id="River_Forecast_Centers">River Forecast Centers</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=11" title="Edit section: River Forecast Centers"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Daily river forecasts are issued by the thirteen River Forecast Centers (RFCs) using hydrologic models based on rainfall, soil characteristics, precipitation forecasts, and several other variables. The first such center was founded on September 23, 1946.<sup id="cite_ref-ERHhist_36-0" class="reference"><a href="#cite_note-ERHhist-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> Some RFCs, especially those in mountainous regions, also provide seasonal snow pack and peak flow forecasts. These forecasts are used by a wide range of users, including those in <a href="/wiki/Agriculture" title="Agriculture">agriculture</a>, <a href="/wiki/Hydroelectricity" title="Hydroelectricity">hydroelectric dam</a> operation, and <a href="/wiki/Water_resources" title="Water resources">water supply</a> resources. </p> <div class="mw-heading mw-heading4"><h4 id="Ocean_Prediction_Center">Ocean Prediction Center</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=12" title="Edit section: Ocean Prediction Center"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:NWSmarinezones.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/NWSmarinezones.gif/220px-NWSmarinezones.gif" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ab/NWSmarinezones.gif/330px-NWSmarinezones.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ab/NWSmarinezones.gif/440px-NWSmarinezones.gif 2x" data-file-width="1095" data-file-height="619" /></a><figcaption>The National Weather Service areas of marine weather forecasting responsibility.</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Ocean_Prediction_Center" title="Ocean Prediction Center">Ocean Prediction Center</a></div> <p>The National Weather Service <a href="/wiki/Ocean_Prediction_Center" title="Ocean Prediction Center">Ocean Prediction Center</a> (OPC) in <a href="/wiki/College_Park,_Maryland" title="College Park, Maryland">College Park, Maryland</a><sup id="cite_ref-OPChome_37-0" class="reference"><a href="#cite_note-OPChome-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> issues <a href="/wiki/Marine_weather_forecasting" title="Marine weather forecasting">marine products</a> for areas that are within the national waters of the United States. NWS national centers or Weather Forecast Offices issue several marine products: </p> <ul><li>Coastal Waters Forecast (CWF) – a text product issued by all coastal WFOs to explicitly state expected weather conditions within their marine forecast area of responsibility through day five; it also addresses expected wave heights.</li> <li>Offshore Waters Forecast (OFF) – a text product issued by the OPC that provides forecast and warning information to mariners who travel on the oceanic waters adjacent to the U.S. coastal waters through day five.</li> <li>NAVTEX forecast – a text forecast issued by the OPC (combining data from the Coastal Waters and Offshore Waters Forecasts) designed to accommodate broadcast restrictions of <a href="/wiki/United_States_Coast_Guard" title="United States Coast Guard">U.S. Coast Guard</a> <a href="/wiki/NAVTEX" title="NAVTEX">NAVTEX</a> transmitters.</li> <li>High Seas Forecast (HSF) – routine text product issued every six hours by OPC to provide warning and forecast information to mariners who travel on the oceanic waters.</li></ul> <div class="mw-heading mw-heading4"><h4 id="National_Hurricane_Center">National Hurricane Center</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=13" title="Edit section: National Hurricane Center"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/National_Hurricane_Center" title="National Hurricane Center">National Hurricane Center</a></div> <p>The <a href="/wiki/National_Hurricane_Center" title="National Hurricane Center">National Hurricane Center</a> (NHC) and the <a href="/wiki/Central_Pacific_Hurricane_Center" title="Central Pacific Hurricane Center">Central Pacific Hurricane Center</a> (CPHC), respectively based in <a href="/wiki/Miami,_Florida" class="mw-redirect" title="Miami, Florida">Miami, Florida</a> and <a href="/wiki/Honolulu,_Hawaii" class="mw-redirect" title="Honolulu, Hawaii">Honolulu, Hawaii</a>, are responsible for monitoring tropical weather in the <a href="/wiki/Atlantic_Ocean" title="Atlantic Ocean">Atlantic</a>, and central and eastern <a href="/wiki/Pacific_Ocean" title="Pacific Ocean">Pacific Oceans</a>. In addition to releasing routine outlooks and discussions, the guidance center initiates advisories and discussions on individual tropical cyclones, as needed. If a tropical cyclone threatens the United States or its territories, individual WFOs begin issuing statements detailing the expected effects within their local area of responsibility. The NHC and CPHC issue products including tropical cyclone advisories, forecasts, and formation predictions, and warnings for the areas in the Atlantic and parts of the Pacific. </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:NOAA-CPC-seasonal-temp-outlook.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/NOAA-CPC-seasonal-temp-outlook.gif/125px-NOAA-CPC-seasonal-temp-outlook.gif" decoding="async" width="125" height="116" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/NOAA-CPC-seasonal-temp-outlook.gif/188px-NOAA-CPC-seasonal-temp-outlook.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9e/NOAA-CPC-seasonal-temp-outlook.gif/250px-NOAA-CPC-seasonal-temp-outlook.gif 2x" data-file-width="719" data-file-height="668" /></a><figcaption>Sample CPC 3.5-month temperature outlook.</figcaption></figure> <div class="mw-heading mw-heading4"><h4 id="Climate_Prediction_Center">Climate Prediction Center</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=14" title="Edit section: Climate Prediction Center"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Climate_Prediction_Center" title="Climate Prediction Center">Climate Prediction Center</a></div> <p>The <a href="/wiki/Climate_Prediction_Center" title="Climate Prediction Center">Climate Prediction Center</a> (CPC) in <a href="/wiki/College_Park,_Maryland" title="College Park, Maryland">College Park, Maryland</a> is responsible for all of the NWS's climate-related forecasts. Their mission is to "serve the public by assessing and forecasting the impacts of short-term climate variability, emphasizing enhanced risks of weather-related extreme events, for use in mitigating losses and maximizing economic gains." Their products cover time scales from a week to seasons, extending into the future as far as technically feasible, and cover the land, the ocean and the atmosphere, extending into the stratosphere. Most of the products issued by the center cover the <a href="/wiki/Contiguous_United_States" title="Contiguous United States">Contiguous U.S.</a> and <a href="/wiki/Alaska" title="Alaska">Alaska</a>. </p><p>Additionally, Weather Forecast Offices issue daily and monthly climate reports for official climate stations within their area of responsibility. These generally include recorded highs, lows and other information (including historical temperature extremes, fifty-year temperature and precipitation averages, and <a href="/wiki/Degree_day" title="Degree day">degree days</a>). This information is considered preliminary until certified by the <a href="/wiki/National_Climatic_Data_Center" title="National Climatic Data Center">National Climatic Data Center</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Data_acquisition">Data acquisition</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=15" title="Edit section: Data acquisition"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Surface_observations">Surface observations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=16" title="Edit section: Surface observations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg/220px-2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg" decoding="async" width="220" height="164" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg/330px-2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/19/2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg/440px-2008-07-01_Elko_ASOS_viewed_from_the_south_cropped.jpg 2x" data-file-width="2204" data-file-height="1638" /></a><figcaption>An Automated Surface Observing System (ASOS).</figcaption></figure> <p>The primary network of surface weather observation stations in the United States is composed of <a href="/wiki/Automated_airport_weather_station#Automated_Surface_Observing_System_(ASOS)" title="Automated airport weather station">Automated Surface Observing Systems</a> (ASOS). The ASOS program is a joint effort of the National Weather Service (NWS), automatic weather station(AWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD).<sup id="cite_ref-asoshome_38-0" class="reference"><a href="#cite_note-asoshome-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> ASOS stations are designed to support weather forecast activities and aviation operations and, at the same time, support the needs of the meteorological, hydrological, and climatological research communities. ASOS was especially designed for the safety of the aviation community, therefore the sites are almost always located near airport runways. The system transmits routine hourly observations along with special observations when conditions exceed aviation weather thresholds (e.g. conditions change from <a href="/wiki/Visual_meteorological_conditions" title="Visual meteorological conditions">visual meteorological conditions</a> to <a href="/wiki/Instrument_meteorological_conditions" title="Instrument meteorological conditions">instrument meteorological conditions</a>). The basic weather elements observed are: sky condition, visibility, present weather, obstructions to vision, pressure, temperature, <a href="/wiki/Dew_point" title="Dew point">dew point</a>, wind direction and speed, precipitation accumulation, and selected significant remarks. The coded observations are issued as <a href="/wiki/METAR" title="METAR">METARs</a> and look similar to this: </p> <pre>METAR KNXX 121155Z 03018G29KT 1/4SM +TSSN FG VV002 M05/M07 A2957 RMK PK WND 01029/1143 SLP026 SNINCR 2/10 RCRNR T2 SET 6///// 7//// 4/010 T10561067 11022 21056 55001 PWINO PNO FZRANO </pre> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3a/2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG/220px-2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3a/2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG/330px-2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3a/2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG/440px-2013-10-14_12_33_44_National_Weather_Service_Cooperative_Observer_site.JPG 2x" data-file-width="3264" data-file-height="2448" /></a><figcaption>A Cooperative Observer Program weather station.</figcaption></figure> <p>Getting more information on the atmosphere, more frequently, and from more locations is the key to improving forecasts and warnings. Due to the large installation and operating costs associated with ASOS, the stations are widely spaced. Therefore, the <b><a href="/wiki/Cooperative_Observer" class="mw-redirect" title="Cooperative Observer">Cooperative Observer</a> Program (COOP)</b>, a network of approximately 11,000 mostly volunteer weather observers, provides much of the meteorological and climatological data to the country. The program, which was established in 1890 under the Organic Act, currently has a twofold mission: </p> <ul><li>Provide observational meteorological data, usually consisting of daily maximum and minimum temperatures, snowfall, and 24-hour precipitation totals, required to define the climate of the United States and to help measure long-term climate changes.</li> <li>Provide observational meteorological data in near real-time to support forecast, warning and other public service programs of the NWS.</li></ul> <p>The National Weather Service also maintains connections with privately operated <a href="/wiki/Mesonet" title="Mesonet">mesonets</a> such as the <a href="/wiki/Citizen_Weather_Observer_Program" title="Citizen Weather Observer Program">Citizen Weather Observer Program</a> for data collection, in part, through the <a href="/wiki/Citizen_Weather_Observer_Program#MADIS" title="Citizen Weather Observer Program">Meteorological Assimilated Data Ingest System</a> (MADIS). Funding is also provided to the <a href="/wiki/Community_Collaborative_Rain,_Hail_and_Snow_Network" title="Community Collaborative Rain, Hail and Snow Network">CoCoRaHS</a> volunteer weather observer network through parent agency NOAA. </p> <div class="mw-heading mw-heading3"><h3 id="Marine_observations">Marine observations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=17" title="Edit section: Marine observations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Weather_buoy" title="Weather buoy">Weather buoy</a> and <a href="/wiki/Weather_ship" title="Weather ship">Weather ship</a></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:NOAA-NDBC-discus-buoy.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/NOAA-NDBC-discus-buoy.jpg/135px-NOAA-NDBC-discus-buoy.jpg" decoding="async" width="135" height="159" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/NOAA-NDBC-discus-buoy.jpg/203px-NOAA-NDBC-discus-buoy.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0c/NOAA-NDBC-discus-buoy.jpg/270px-NOAA-NDBC-discus-buoy.jpg 2x" data-file-width="389" data-file-height="458" /></a><figcaption>3-metre (9.8 ft) discus buoy located off the Southeast U.S. coast.</figcaption></figure> <p>NWS forecasters need frequent, high-quality marine observations to examine conditions for forecast preparation and to verify their forecasts after they are produced. These observations are especially critical to the output of <a href="/wiki/Numerical_weather_prediction" title="Numerical weather prediction">numerical weather models</a> because large bodies of water have a profound impact on the weather. Other users rely on the observations and forecasts for commercial and recreational activities. To help meet these needs, the NWS's <a href="/wiki/National_Data_Buoy_Center" title="National Data Buoy Center">National Data Buoy Center</a> (NDBC) in <a href="/wiki/Hancock_County,_Mississippi" title="Hancock County, Mississippi">Hancock County, Mississippi</a> operates a network of about 90 buoys and 60 land-based coastal observing systems (C-MAN). The stations measure wind speed, direction, and gust; barometric pressure; and air temperature. In addition, all buoy and some C-MAN stations measure <a href="/wiki/Sea_surface_temperature" title="Sea surface temperature">sea surface temperature</a>, and wave height and period.<sup id="cite_ref-NDBCmr_39-0" class="reference"><a href="#cite_note-NDBCmr-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Conductivity and water current are measured at selected stations. All stations report on an hourly basis. </p><p>Supplemental weather observations are acquired through the <b>United States Voluntary Observing Ship (VOS)</b> program.<sup id="cite_ref-NDBC_40-0" class="reference"><a href="#cite_note-NDBC-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> It is organized for the purpose of obtaining weather and oceanographic observations from transiting ships. An international program under <a href="/wiki/World_Meteorological_Organization" title="World Meteorological Organization">World Meteorological Organization</a> (WMO) marine auspices, the VOS has 49 countries as participants. The United States program is the largest in the world, with nearly 1,000 vessels. Observations are taken by deck officers, coded in a special format known as the "ships synoptic code", and transmitted in real-time to the NWS. They are then distributed on national and international circuits for use by meteorologists in weather forecasting, by oceanographers, ship routing services, fishermen, and many others. The observations are then forwarded for use by the National Climatic Data Center (NCDC) in <a href="/wiki/Asheville,_North_Carolina" title="Asheville, North Carolina">Asheville, North Carolina</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Upper_air_observations">Upper air observations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=18" title="Edit section: Upper air observations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Radiosonde-wx-balloon.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Radiosonde-wx-balloon.jpg/110px-Radiosonde-wx-balloon.jpg" decoding="async" width="110" height="157" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Radiosonde-wx-balloon.jpg/165px-Radiosonde-wx-balloon.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Radiosonde-wx-balloon.jpg/220px-Radiosonde-wx-balloon.jpg 2x" data-file-width="340" data-file-height="485" /></a><figcaption>A radiosonde shortly after launch.</figcaption></figure> <p>Upper air weather data is essential for weather forecasting and research. The NWS operates 92 <a href="/wiki/Radiosonde" title="Radiosonde">radiosonde</a> locations in <a href="/wiki/North_America" title="North America">North America</a> and ten sites in <a href="/wiki/The_Caribbean" class="mw-redirect" title="The Caribbean">the Caribbean</a>. A small, expendable instrument package is suspended below a 2 metres (6.6 ft) wide balloon filled with <a href="/wiki/Hydrogen" title="Hydrogen">hydrogen</a> or <a href="/wiki/Helium" title="Helium">helium</a>, then released daily at or shortly after 1100 and 2300 <a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">UTC</a>, respectively. As the radiosonde rises at about 300 meters/minute (1,000 ft/min), sensors on the radiosonde measure profiles of pressure, temperature, and relative humidity. These sensors are linked to a battery-powered radio transmitter that sends the sensor measurements to a ground receiver. By tracking the position of the radiosonde in flight, information on wind speed and direction aloft is also obtained. The flight can last longer than two hours, and during this time the radiosonde can ascend above 35 km (115,000 ft) and drift more than 200 km (120 mi) from the release point. When the balloon has expanded beyond its elastic limit and bursts (about 6 m or 20 ft in diameter), a small parachute slows the descent of the radiosonde, minimizing the danger to lives and property. Data obtained during the flights is coded and disseminated, at which point it can be plotted on a <a href="/wiki/Skew-T_log-P_diagram" title="Skew-T log-P diagram">Skew-T</a> or Stuve diagram for analysis. In recent years, the National Weather Service has begun incorporating data from <a href="/wiki/AMDAR" class="mw-redirect" title="AMDAR">AMDAR</a> in its numerical models (however, the raw data is not available to the public). </p> <div class="mw-heading mw-heading2"><h2 id="Event-driven_products">Event-driven products</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=19" title="Edit section: Event-driven products"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Severe_weather_terminology_(United_States)" title="Severe weather terminology (United States)">Severe weather terminology (United States)</a></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Valid_Time_Event_Code" title="Valid Time Event Code">Valid Time Event Code</a></div> <p>The National Weather Service has developed a multi-tier concept for forecasting or alerting the public to all types of hazardous weather: </p> <ul><li><b>Outlook</b> – Hazardous Weather Outlooks are issued daily by individual Weather Forecast Offices to address potentially hazardous weather or hydrologic events that may occur over the next seven days. The outlook will include information about the potential of convective thunderstorm activity (including the potential for severe thunderstorms), heavy rain or <a href="/wiki/Flood" title="Flood">flooding</a>, winter weather, and extremes of heat or cold. It is intended to provide information to those who need considerable lead time to prepare for the event, including notification to storm spotter groups and local <a href="/wiki/Emergency_management" title="Emergency management">emergency management</a> agencies on the recommendation of activation during severe weather situations in areas prone to such events. Other outlooks are issued on an event-driven basis, such as the Flood Potential Outlook and Severe Weather Outlook.</li> <li><b>Advisory</b> – An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent, or likely. Advisories are for less serious conditions than warnings, that cause significant inconvenience and if caution is not exercised, could lead to situations that may threaten life or property.</li> <li><b>Watch</b> – A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain. It is intended to provide enough lead time so those who need to set their safety plans in motion can do so in advance if a forecasted event should occur. A watch means that hazardous weather is possible, but not imminent. People should have a plan of action in case a storm threatens and monitor various avenues that provide NOAA-disseminated data to listen for later information and possible warnings, especially when planning travel or outdoor activities.</li> <li><b>Warning</b> – A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. A warning means weather conditions pose a threat to life or property. People in the path of the storm need to take protective action.</li> <li><b>Special Weather Statement (or Significant Weather Advisory)</b> – A special weather statement is issued when something rare or unusual is occurring. These are usually triggered by sudden changes in meteorological conditions. The statements are to be taken as warnings for residents of a specific area. Significant Weather Advisories are often issued for storms not severe enough for Severe Thunderstorm Warnings, but for strong winds and small hail. The warning generally states that an area might be at risk for a slight weather danger, though not all weather statements are warnings. Other times, statements describe informative facts about a weather system (such as local snowfall).</li></ul> <div class="mw-heading mw-heading3"><h3 id="Weather_warnings_and_advisories">Weather warnings and advisories</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=20" title="Edit section: Weather warnings and advisories"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Severe_weather_terminology_(United_States)" title="Severe weather terminology (United States)">Severe weather terminology (United States)</a></div> <p>Short-fused <a href="/wiki/Weather_warning" title="Weather warning">weather warnings</a> and advisories issued by local NWS forecast offices are generally less than 500–5,000 square miles (1,300–12,900 km<sup>2</sup>) in area. Warnings for severe local storms are intended to be issued preceding the arrival of severe weather at a particular locale by one hour or less; the NWS also issues warnings and advisories for various hydrological and non-hydrological events including <a href="/wiki/Flood" title="Flood">floods</a>, non-thunderstorm high winds, <a href="/wiki/Winter_storm" title="Winter storm">winter storms</a>, intense heat or cold, fire weather and marine hazards, which vary in timepsan depending on the weather situation (<a href="/wiki/Tropical_cyclone_warnings_and_watches" title="Tropical cyclone warnings and watches">inland and coastal warnings for tropical cyclones</a> are issued by the <a href="/wiki/National_Hurricane_Center" title="National Hurricane Center">National Hurricane Center</a> (NHC), a guidance center of the National Oceanic and Atmospheric Administration). The NWS defines a warning as a "hazardous weather or hydrologic event [that] is occurring, is imminent, or has a very high probability of occurring" and an advisory as "[highlighting] special weather conditions that are less serious than a warning [...] for events that may cause significant inconvenience, and if caution is not exercised, [..] could lead to situations that may threaten life and/or property."<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> In earnest, they indicate that hazardous weather conditions are occurring that may pose a risk to life and property, and are intended to direct the general public to take immediate action and heed safety precautions; it also has the side purpose of directing emergency management personnel to be on standby in case the weather situation leads to property damage or casualties. Severe thunderstorm and flood warnings indicate that organized severe thunderstorms or flooding are occurring, whereas tornado warnings are issued if a storm is indicated to be producing an observed tornado or exhibits strong, low-level rotation.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> </p><p>The process of issuing a warning or advisory begins with observations of a hydrological or <a href="/wiki/Extreme_weather" title="Extreme weather">extreme weather</a> event that is either occurring at present (through radar imagery, reports from local television and radio stations, or ground observations by local law enforcement, civil defense officials, media outlets or storm spotters) or is forecast to occur within 12 to 24 hours. If after collaboration a warning or advisory is deemed necessary, the Weather Forecast Office will generate a bulletin product via the Advance Weather Interactive Processing System (<a href="/wiki/AWIPS" class="mw-redirect" title="AWIPS">AWIPS</a>) and then disseminate the alert through various communication routes accessed by the media and various agencies, on the internet, to <a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">NOAA</a> satellites, and on <a href="/wiki/NOAA_Weather_Radio" title="NOAA Weather Radio">NOAA Weather Radio</a>.<sup id="cite_ref-Dissemination_44-0" class="reference"><a href="#cite_note-Dissemination-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> </p><p>The product outlines the alert type, the issuing WFO, the sections of government subdivisions (<a href="/wiki/County_(United_States)" title="County (United States)">counties</a>, <a href="/wiki/Parish_(administrative_division)" title="Parish (administrative division)">parishes</a>, <a href="/wiki/Borough" title="Borough">boroughs</a> or <a href="/wiki/Independent_city_(United_States)" title="Independent city (United States)">independent cities</a>) covered by the alert, and its time of expiration (based on the local <a href="/wiki/Time_zone" title="Time zone">time zone</a>). Some products – particularly for severe thunderstorm, tornado and flood warnings – include a tag requesting <a href="/wiki/Emergency_Alert_System" title="Emergency Alert System">Emergency Alert System</a> activation to trigger public alert messages via television, radio stations, NOAA Weather Radio, and smartphone apps and messaging services. For local storm events, the warning or advisory product also outlines a meteorological summary of the most recent storm location or local storm report issued prior to the product's issuance (including the approximate area in <a href="/wiki/Statute_mile" class="mw-redirect" title="Statute mile">statute miles</a> and estimated speed and direction), associated hazards, impacts, municipalities and designated land areas (and, if applicable, highway mile markers) covered by the alert, and boilerplate action messages informing the public of safety precautions they need to take or advising them to be vigilant of any warnings or weather statements that may be issued by their local National Weather Service office. A statement may be issued as a follow-up message to a warning, watch, or emergency, which may update, extend, or cancel the previously issued product or be used as a notification of significant weather for which no type of alert is currently in effect for a given location or is expected to be in effect. </p><p>In situations where a forecaster indicates a significant threat of extremely severe and life-threatening weather with an ongoing local weather event, enhanced wording may be used to note the heightened threat by a significant local storm event. In April 2012, the NWS introduced the Impact Based Warning system at its Weather Forecast Offices in <a href="/wiki/Wichita,_Kansas" title="Wichita, Kansas">Wichita</a> and <a href="/wiki/Topeka,_Kansas" title="Topeka, Kansas">Topeka</a>, <a href="/wiki/Kansas" title="Kansas">Kansas</a>, and <a href="/wiki/Springfield,_Missouri" title="Springfield, Missouri">Springfield</a>, <a href="/wiki/St._Louis,_Missouri" class="mw-redirect" title="St. Louis, Missouri">St. Louis</a> and <a href="/wiki/Kansas_City,_Missouri" title="Kansas City, Missouri">Kansas City</a>/<a href="/wiki/Pleasant_Hill,_Missouri" title="Pleasant Hill, Missouri">Pleasant Hill</a>, <a href="/wiki/Missouri" title="Missouri">Missouri</a>; the pilot project – which would expand to 80 Weather Forecast Offices overseen by the Central, Eastern, Southern and Western Region Headquarters by the spring of 2015 – incorporate message tags within the main body of the product describing the source of the hazard report, damage potential, and if applicable, radar indications or physical observations of tornadoes or the possibility of a tornado; hazards are also summarized at the close of the product text (describing estimated maximum hail size and wind gusts, and if applicable, if a storm has the potential to produce a tornado or in the event of a tornado warning, the basis of the warning or its damage threat).<sup id="cite_ref-IBW_45-0" class="reference"><a href="#cite_note-IBW-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NWS_Expirements_46-0" class="reference"><a href="#cite_note-NWS_Expirements-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> The wording "<a href="/wiki/Particularly_Dangerous_Situation" class="mw-redirect" title="Particularly Dangerous Situation">Particularly Dangerous Situation</a>" (PDS), which originated by the Storm Prediction Center for use in tornado watch products during expected high-end severe weather outbreaks, is subjectively issued.<sup id="cite_ref-PDS_49-0" class="reference"><a href="#cite_note-PDS-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> It is occasionally issued with tornado warnings, normally if a large tornado capable of producing EF3 to EF5 damage or staying on the ground for long-duration – sometimes uninterrupted – paths has been reported (although a <a href="/wiki/Tornado_emergency" title="Tornado emergency">tornado emergency</a> may be issued in such cases if the tornado is expected to track into a densely populated area).<sup id="cite_ref-PDS_49-1" class="reference"><a href="#cite_note-PDS-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> PDS warnings for other alerts occur with even less frequency, and their criteria varies depending on the alert type to which the wording is applied.<sup id="cite_ref-PDS_49-2" class="reference"><a href="#cite_note-PDS-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> </p><p>Until September 30, 2007, local offices of the National Weather Service issued warnings for severe thunderstorms, tornadoes, flash flooding and marine hazards using geopolitical boundaries. The implementation of storm-based warnings on October 1, 2007, saw alerts for these meteorological or hydrological threats be delineated by <a href="/wiki/Polygon" title="Polygon">polygonal</a> shapes in map-based weather hazard products, which outline the specified sections of government sub-jurisdictions that the warning covers, based on the projected path of a storm as determined by Doppler radar at the time of the warning's issuance; however, entire counties/parishes may sometimes be included in the warning polygon, especially if they encompass a small geographical area.<sup id="cite_ref-Storm-based_50-0" class="reference"><a href="#cite_note-Storm-based-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> Warnings can be expanded, contracted (by removing jurisdictions where SPC and NWS forecasters no longer consider there to be a viable threat of severe weather, in which case, the storm-based warning may take on a <a href="/wiki/Trapezoid" title="Trapezoid">trapezoidal</a> representation in map-based watch products) or canceled before their set time of expiration by local NWS offices. </p><p>The NWS also releases Experimental Severe Weather Impact products for use on <a href="/wiki/Social_media" title="Social media">social media</a> accounts maintained by local forecast offices as well as the Enhanced Data Display (EDD), an experimental pilot project created by the <a href="/wiki/Charleston,_West_Virginia" title="Charleston, West Virginia">Charleston, West Virginia</a> office's WeatherReady Nation initiative. The product provides a graphical depiction of short-fuse warnings and watches (specifically, tornado and severe thunderstorm watches and warnings, and flash flood warnings), showing a map of the warning area (outlined as a red polygon) and locations (including communities and interstate highways) that will be impacted. For severe thunderstorm, tornado and flash flood warnings, the estimated population count of the warned area and approximate totals of public schools and hospitals within the warning area as well as the maximum forecast intensity of hail size, wind gusts and potential tornadoes; tornado warnings referenced in the impact product also denote whether the warning was issued based on radar indication or ground confirmation.<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Product_dissemination">Product dissemination</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=21" title="Edit section: Product dissemination"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Unreferenced_section plainlinks metadata ambox ambox-content ambox-Unreferenced" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>does not <a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">cite</a> any <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">sources</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/National_Weather_Service" title="Special:EditPage/National Weather Service">improve this section</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and <a href="/wiki/Wikipedia:Verifiability#Burden_of_evidence" title="Wikipedia:Verifiability">removed</a>.</span> <span class="date-container"><i>(<span class="date">October 2014</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p><b><a href="/wiki/NOAA_Weather_Radio" title="NOAA Weather Radio">NOAA Weather Radio All Hazards</a> (NWR)</b>, promoted as "The Voice of the National Weather Service", is a special radio system that transmits uninterrupted weather watches, warnings and forecasts 24 hours a day directly from a nearby NWS office, with the broadcasts covering across 95–97% of the United States' population. The system – which is owned and operated by the NWS – consists of 1,030 transmitters, covering all 50 states; adjacent coastal waters; <a href="/wiki/Puerto_Rico" title="Puerto Rico">Puerto Rico</a>; the <a href="/wiki/United_States_Virgin_Islands" title="United States Virgin Islands">U.S. Virgin Islands</a>; and the U.S. Pacific Territories of <a href="/wiki/American_Samoa" title="American Samoa">American Samoa</a>, <a href="/wiki/Guam" title="Guam">Guam</a> and the <a href="/wiki/Northern_Mariana_Islands" title="Northern Mariana Islands">Northern Mariana Islands</a>. NWR requires a scanner or special radio receiver capable of picking up the signal. Individual NWR stations broadcast any one of seven allocated frequencies centered on 162 <a href="/wiki/Megahertz" class="mw-redirect" title="Megahertz">MHz</a> (known collectively as "weather band") in the <a href="/wiki/Marine_VHF_radio" title="Marine VHF radio">marine VHF radio</a> band. In recent years, national emergency response agencies such as the <a href="/wiki/Federal_Emergency_Management_Agency" title="Federal Emergency Management Agency">Federal Emergency Management Agency</a> (FEMA) and the <a href="/wiki/United_States_Department_of_Homeland_Security" title="United States Department of Homeland Security">Department of Homeland Security</a> have begun to take advantage of NWR's ability to efficiently reach a large portion of the U.S. population. When necessary, the system can also be used (in conjunction with the <a href="/wiki/Emergency_Alert_System" title="Emergency Alert System">Emergency Alert System</a>) to broadcast civil, natural and technological emergency and disaster alerts and information, in addition to those related to weather – hence the addition of the phrasing <i>"All Hazards"</i> to the name. </p><p>The <b>NOAA Weather Wire Service (NWWS)</b> is a satellite data collection and dissemination system operated by the National Weather Service, which was established in October 2000. Its purpose is to provide state and federal government, commercial users, media and private citizens with timely delivery of meteorological, hydrological, climatological and geophysical information. All products in the NWWS data stream are prioritized, with weather and hydrologic warnings receiving the highest priority (watches are next in priority). NWWS delivers <a href="/wiki/Severe_weather" title="Severe weather">severe weather</a> and storm warnings to users in ten seconds or less from the time of their issuance, making it the fastest delivery system available. Products are broadcast to users via the <a href="/wiki/SES_Americom" title="SES Americom">AMC</a>-4 satellite. </p><p>The <b>Emergency Managers Weather Information Network (<a href="/wiki/EMWIN" title="EMWIN">EMWIN</a>)</b> is a system designed to provide the emergency management community with access to a set of NWS warnings, watches, forecasts and other products at no recurring cost. It can receive data via radio, internet, or a dedicated <a href="/wiki/Satellite_dish" title="Satellite dish">satellite dish</a>, depending on the needs and capabilities of the user. </p><p><b>NOAAPORT</b> is a one-way broadcast communication system which provides NOAA environmental data and information in near real-time to NOAA and external users. This broadcast service is implemented by a commercial provider of satellite communications utilizing <a href="/wiki/C_band_(IEEE)" title="C band (IEEE)">C band</a>. </p><p>The agency's online service, <b>Weather.gov</b>, is a data rich website operated by the NWS that serves as a portal to hundreds of thousands of webpages and more than 300 different NWS websites. Through its homepage, users can access local forecasts by entering a place name in the main forecast search bar, view a rapidly updated map of active watches and warnings, and select areas related to graphical forecasts, national maps, radar displays, river and air quality data, satellite images and climate information. Also offered are XML data feeds of active watches and warnings, ASOS observations and digital forecasts for 5x5 kilometer (3 x 3 mile) grids. All of NWS local weather forecast offices operate their own region-tailored web pages, which provide access to current products and other information specific to the office's local area of responsibility. Weather.gov superseded the <b>Interactive Weather Information Network (IWIN)</b>, the agency's early internet service which provided NWS data from the 1990s through the mid-2000s. </p><p>Since 1983, the NWS has provided external user access to weather information obtained by or derived from the U.S. Government through a collection of data communication line services called the <b>Family of Services (FOS)</b>, which is accessible via dedicated telecommunications access lines in the Washington, D.C., area. All FOS data services are driven by the NWS Telecommunication Gateway computer systems located at NWS headquarters in Silver Spring, Maryland. Users may obtain any of the individual services from NWS for a one-time connection charge and an annual user fee. </p> <div class="mw-heading mw-heading2"><h2 id="Technology">Technology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=22" title="Edit section: Technology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:NWS-Mosaic-Radar-Composite.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/NWS-Mosaic-Radar-Composite.gif/200px-NWS-Mosaic-Radar-Composite.gif" decoding="async" width="200" height="94" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/NWS-Mosaic-Radar-Composite.gif/300px-NWS-Mosaic-Radar-Composite.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/60/NWS-Mosaic-Radar-Composite.gif/400px-NWS-Mosaic-Radar-Composite.gif 2x" data-file-width="3400" data-file-height="1600" /></a><figcaption>A NWS composite radar image of the <a href="/wiki/Continental_United_States" class="mw-redirect" title="Continental United States">Continental United States</a>, composed of many regional radars.</figcaption></figure> <p>The WSR-88D <a href="/wiki/Doppler_effect" title="Doppler effect">Doppler</a> <a href="/wiki/Weather_radar" title="Weather radar">weather radar</a> system, also called <a href="/wiki/NEXRAD" title="NEXRAD">NEXRAD</a>, was developed by the National Weather Service during the mid-1980s, and fully deployed throughout the majority of the United States by 1997. There are 158 such <a href="/wiki/Radar" title="Radar">radar</a> sites in operation in the U.S., its various territorial possessions and selected overseas locations. This technology, because of its high resolution and ability to detect intra-cloud motions, is now the cornerstone of the agency's severe weather warning operations. </p><p>National Weather Service meteorologists use an advanced information processing, display and telecommunications system, the Advance Weather Interactive Processing System (<a href="/wiki/AWIPS" class="mw-redirect" title="AWIPS">AWIPS</a>), to complete their work. These workstations allow them to easily view a multitude of weather and hydrologic information, as well as compose and disseminate products. The NWS <a href="/wiki/Environmental_Modeling_Center" title="Environmental Modeling Center">Environmental Modeling Center</a> was one of the early users of the <a href="/wiki/ESMF" class="mw-redirect" title="ESMF">ESMF</a> common modeling infrastructure. The <a href="/wiki/Global_Forecast_System" title="Global Forecast System">Global Forecast System</a> (GFS) is one of the applications that is built on the framework. </p><p>In 2016, the NWS significantly increased the computational power of its supercomputers, spending $44 million on two new supercomputers from <a href="/wiki/Cray" title="Cray">Cray</a> and <a href="/wiki/IBM" title="IBM">IBM</a>. This was driven by relatively lower accuracy of NWS' <a href="/wiki/Global_Forecast_System" title="Global Forecast System">Global Forecast System</a> (GFS) <a href="/wiki/Numerical_weather_prediction" title="Numerical weather prediction">numerical weather prediction</a> model, compared to other global weather models.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> This was most notable in the GFS model incorrectly predicting <a href="/wiki/Hurricane_Sandy" title="Hurricane Sandy">Hurricane Sandy</a> turning out to sea until four days before landfall; while the <a href="/wiki/European_Centre_for_Medium-Range_Weather_Forecasts" title="European Centre for Medium-Range Weather Forecasts">European Centre for Medium-Range Weather Forecasts</a>' model predicted landfall correctly at seven days. The new supercomputers increased computational processing power from 776 tera<a href="/wiki/Flops" class="mw-redirect" title="Flops">flops</a> to 5.78 petaflops.<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Organization">Organization</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=23" title="Edit section: Organization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg/250px-Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg" decoding="async" width="250" height="169" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg/375px-Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/32/Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg/500px-Galveston_County_Office_of_Emergency_Management_%26_Houston-Galveston_National_Weather_Service_Building.jpg 2x" data-file-width="4507" data-file-height="3053" /></a><figcaption>Specially designed hurricane-proof building constructed to house joint offices of the <a href="/wiki/Houston" title="Houston">Houston</a>-<a href="/wiki/Galveston" class="mw-redirect" title="Galveston">Galveston</a> National Weather Service Forecast Office and the <a href="/wiki/Galveston_County,_Texas" title="Galveston County, Texas">Galveston County Emergency Management Office</a>.<sup id="cite_ref-chronCDA_57-0" class="reference"><a href="#cite_note-chronCDA-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup></figcaption></figure> <p>As of 2016, the National Weather Service was organized as follows<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup> </p> <ul><li>Chief Information Officer</li> <li><a href="/wiki/National_Centers_for_Environmental_Prediction" title="National Centers for Environmental Prediction">National Centers for Environmental Prediction</a> (NCEP) <ul><li><a href="/wiki/Aviation_Weather_Center" title="Aviation Weather Center">Aviation Weather Center</a> (AWC)</li> <li><a href="/wiki/Climate_Prediction_Center" title="Climate Prediction Center">Climate Prediction Center</a> (CPC)</li> <li><a href="/wiki/Environmental_Modeling_Center" title="Environmental Modeling Center">Environmental Modeling Center</a> (EMC)</li> <li><a href="/wiki/Weather_Prediction_Center" title="Weather Prediction Center">Weather Prediction Center</a> (WPC)</li> <li><a href="/wiki/Ocean_Prediction_Center" title="Ocean Prediction Center">Ocean Prediction Center</a> (OPC)</li> <li>NCEP Central Operations</li> <li><a href="/wiki/Space_Weather_Prediction_Center" title="Space Weather Prediction Center">Space Weather Prediction Center</a> (SWPC)</li> <li><a href="/wiki/Storm_Prediction_Center" title="Storm Prediction Center">Storm Prediction Center</a> (SPC)</li> <li><a href="/wiki/National_Hurricane_Center" title="National Hurricane Center">National Hurricane Center</a> (NHC) <ul><li>Hurricane Specialist Unit (HSU)</li> <li>Tropical Analysis and Forecast Branch (TAFB)</li> <li>Technical Support Branch (TSB)</li></ul></li></ul></li> <li>Chief Financial Officer</li> <li>Operational Systems</li> <li>Hydrologic Development</li> <li>Science and Technology <ul><li>Programs and Plans</li> <li>Meteorological Development Laboratory (MDL)</li></ul></li> <li>Climate, Water and Weather Services</li> <li>6 Regions (Eastern, Central, Southern, Western, Alaska & Pacific) <ul><li>122 <a href="/wiki/List_of_National_Weather_Service_Weather_Forecast_Offices" class="mw-redirect" title="List of National Weather Service Weather Forecast Offices">Weather Forecast Offices</a> (WFOs)</li> <li>21 <a href="/wiki/Center_Weather_Service_Unit" title="Center Weather Service Unit">Center Weather Service Units</a> (CWSU)</li> <li>13 River Forecast Centers (RFC)</li> <li><a href="/wiki/Pacific_Tsunami_Warning_Center" title="Pacific Tsunami Warning Center">Pacific Tsunami Warning Center</a> (PTWC)</li> <li><a href="/wiki/National_Tsunami_Warning_Center" title="National Tsunami Warning Center">National Tsunami Warning Center</a> (NTWC)</li></ul></li> <li><a href="/wiki/Spaceflight_Meteorology_Group" title="Spaceflight Meteorology Group">Spaceflight Meteorology Group</a> (SMG)</li></ul> <div class="mw-heading mw-heading2"><h2 id="Privatization_and_dismantling_attempts">Privatization and dismantling attempts</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=24" title="Edit section: Privatization and dismantling attempts"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>While respected as one of the premier weather organizations in the world, the National Weather Service has been perceived by some <a href="/wiki/Conservatism_in_the_United_States" title="Conservatism in the United States">conservatives</a> in 2005 as competing unfairly with the private sector.<sup id="cite_ref-colorado.edu_59-0" class="reference"><a href="#cite_note-colorado.edu-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> National Weather Service forecasts and data, being works of the federal government, are in the <a href="/wiki/Public_domain" title="Public domain">public domain</a> and thus available to anyone for free under United States law. From time to time, the situation receives official review to ascertain if a leaner, more efficient approach may be had by some degree of privatization.<sup id="cite_ref-60" class="reference"><a href="#cite_note-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Aborted_Byrne_proposal,_1983"><span id="Aborted_Byrne_proposal.2C_1983"></span>Aborted Byrne proposal, 1983</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=25" title="Edit section: Aborted Byrne proposal, 1983"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 1983, the <a href="/wiki/Reagan_administration" class="mw-redirect" title="Reagan administration">Reagan administration</a> and NOAA administrator <a href="/wiki/John_V._Byrne" title="John V. Byrne">John V. Byrne</a> announced a proposal to sell all of the agency's weather satellites at auction with the intent to repurchase the weather data from private contractors that would acquire the satellites. Under the proposal, 30% of NOAA's workforce would be reviewed for potential layoffs, and certain specialty forecasts of agricultural and economic importance would be eliminated. NOAA also proposed outsourcing weather observation stations, NOAA Weather Radio, and computerized surface analysis to private companies. The proposal was met with negative reactions among the public, members of Congress, and consumer advocacy groups (including most notably, <a href="/wiki/Ralph_Nader" title="Ralph Nader">Ralph Nader</a>), objecting to the possibility of weather information intended for the public domain being sold to private entities that would profit from the sale of the data. The proposal to sell the satellite network failed in a Congressional vote, while other aspects of the proposal to dismantle portions of NOAA's agencies were eventually scuttled.<sup id="cite_ref-autogenerated1_22-1" class="reference"><a href="#cite_note-autogenerated1-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Failed_Santorum_proposal,_2005"><span id="Failed_Santorum_proposal.2C_2005"></span>Failed Santorum proposal, 2005</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=26" title="Edit section: Failed Santorum proposal, 2005"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/National_Weather_Service_Duties_Act_of_2005" title="National Weather Service Duties Act of 2005">National Weather Service Duties Act of 2005</a></div> <p>In 2005, Pennsylvania Senator <a href="/wiki/Rick_Santorum" title="Rick Santorum">Rick Santorum</a> introduced the <a href="/wiki/National_Weather_Service_Duties_Act_of_2005" title="National Weather Service Duties Act of 2005">National Weather Service Duties Act of 2005</a>,<sup id="cite_ref-LOCNWSDA_61-0" class="reference"><a href="#cite_note-LOCNWSDA-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> a bill which would have prohibited the NWS from freely distributing weather data. The bill was widely criticized by users of the NWS's services, especially by emergency management officials relying on the National Weather Service for information during fires, flooding, or severe weather. Groups such as the <a href="/wiki/Aircraft_Owners_and_Pilots_Association" title="Aircraft Owners and Pilots Association">Aircraft Owners and Pilots Association</a> condemned the bill's restrictions on weather forecasting as threatening the safety of air traffic, noting that 40% of all aviation accidents are at least partially weather-related.<sup id="cite_ref-AOPA_62-0" class="reference"><a href="#cite_note-AOPA-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> The bill attracted no cosponsors, and died in committee during the 2005 Congressional session. </p> <div class="mw-heading mw-heading2"><h2 id="Accuracy_problems">Accuracy problems</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=27" title="Edit section: Accuracy problems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Critics such as <a href="/wiki/University_of_Washington" title="University of Washington">University of Washington</a> professor Cliff Mass<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> have claimed that NWS forecasts are not as accurate as they could be, and that this has resulted in inaccurate daily weather forecasts and dangerously bad predictions concerning the location and intensity of extreme weather events like blizzards and hurricanes. In 2016, the British <a href="/wiki/Met_Office" title="Met Office">Met Office</a>, the <a href="/wiki/European_Centre_for_Medium-Range_Weather_Forecasts" title="European Centre for Medium-Range Weather Forecasts">European Centre for Medium-Range Weather Forecasts</a> (ECMWF), and the Northwest Regional Modeling Consortium in Seattle have been cited as producing more accurate predictions in certain circumstances. According to critics, causes include:<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup> </p> <ul><li>Lack of sufficient computing power to run simulations known to be better (including higher-resolution simulations and "ensemble" forecasts where multiple runs tweak variables slightly to detect low-confidence simulations)</li> <li>Not using techniques shown to improve accuracy by recent academic research</li> <li>Not <a href="/wiki/Data_assimilation" title="Data assimilation">assimilating data</a> from all available sources, such as <a href="/wiki/TAMDAR" title="TAMDAR">TAMDAR</a> data from commercial airliners. (Due to budget cuts, this could not be purchased from <a href="/wiki/Panasonic" title="Panasonic">Panasonic</a> Weather Solutions on an ongoing basis.)</li> <li>Lack of updated equipment on weather satellites</li> <li>Lack of focus on a small number of high-quality models compared to the Met Office and the ECMWF <a href="/wiki/Integrated_Forecast_System" title="Integrated Forecast System">Integrated Forecast System</a></li> <li>Organizational <a href="/wiki/Stovepiping" title="Stovepiping">stovepiping</a> and turf wars</li> <li>Resistance to change by powerful employee unions</li></ul> <p>The Next Generation Global Prediction System project at NWS <sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> aims to address some of these criticisms by running a unified high-quality model that takes advantage of more recent research results.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (January 2024)">citation needed</span></a></i>]</sup> In 2016, the NOAA announced to develop The Next Generation Global Prediction System.<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=28" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1130092004">.mw-parser-output .portal-bar{font-size:88%;font-weight:bold;display:flex;justify-content:center;align-items:baseline}.mw-parser-output .portal-bar-bordered{padding:0 2em;background-color:#fdfdfd;border:1px solid #a2a9b1;clear:both;margin:1em auto 0}.mw-parser-output .portal-bar-related{font-size:100%;justify-content:flex-start}.mw-parser-output .portal-bar-unbordered{padding:0 1.7em;margin-left:0}.mw-parser-output .portal-bar-header{margin:0 1em 0 0.5em;flex:0 0 auto;min-height:24px}.mw-parser-output .portal-bar-content{display:flex;flex-flow:row wrap;flex:0 1 auto;padding:0.15em 0;column-gap:1em;align-items:baseline;margin:0;list-style:none}.mw-parser-output .portal-bar-content-related{margin:0;list-style:none}.mw-parser-output .portal-bar-item{display:inline-block;margin:0.15em 0.2em;min-height:24px;line-height:24px}@media screen and (max-width:768px){.mw-parser-output .portal-bar{font-size:88%;font-weight:bold;display:flex;flex-flow:column wrap;align-items:baseline}.mw-parser-output .portal-bar-header{text-align:center;flex:0;padding-left:0.5em;margin:0 auto}.mw-parser-output .portal-bar-related{font-size:100%;align-items:flex-start}.mw-parser-output .portal-bar-content{display:flex;flex-flow:row wrap;align-items:center;flex:0;column-gap:1em;border-top:1px solid #a2a9b1;margin:0 auto;list-style:none}.mw-parser-output .portal-bar-content-related{border-top:none;margin:0;list-style:none}}.mw-parser-output .navbox+link+.portal-bar,.mw-parser-output .navbox+style+.portal-bar,.mw-parser-output .navbox+link+.portal-bar-bordered,.mw-parser-output .navbox+style+.portal-bar-bordered,.mw-parser-output .sister-bar+link+.portal-bar,.mw-parser-output .sister-bar+style+.portal-bar,.mw-parser-output .portal-bar+.navbox-styles+.navbox,.mw-parser-output .portal-bar+.navbox-styles+.sister-bar{margin-top:-1px}</style><div class="portal-bar noprint metadata noviewer portal-bar-bordered" role="navigation" aria-label="Portals"><span class="portal-bar-header"><a href="/wiki/Wikipedia:Contents/Portals" title="Wikipedia:Contents/Portals">Portals</a>:</span><ul class="portal-bar-content"><li class="portal-bar-item"><span class="nowrap"><span class="mw-image-border" typeof="mw:File"><span><img alt="flag" src="//upload.wikimedia.org/wikipedia/en/thumb/a/a4/Flag_of_the_United_States.svg/21px-Flag_of_the_United_States.svg.png" decoding="async" width="21" height="11" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/a/a4/Flag_of_the_United_States.svg/32px-Flag_of_the_United_States.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/a/a4/Flag_of_the_United_States.svg/42px-Flag_of_the_United_States.svg.png 2x" data-file-width="1235" data-file-height="650" /></span></span> </span><a href="/wiki/Portal:United_States" title="Portal:United States">United States</a></li><li class="portal-bar-item"><span class="nowrap"><span class="mw-image-border" typeof="mw:File"><a href="/wiki/File:A_coloured_voting_box.svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/en/thumb/0/01/A_coloured_voting_box.svg/19px-A_coloured_voting_box.svg.png" decoding="async" width="19" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/0/01/A_coloured_voting_box.svg/29px-A_coloured_voting_box.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/0/01/A_coloured_voting_box.svg/38px-A_coloured_voting_box.svg.png 2x" data-file-width="160" data-file-height="160" /></a></span> </span><a href="/wiki/Portal:Politics" title="Portal:Politics">Politics</a></li></ul></div> <ul><li><a href="/wiki/Reginald_Fessenden" title="Reginald Fessenden">Reginald Fessenden</a> – known for proving the practicality of using a network of coastal radio stations to transmit weather information</li> <li><a href="/wiki/Meteorological_Service_of_Canada" title="Meteorological Service of Canada">Meteorological Service of Canada</a> – a Canadian weather forecasting agency operated under <a href="/wiki/Environment_Canada" class="mw-redirect" title="Environment Canada">Environment Canada</a>, founded in 1876</li> <li><a href="/wiki/NOAA%27s_Environmental_Real-time_Observation_Network" title="NOAA's Environmental Real-time Observation Network">NOAA's Environmental Real-time Observation Network</a></li> <li><a href="/wiki/Radar_Operations_Center" title="Radar Operations Center">Radar Operations Center</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=National_Weather_Service&action=edit&section=29" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output 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.citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a 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Retrieved <span class="nowrap">March 2,</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=aip.org&rft.atitle=Final+FY21+Appropriations%3A+National+Oceanic+and+Atmospheric+Administration&rft.date=2021-01-27&rft_id=https%3A%2F%2Fwww.aip.org%2Ffyi%2F2021%2Ffinal-fy21-appropriations-national-oceanic-and-atmospheric-administration&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-census1-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-census1_6-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110607190628/http://factfinder.census.gov/servlet/MapItDrawServlet?geo_id=16000US2472450&_bucket_id=50&tree_id=420&context=saff&_lang=en&_sse=on">"Silver Spring CDP, Maryland"</a>. <a href="/wiki/U.S._Census_Bureau" class="mw-redirect" title="U.S. Census Bureau">U.S. Census Bureau</a>. Archived from <a rel="nofollow" class="external text" href="http://factfinder.census.gov/servlet/MapItDrawServlet?geo_id=16000US2472450&_bucket_id=50&tree_id=420&context=saff&_lang=en&_sse=on">the original</a> on June 7, 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">August 2,</span> 2009</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Silver+Spring+CDP%2C+Maryland&rft.pub=U.S.+Census+Bureau&rft_id=http%3A%2F%2Ffactfinder.census.gov%2Fservlet%2FMapItDrawServlet%3Fgeo_id%3D16000US2472450%26_bucket_id%3D50%26tree_id%3D420%26context%3Dsaff%26_lang%3Den%26_sse%3Don&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-NWSsite-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-NWSsite_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.nws.noaa.gov/">"NOAA's National Weather Service"</a>. National Weather Service<span class="reference-accessdate">. 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Retrieved <span class="nowrap">June 27,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=NWS+History&rft.pub=National+Weather+Service&rft_id=https%3A%2F%2Fwww.weather.gov%2Ftimeline%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFoster2023" class="citation journal cs1">Foster, Alyson (Fall 2023). <a rel="nofollow" class="external text" href="https://www.neh.gov/article/storm-patrol">"In the Nineteenth Century, Scientists Set Out to Solve the "Problem of American Storms"<span class="cs1-kern-right"></span>"</a>. <i>Humanities</i>. <b>44</b> (4). National Endowment for the Humanities<span class="reference-accessdate">. Retrieved <span class="nowrap">December 14,</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Humanities&rft.atitle=In+the+Nineteenth+Century%2C+Scientists+Set+Out+to+Solve+the+%22Problem+of+American+Storms%22&rft.ssn=fall&rft.volume=44&rft.issue=4&rft.date=2023&rft.aulast=Foster&rft.aufirst=Alyson&rft_id=https%3A%2F%2Fwww.neh.gov%2Farticle%2Fstorm-patrol&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-ScanningSkies-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-ScanningSkies_12-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBradford2001" class="citation book cs1">Bradford, Marlene (2001). <a rel="nofollow" class="external text" href="https://archive.org/details/scanningskieshis0000brad/page/34">"Tornado Forecasting to 1940"</a>. <i>Scanning the Skies: A History of Tornado Forecasting</i>. <a href="/wiki/University_of_Oklahoma_Press" title="University of Oklahoma Press">University of Oklahoma Press</a>. p. <a rel="nofollow" class="external text" href="https://archive.org/details/scanningskieshis0000brad/page/34">34</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-8061-3302-7" title="Special:BookSources/978-0-8061-3302-7"><bdi>978-0-8061-3302-7</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/00059979">00059979</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Tornado+Forecasting+to+1940&rft.btitle=Scanning+the+Skies%3A+A+History+of+Tornado+Forecasting&rft.pages=34&rft.pub=University+of+Oklahoma+Press&rft.date=2001&rft_id=info%3Alccn%2F00059979&rft.isbn=978-0-8061-3302-7&rft.aulast=Bradford&rft.aufirst=Marlene&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fscanningskieshis0000brad%2Fpage%2F34&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-stormwarning1-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-stormwarning1_13-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMathis2007" class="citation book cs1">Mathis, Nancy (2007). <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/46">"A Tornado Forecast"</a>. <i>Storm Warning: The Story of a Killer Tornado</i>. <a href="/wiki/Simon_%26_Schuster" title="Simon & Schuster">Touchstone</a>. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/46">46–50</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7432-8053-2" title="Special:BookSources/978-0-7432-8053-2"><bdi>978-0-7432-8053-2</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/2006051237">2006051237</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=A+Tornado+Forecast&rft.btitle=Storm+Warning%3A+The+Story+of+a+Killer+Tornado&rft.pages=46-50&rft.pub=Touchstone&rft.date=2007&rft_id=info%3Alccn%2F2006051237&rft.isbn=978-0-7432-8053-2&rft.aulast=Mathis&rft.aufirst=Nancy&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fstormwarningstor00math%2Fpage%2F46&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-stormwarning2-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-stormwarning2_14-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMathis2007" class="citation book cs1">Mathis, Nancy (2007). <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/51">"A Tornado Forecast"</a>. <i>Storm Warning: The Story of a Killer Tornado</i>. Touchstone. p. <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/51">51</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7432-8053-2" title="Special:BookSources/978-0-7432-8053-2"><bdi>978-0-7432-8053-2</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/2006051237">2006051237</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=A+Tornado+Forecast&rft.btitle=Storm+Warning%3A+The+Story+of+a+Killer+Tornado&rft.pages=51&rft.pub=Touchstone&rft.date=2007&rft_id=info%3Alccn%2F2006051237&rft.isbn=978-0-7432-8053-2&rft.aulast=Mathis&rft.aufirst=Nancy&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fstormwarningstor00math%2Fpage%2F51&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-stormwarning3-15"><span class="mw-cite-backlink">^ <a href="#cite_ref-stormwarning3_15-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-stormwarning3_15-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMathis2007" class="citation book cs1">Mathis, Nancy (2007). <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/47">"A Tornado Forecast"</a>. <i>Storm Warning: The Story of a Killer Tornado</i>. Touchstone. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/47">47–53</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7432-8053-2" title="Special:BookSources/978-0-7432-8053-2"><bdi>978-0-7432-8053-2</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/2006051237">2006051237</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=A+Tornado+Forecast&rft.btitle=Storm+Warning%3A+The+Story+of+a+Killer+Tornado&rft.pages=47-53&rft.pub=Touchstone&rft.date=2007&rft_id=info%3Alccn%2F2006051237&rft.isbn=978-0-7432-8053-2&rft.aulast=Mathis&rft.aufirst=Nancy&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fstormwarningstor00math%2Fpage%2F47&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-AviationWS-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-AviationWS_16-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFUnited_States_National_Research_Council1995" class="citation book cs1"><a href="/wiki/United_States_National_Research_Council" class="mw-redirect" title="United States National Research Council">United States National Research Council</a> (1995). "Current Roles and Missions". <i>Aviation Weather Services: A Call For Federal Leadership and Action</i>. <a href="/wiki/National_Academies_Press" title="National Academies Press">National Academies Press</a>. p. 18. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.17226%2F5037">10.17226/5037</a>. <a href="/wiki/Hdl_(identifier)" class="mw-redirect" title="Hdl (identifier)">hdl</a>:<a rel="nofollow" class="external text" href="https://hdl.handle.net/2027%2Fien.35556021395504">2027/ien.35556021395504</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-309-05380-8" title="Special:BookSources/978-0-309-05380-8"><bdi>978-0-309-05380-8</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/95072006">95072006</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Current+Roles+and+Missions&rft.btitle=Aviation+Weather+Services%3A+A+Call+For+Federal+Leadership+and+Action&rft.pages=18&rft.pub=National+Academies+Press&rft.date=1995&rft_id=info%3Ahdl%2F2027%2Fien.35556021395504&rft_id=info%3Alccn%2F95072006&rft_id=info%3Adoi%2F10.17226%2F5037&rft.isbn=978-0-309-05380-8&rft.au=United+States+National+Research+Council&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://matherhodge.com/tribute/details/96/Margaret-Smagorinsky/obituary.html">"Obituary of Margaret Smagorinsky | The Mather-Hodge Funeral Home"</a>. <i>matherhodge.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">August 18,</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=matherhodge.com&rft.atitle=Obituary+of+Margaret+Smagorinsky+%7C+The+Mather-Hodge+Funeral+Home&rft_id=https%3A%2F%2Fmatherhodge.com%2Ftribute%2Fdetails%2F96%2FMargaret-Smagorinsky%2Fobituary.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://opensky.ucar.edu/islandora/object/archives%3A7644">"Transcript of Oral History Interview of Margaret Smagorinsky - American Meteorological Society Oral History Project"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Transcript+of+Oral+History+Interview+of+Margaret+Smagorinsky+-+American+Meteorological+Society+Oral+History+Project&rft_id=https%3A%2F%2Fopensky.ucar.edu%2Fislandora%2Fobject%2Farchives%253A7644&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFEdwards" class="citation web cs1"><a href="/wiki/Roger_Edwards_(meteorologist)" title="Roger Edwards (meteorologist)">Edwards, Roger</a>. <a rel="nofollow" class="external text" href="https://www.spc.noaa.gov/faq/tornado/#Forecasting">"The Online Tornado FAQ"</a>. <a href="/wiki/Storm_Prediction_Center" title="Storm Prediction Center">Storm Prediction Center</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180326103341/https://www.spc.noaa.gov/faq/tornado/#Forecasting">Archived</a> from the original on March 26, 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">July 6,</span> 2009</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Online+Tornado+FAQ&rft.pub=Storm+Prediction+Center&rft.aulast=Edwards&rft.aufirst=Roger&rft_id=https%3A%2F%2Fwww.spc.noaa.gov%2Ffaq%2Ftornado%2F%23Forecasting&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-stormwarning4-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-stormwarning4_20-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMathis2007" class="citation book cs1">Mathis, Nancy (2007). <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/86">"Priority One"</a>. <i>Storm Warning: The Story of a Killer Tornado</i>. Touchstone. p. <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/86">86</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7432-8053-2" title="Special:BookSources/978-0-7432-8053-2"><bdi>978-0-7432-8053-2</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/2006051237">2006051237</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Priority+One&rft.btitle=Storm+Warning%3A+The+Story+of+a+Killer+Tornado&rft.pages=86&rft.pub=Touchstone&rft.date=2007&rft_id=info%3Alccn%2F2006051237&rft.isbn=978-0-7432-8053-2&rft.aulast=Mathis&rft.aufirst=Nancy&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fstormwarningstor00math%2Fpage%2F86&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFUS_Department_of_Commerce" class="citation web cs1">US Department of Commerce, NOAA. <a rel="nofollow" class="external text" href="https://www.weather.gov/about/radar">"Radar"</a>. <i>www.weather.gov</i><span class="reference-accessdate">. Retrieved <span class="nowrap">October 19,</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.weather.gov&rft.atitle=Radar&rft.aulast=US+Department+of+Commerce&rft.aufirst=NOAA&rft_id=https%3A%2F%2Fwww.weather.gov%2Fabout%2Fradar&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANational+Weather+Service" class="Z3988"></span></span> </li> <li id="cite_note-autogenerated1-22"><span class="mw-cite-backlink">^ <a href="#cite_ref-autogenerated1_22-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-autogenerated1_22-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNancy_Mathis2007" class="citation book cs1">Nancy Mathis (2007). <a rel="nofollow" class="external text" href="https://archive.org/details/stormwarningstor00math/page/90"><i>Storm Warning: The Story of a Killer Tornado</i></a>. 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title="Template:United States government agencies involved in environmental science"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:United_States_government_agencies_involved_in_environmental_science" title="Template talk:United States government agencies involved in environmental science"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:United_States_government_agencies_involved_in_environmental_science" title="Special:EditPage/Template:United States government agencies involved in environmental science"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="United_States_government_agencies_involved_in_environmental_science" style="font-size:114%;margin:0 4em"><a href="/wiki/List_of_federal_agencies_in_the_United_States" title="List of federal agencies in the United States">United States government agencies</a> involved in <a href="/wiki/Environmental_science" title="Environmental science">environmental science</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><b><a href="/wiki/United_States_Environmental_Protection_Agency" title="United States Environmental Protection Agency">Environmental Protection Agency</a></b></li> <li><b><a href="/wiki/U.S._Global_Change_Research_Program" title="U.S. Global Change Research Program">Global Change Research Program</a></b></li> <li><b><a href="/wiki/NASA" title="NASA">National Aeronautics and Space Administration</a></b></li> <li><b><a href="/wiki/National_Science_Foundation" title="National Science Foundation">National Science Foundation</a></b></li> <li><b><a href="/wiki/Smithsonian_Institution" title="Smithsonian Institution">Smithsonian Institution</a></b></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/United_States_Department_of_the_Interior" title="United States Department of the Interior">Department of the Interior</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bureau_of_Indian_Affairs" title="Bureau of Indian Affairs">Bureau of Indian Affairs</a></li> <li><a href="/wiki/Bureau_of_Land_Management" title="Bureau of Land Management">Bureau of Land Management</a></li> <li><a href="/wiki/Bureau_of_Ocean_Energy_Management" title="Bureau of Ocean Energy Management">Bureau of Ocean Energy Management</a></li> <li><a href="/wiki/United_States_Bureau_of_Reclamation" title="United States Bureau of Reclamation">Bureau of Reclamation</a></li> <li><a href="/wiki/National_Park_Service" title="National Park Service">National Park Service</a></li> <li><a href="/wiki/United_States_Fish_and_Wildlife_Service" title="United States Fish and Wildlife Service">United States Fish and Wildlife Service</a></li> <li><a href="/wiki/United_States_Geological_Survey" title="United States Geological Survey">United States Geological Survey</a></li> <li><a href="/wiki/Office_of_Insular_Affairs" title="Office of Insular Affairs">Office of the Assistant Secretary for Insular and International Affairs</a></li> <li><a href="/wiki/Office_of_Surface_Mining" class="mw-redirect" title="Office of Surface Mining">Office of Surface Mining, Reclamation, and Enforcement</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/United_States_Department_of_Commerce" title="United States Department of Commerce">Department of Commerce</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a> <ul><li><a href="/wiki/U.S._National_Geodetic_Survey" title="U.S. National Geodetic Survey">Geodetic Survey</a></li> <li><a href="/wiki/National_Marine_Fisheries_Service" title="National Marine Fisheries Service">Marine Fisheries Service</a></li> <li><a href="/wiki/National_Ocean_Service" title="National Ocean Service">Ocean Service</a></li> <li><a href="/wiki/Office_of_Oceanic_and_Atmospheric_Research" title="Office of Oceanic and Atmospheric Research">Oceanic and Atmospheric Research</a></li> <li><a class="mw-selflink selflink">Weather Service</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/United_States_Department_of_Energy" title="United States Department of Energy">Department of Energy</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Office_of_Energy_Efficiency_and_Renewable_Energy" title="Office of Energy Efficiency and Renewable Energy">Office of Energy Efficiency and Renewable Energy</a></li> <li>Office of Environmental Management</li> <li><a href="/wiki/Office_of_Science" title="Office of Science">Office of Science</a></li> <li><a href="/wiki/United_States_Department_of_Energy_national_laboratories" class="mw-redirect" title="United States Department of Energy national laboratories">National Laboratories and Technology Centers</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/United_States_Department_of_Agriculture" title="United States Department of Agriculture">Department of Agriculture</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Agricultural_Research_Service" title="Agricultural Research Service">Agricultural Research Service</a></li> <li><a href="/wiki/Animal_and_Plant_Health_Inspection_Service" title="Animal and Plant Health Inspection Service">Animal and Plant Health Inspection Service</a></li> <li><a href="/wiki/Farm_Service_Agency" title="Farm Service Agency">Farm Service Agency</a></li> <li><a href="/wiki/Food_and_Nutrition_Service" title="Food and Nutrition Service">Food and Nutrition Service</a></li> <li><a href="/wiki/Foreign_Agricultural_Service" title="Foreign Agricultural Service">Foreign Agricultural Service</a></li> <li><a href="/wiki/Natural_Resources_Conservation_Service" title="Natural Resources Conservation Service">Natural Resources Conservation Service</a> (<a href="/wiki/National_Water_and_Climate_Center" title="National Water and Climate Center">National Water and Climate Center</a>)</li> <li><a href="/wiki/Rural_Utilities_Service" title="Rural Utilities Service">Rural Utilities Service</a></li> <li><a href="/wiki/United_States_Forest_Service" title="United States Forest Service">Forest Service</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/United_States_Department_of_Homeland_Security" title="United States Department of Homeland Security">Department of Homeland Security</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/DHS_Directorate_for_Science_and_Technology" class="mw-redirect" title="DHS Directorate for Science and Technology">Science and Technology Directorate</a></li> <li><a href="/wiki/United_States_Coast_Guard" title="United States Coast Guard">United States Coast Guard</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Department_of_Health_and_Human_Services" class="mw-redirect" title="Department of Health and Human Services">Department of Health <br />and Human Services</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Agency_for_Toxic_Substances_and_Disease_Registry" title="Agency for Toxic Substances and Disease Registry">Agency for Toxic Substances and Disease Registry</a></li> <li><a href="/wiki/Centers_for_Disease_Control_and_Prevention" title="Centers for Disease Control and Prevention">Centers for Disease Control and Prevention</a></li> <li><a href="/wiki/National_Institute_of_Environmental_Health_Sciences" title="National Institute of Environmental Health Sciences">National Institute of Environmental Health Sciences</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/United_States_Department_of_Defense" title="United States Department of Defense">Department of Defense</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Air_Force_Research_Laboratory" title="Air Force Research Laboratory">Air Force Research Laboratory</a></li> <li><a href="/wiki/Defense_Advanced_Research_Projects_Agency" class="mw-redirect" title="Defense Advanced Research Projects Agency">Defense Advanced Research Projects Agency</a></li> <li><a href="/wiki/Joint_Typhoon_Warning_Center" title="Joint Typhoon Warning Center">Joint Typhoon Warning Center</a></li> <li><a href="/wiki/Office_of_Naval_Research" title="Office of Naval Research">Office of Naval Research</a></li> <li><a href="/wiki/United_States_Army_Research,_Development_and_Engineering_Command" class="mw-redirect" title="United States Army Research, Development and Engineering Command">Combat Capabilities Development Command</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Executive_Office_of_the_President_of_the_United_States" title="Executive Office of the President of the United States">Executive Office of the President</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/White_House_Office_of_Domestic_Climate_Policy" title="White House Office of Domestic Climate Policy">Climate Policy Office</a></li> <li><a href="/wiki/White_House_Office_on_Clean_Energy_Innovation_and_Implementation" title="White House Office on Clean Energy Innovation and Implementation">Clean Energy Innovation and Implementation</a></li> <li><a href="/wiki/U.S._Special_Presidential_Envoy_for_Climate" title="U.S. Special Presidential Envoy for Climate">U.S. Special Presidential Envoy for Climate</a></li> <li><a href="/wiki/Council_on_Environmental_Quality" title="Council on Environmental Quality">Council on Environmental Quality</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Defunct</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Environmental_Science_Services_Administration" title="Environmental Science Services Administration">Environmental Science Services Administration</a></li> <li><a href="/wiki/United_States_Fish_Commission" title="United States Fish Commission">United States Fish Commission</a></li> <li><a href="/wiki/United_States_Coast_and_Geodetic_Survey" title="United States Coast and Geodetic Survey">United States Coast and Geodetic Survey</a></li> <li><a href="/wiki/White_House_Office_of_Energy_and_Climate_Change_Policy" title="White House Office of Energy and Climate Change Policy">White House Office of Energy and Climate Change Policy</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="National_meteorological_organizations" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:National_meteorological_organizations" title="Template:National meteorological organizations"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:National_meteorological_organizations" title="Template talk:National meteorological organizations"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:National_meteorological_organizations" title="Special:EditPage/Template:National meteorological organizations"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="National_meteorological_organizations" style="font-size:114%;margin:0 4em">National <a href="/wiki/List_of_meteorology_institutions" title="List of meteorology institutions">meteorological organizations</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Africa</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/National_Meteorological_Office" title="National Meteorological Office">Algeria</a></li> <li><a href="/wiki/Ghana_Meteorological_Agency" title="Ghana Meteorological Agency">Ghana</a></li> <li><a href="/wiki/Mozambique_National_Institute_of_Meteorology" title="Mozambique National Institute of Meteorology">Mozambique</a></li> <li><a href="/wiki/South_African_Weather_Service" title="South African Weather Service">South Africa</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Americas</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Servicio_Meteorol%C3%B3gico_Nacional_(Argentina)" title="Servicio Meteorológico Nacional (Argentina)">Argentina</a></li> <li><a href="/wiki/Bermuda_Weather_Service" title="Bermuda Weather Service">Bermuda</a></li> <li><a href="/wiki/National_Institute_of_Meteorology" title="National Institute of Meteorology">Brazil</a></li> <li><a href="/wiki/Meteorological_Service_of_Canada" title="Meteorological Service of Canada">Canada</a></li> <li><a href="/w/index.php?title=Meteorological_Directorate_of_Chile&action=edit&redlink=1" class="new" title="Meteorological Directorate of Chile (page does not exist)">Chile</a></li> <li><a href="/wiki/Institute_of_Hydrology,_Meteorology_and_Environmental_Studies_(Colombia)" title="Institute of Hydrology, Meteorology and Environmental Studies (Colombia)">Colombia</a></li> <li><a href="/wiki/Instituto_Meteorol%C3%B3gico_Nacional" title="Instituto Meteorológico Nacional">Costa Rica</a></li> <li><a href="/wiki/Institute_of_Meteorology_(Cuba)" class="mw-redirect" title="Institute of Meteorology (Cuba)">Cuba</a></li> <li><a href="/wiki/Instituto_Nacional_de_Meteorolog%C3%ADa_e_Hidrolog%C3%ADa_(Ecuador)" title="Instituto Nacional de Meteorología e Hidrología (Ecuador)">Ecuador</a></li> <li><a href="/wiki/Instituto_Nacional_de_Sismolog%C3%ADa,_Vulcanolog%C3%ADa,_Meteorolog%C3%ADa_e_Hidrolog%C3%ADa" title="Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología">Guatemala</a></li> <li><a href="/wiki/Servicio_Meteorol%C3%B3gico_Nacional_(Mexico)" title="Servicio Meteorológico Nacional (Mexico)">Mexico</a></li> <li><a class="mw-selflink selflink">United States</a></li> <li><a href="/wiki/Uruguayan_Institute_of_Meteorology" title="Uruguayan Institute of Meteorology">Uruguay</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Asia</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Afghanistan_Meteorological_Authority" title="Afghanistan Meteorological Authority">Afghanistan</a></li> <li><a href="/wiki/Bangladesh_Meteorological_Department" title="Bangladesh Meteorological Department">Bangladesh</a></li> <li><a href="/wiki/National_Center_for_Hydrology_and_Meteorology" title="National Center for Hydrology and Meteorology">Bhutan</a></li> <li><a href="/wiki/China_Meteorological_Administration" title="China Meteorological Administration">China</a> <ul><li><a href="/wiki/Hong_Kong_Observatory" title="Hong Kong Observatory">Hong Kong</a></li> <li><a href="/wiki/Meteorological_and_Geophysical_Bureau" title="Meteorological and Geophysical Bureau">Macau</a></li></ul></li> <li><a href="/wiki/India_Meteorological_Department" title="India Meteorological Department">India</a></li> <li><a href="/wiki/Meteorology,_Climatology,_and_Geophysical_Agency" title="Meteorology, Climatology, and Geophysical Agency">Indonesia</a></li> <li><a href="/wiki/Iran_Meteorological_Organization" title="Iran Meteorological Organization">Iran</a></li> <li><a href="/wiki/Israel_Meteorological_Service" title="Israel Meteorological Service">Israel</a></li> <li><a href="/wiki/Japan_Meteorological_Agency" title="Japan Meteorological Agency">Japan</a></li> <li><a href="/wiki/State_Hydro-Meteorological_Administration" title="State Hydro-Meteorological Administration">Korea (DPRK)</a></li> <li><a href="/wiki/Korea_Meteorological_Administration" title="Korea Meteorological Administration">Korea (ROK)</a></li> <li><a href="/wiki/Malaysian_Meteorological_Department" title="Malaysian Meteorological Department">Malaysia</a></li> <li><a href="/wiki/Pakistan_Meteorological_Department" title="Pakistan Meteorological Department">Pakistan</a></li> <li><a href="/wiki/Palestinian_Meteorological_Department" title="Palestinian Meteorological Department">Palestine</a></li> <li><a href="/wiki/PAGASA" title="PAGASA">Philippines</a></li> <li><a href="/wiki/Federal_Service_for_Hydrometeorology_and_Environmental_Monitoring_of_Russia" class="mw-redirect" title="Federal Service for Hydrometeorology and Environmental Monitoring of Russia">Russia</a></li> <li><a href="/wiki/National_Center_for_Meteorology_(Saudi_Arabia)" title="National Center for Meteorology (Saudi Arabia)">Saudi Arabia</a></li> <li><a href="/wiki/Meteorological_Service_Singapore" title="Meteorological Service Singapore">Singapore</a></li> <li><a href="/wiki/Central_Weather_Administration" title="Central Weather Administration">Taiwan</a></li> <li><a href="/wiki/Thai_Meteorological_Department" title="Thai Meteorological Department">Thailand</a></li> <li><a href="/wiki/Turkish_State_Meteorological_Service" title="Turkish State Meteorological Service">Turkey</a></li> <li><a href="/w/index.php?title=Institute_of_Seismology_and_Atmospheric_Physics_of_the_Academy_of_Sciences_of_Turkmenistan&action=edit&redlink=1" class="new" title="Institute of Seismology and Atmospheric Physics of the Academy of Sciences of Turkmenistan (page does not exist)">Turkmenistan</a></li> <li><a href="/wiki/National_Center_for_Meteorology_(United_Arab_Emirates)" title="National Center for Meteorology (United Arab Emirates)">United Arab Emirates</a></li> <li><a href="/wiki/National_Center_for_Hydro-Meteorological_Forecasting" title="National Center for Hydro-Meteorological Forecasting">Vietnam</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Europe</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Central_Institution_for_Meteorology_and_Geodynamics" title="Central Institution for Meteorology and Geodynamics">Austria</a></li> <li><a href="/wiki/Royal_Meteorological_Institute" title="Royal Meteorological Institute">Belgium</a></li> <li><a href="/wiki/Croatian_Meteorological_and_Hydrological_Service" title="Croatian Meteorological and Hydrological Service">Croatia</a></li> <li><a href="/wiki/Czech_Hydrometeorological_Institute" title="Czech Hydrometeorological Institute">Czech Republic</a></li> <li><a href="/wiki/Danish_Meteorological_Institute" title="Danish Meteorological Institute">Denmark</a></li> <li><a href="/wiki/Estonian_Weather_Service" title="Estonian Weather Service">Estonia</a></li> <li><a href="/wiki/Finnish_Meteorological_Institute" title="Finnish Meteorological Institute">Finland</a></li> <li><a href="/wiki/M%C3%A9t%C3%A9o-France" title="Météo-France">France</a></li> <li><a href="/wiki/Deutscher_Wetterdienst" title="Deutscher Wetterdienst">Germany</a></li> <li><a href="/wiki/Hellenic_National_Meteorological_Service" title="Hellenic National Meteorological Service">Greece</a></li> <li><a href="/wiki/Icelandic_Meteorological_Office" title="Icelandic Meteorological Office">Iceland</a></li> <li><a href="/wiki/Met_%C3%89ireann" title="Met Éireann">Ireland</a></li> <li><a href="/wiki/Servizio_Meteorologico" title="Servizio Meteorologico">Italy</a></li> <li><a href="/wiki/Latvian_Environment,_Geology_and_Meteorology_Centre" title="Latvian Environment, Geology and Meteorology Centre">Latvia</a></li> <li><a href="/wiki/Lithuanian_Hydrometeorological_Service" class="mw-redirect" title="Lithuanian Hydrometeorological Service">Lithuania</a></li> <li><a href="/wiki/Hydrometeorological_Institute_of_Montenegro" title="Hydrometeorological Institute of Montenegro">Montenegro</a></li> <li><a href="/wiki/Royal_Netherlands_Meteorological_Institute" title="Royal Netherlands Meteorological Institute">Netherlands</a></li> <li><a href="/wiki/Norwegian_Meteorological_Institute" title="Norwegian Meteorological Institute">Norway</a></li> <li><a href="/wiki/Instituto_Portugu%C3%AAs_do_Mar_e_da_Atmosfera" title="Instituto Português do Mar e da Atmosfera">Portugal</a></li> <li><a href="/wiki/Administra%C8%9Bia_Na%C8%9Bional%C4%83_de_Meteorologie" title="Administrația Națională de Meteorologie">Romania</a></li> <li><a href="/wiki/Federal_Service_for_Hydrometeorology_and_Environmental_Monitoring_of_Russia" class="mw-redirect" title="Federal Service for Hydrometeorology and Environmental Monitoring of Russia">Russia</a></li> <li><a href="/wiki/Republic_Hydrometeorological_Institute_of_Serbia" title="Republic Hydrometeorological Institute of Serbia">Serbia</a></li> <li><a href="/wiki/Slovenian_Environment_Agency" title="Slovenian Environment Agency">Slovenia</a></li> <li><a href="/wiki/State_Meteorological_Agency" title="State Meteorological Agency">Spain</a></li> <li><a href="/wiki/Swedish_Meteorological_and_Hydrological_Institute" title="Swedish Meteorological and Hydrological Institute">Sweden</a></li> <li><a href="/wiki/MeteoSwiss" title="MeteoSwiss">Switzerland</a></li> <li><a href="/wiki/Turkish_State_Meteorological_Service" title="Turkish State Meteorological Service">Turkey</a></li> <li><a href="/wiki/Met_Office" title="Met Office">United Kingdom</a></li> <li><a href="/w/index.php?title=Ukrainian_Hydrometeorological_Center&action=edit&redlink=1" class="new" title="Ukrainian Hydrometeorological Center (page does not exist)">Ukraine</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Oceania</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bureau_of_Meteorology" title="Bureau of Meteorology">Australia</a></li> <li><a href="/wiki/Fiji_Meteorological_Service" title="Fiji Meteorological Service">Fiji</a></li> <li><a href="/wiki/MetService" title="MetService">New Zealand</a></li> <li><a href="/wiki/Tonga_Meteorological_Service" title="Tonga Meteorological Service">Tonga</a></li> <li><a href="/wiki/Tuvalu_Meteorological_Service" title="Tuvalu Meteorological Service">Tuvalu</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li>Regional: <ul><li><a href="/wiki/Caribbean_Institute_for_Meteorology_and_Hydrology" title="Caribbean Institute for Meteorology and Hydrology">Caribbean Institute for Meteorology and Hydrology</a></li> <li><a href="/wiki/European_Centre_for_Medium-Range_Weather_Forecasts" title="European Centre for Medium-Range Weather Forecasts">European Centre for Medium-Range Weather Forecasts</a></li> <li><a href="/wiki/European_Severe_Storms_Laboratory" title="European Severe Storms Laboratory">European Severe Storms Laboratory</a></li></ul></li> <li>Global: <a href="/wiki/World_Meteorological_Organization" title="World Meteorological Organization">World Meteorological Organization</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><style data-mw-deduplicate="TemplateStyles:r1038841319">.mw-parser-output .tooltip-dotted{border-bottom:1px dotted;cursor:help}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"></div><div role="navigation" class="navbox authority-control" aria-labelledby="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q1066823#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q1066823#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" style="font-size:114%;margin:0 4em"><a href="/wiki/Help:Authority_control" title="Help:Authority control">Authority control databases</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q1066823#identifiers" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">International</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://isni.org/isni/0000000404329209">ISNI</a></span><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://isni.org/isni/0000000110126297">2</a></span></li></ul></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://viaf.org/viaf/92152138637010981943">VIAF</a></span><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://viaf.org/viaf/137807036">2</a></span></li></ul></li><li><span class="uid"><a rel="nofollow" class="external text" href="http://id.worldcat.org/fast/530157/">FAST</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">National</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/113778-5">Germany</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/n79018357">United States</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb15166463q">France</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://data.bnf.fr/ark:/12148/cb15166463q">BnF data</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://nla.gov.au/anbd.aut-an35570147">Australia</a></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Spojené státy americké. National Weather Service"><a rel="nofollow" class="external text" href="https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=ko2003204691&CON_LNG=ENG">Czech Republic</a></span></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="http://katalog.nsk.hr/F/?func=direct&doc_number=000741751&local_base=nsk10">Croatia</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://lod.nl.go.kr/resource/KAB202015938">Korea</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://dbn.bn.org.pl/descriptor-details/9810702068605606">Poland</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="http://olduli.nli.org.il/F/?func=find-b&local_base=NLX10&find_code=UID&request=987007269256005171">Israel</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Academics</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://ci.nii.ac.jp/author/DA16500840?l=en">CiNii</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://trove.nla.gov.au/people/999532">Trove</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://www.idref.fr/265367751">IdRef</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://catalog.archives.gov/id/10528855">NARA</a></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="United States. National Weather Service"><a rel="nofollow" class="external text" href="https://snaccooperative.org/ark:/99166/w6p60fcd">SNAC</a></span></span><ul><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="United States. Dept. of Commerce. National Weather Service"><a rel="nofollow" class="external text" href="https://snaccooperative.org/ark:/99166/w6zh54m9">2</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="United States. Weather Service."><a rel="nofollow" class="external text" href="https://snaccooperative.org/ark:/99166/w65x7jzh">3</a></span></span></li></ul></li></ul></div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=National_Weather_Service&oldid=1259209390">https://en.wikipedia.org/w/index.php?title=National_Weather_Service&oldid=1259209390</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:National_Weather_Service" title="Category:National Weather Service">National Weather Service</a></li><li><a href="/wiki/Category:Government_agencies_established_in_1870" title="Category:Government agencies established in 1870">Government agencies established in 1870</a></li><li><a href="/wiki/Category:Organizations_based_in_Maryland" title="Category:Organizations based in Maryland">Organizations based in Maryland</a></li><li><a href="/wiki/Category:1870_establishments_in_the_United_States" title="Category:1870 establishments in the United States">1870 establishments in the United States</a></li><li><a href="/wiki/Category:Silver_Spring,_Maryland" title="Category:Silver Spring, Maryland">Silver Spring, Maryland</a></li><li><a href="/wiki/Category:Weather_forecasting" title="Category:Weather forecasting">Weather forecasting</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Pages_using_gadget_WikiMiniAtlas" title="Category:Pages using gadget WikiMiniAtlas">Pages using gadget WikiMiniAtlas</a></li><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_matches_Wikidata" title="Category:Short description matches Wikidata">Short description matches Wikidata</a></li><li><a href="/wiki/Category:Use_mdy_dates_from_September_2018" title="Category:Use mdy dates from September 2018">Use mdy dates from September 2018</a></li><li><a href="/wiki/Category:Coordinates_not_on_Wikidata" title="Category:Coordinates not on Wikidata">Coordinates not on Wikidata</a></li><li><a href="/wiki/Category:Articles_needing_additional_references_from_October_2014" title="Category:Articles needing additional references from October 2014">Articles needing additional references from October 2014</a></li><li><a href="/wiki/Category:All_articles_needing_additional_references" title="Category:All articles needing additional references">All articles needing additional references</a></li><li><a href="/wiki/Category:All_articles_with_unsourced_statements" title="Category:All articles with unsourced statements">All articles with unsourced statements</a></li><li><a href="/wiki/Category:Articles_with_unsourced_statements_from_January_2024" title="Category:Articles with unsourced statements from January 2024">Articles with unsourced statements from January 2024</a></li><li><a href="/wiki/Category:Commons_category_link_from_Wikidata" title="Category:Commons category link from Wikidata">Commons category link from Wikidata</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 23 November 2024, at 23:35<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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