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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Weather Prediction Center (WPC) Home Page</title> <meta name="DC.title" content="Weather Prediction Center (WPC) Home Page"> <meta name="DC.description" content="Weather Prediction Center's (WPC) Home Page"> <meta name="DC.subject" content="Weather Prediction Center's (WPC) Home Page"> <meta name="DC.creator" content="NOAA's National Weather Service"> <meta name="DC.date.created" scheme="ISO8601" content="2002-01-01"> <meta name="DC.date.reviewed" scheme="ISO8601" content="2005-12-12"> <meta name="DC.language" scheme="DCTERMS.RFC1766" content="EN-US"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">  <meta content="NCEP Web Team" name="GENERATOR">  <link href="nwscwi/main.css" type="text/css" rel="STYLESHEET"> <link rel="icon" href="/favicon.ico"> <link rel="alternate" type="application/rss+xml" title="WPC Mesoscale Precipitation Discussions" 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href="/para/para_includes/WPC_Student_Opportunities.pdf">Student Opportunities</a></li> </ul> </div> </li> <li> <div class="center-section-link">  <a href="https://www.weather.gov/search">Search</a> </div> <div class="dropsearch"> <div class="site-search"> <form method="get" action="https://search.usa.gov/search" style="margin-bottom: 0; margin-top: 0;"> <input type="hidden" name="v:project" value="firstgov" /> <label for="query">Search For</label> <input type="text" name="query" id="query" size="12" /> <input type="submit" value="Go" /> <p> <input type="radio" name="affiliate" checked="checked" value="nws.noaa.gov" id="nws" /> <label for="nws" class="search-scope">NWS</label> <input type="radio" name="affiliate" value="noaa.gov" id="noaa" /> <label for="noaa" class="search-scope">All NOAA</label> </p> </form> </div> </div> </li> </ul> </div>    <div id="hazards" class="haz-content"> <a name="contents"></a> <div class="haz-border"> <div class="haz-wrn"> <a href='http://www.nws.noaa.gov/com/weatherreadynation/' title='Weather Ready Nation'><img class='haz-wrn-logo' src='/para/css/images/WRN_emblem_small.png' alt='Weather Ready Nation' /></a> </div> <div class="haz-one"> <table class="haz-one-table" summary="table that displays the WPC Hazards (Day 1, Day 2, and Day 3) for Excessive Rainfall, Heavy Snow, and Freezing Rain"> <thead> <tr> <th id='hz-hazards'>Hazard</th> <th id='hz-dayone'>Nov 27</th><th id='hz-daytwo'>Nov 28</th><th id='hz-daythree'>Nov 29</th> </tr> </thead> <tbody> <tr class="odd"> <td headers='hz-hazards'>Excessive Rainfall</td> <td headers='hz-dayone' title='There are No Risk Areas of Excessive Rainfall on Day 1' class='threats'><a href='/qpf/ero.php?opt=curr&day=1' target='_blank'>No Area</a></td><td headers='hz-daytwo' title='There are No Risk Areas of Excessive Rainfall on Day 2' class='threats'><a href='/qpf/ero.php?opt=curr&day=2' target='_blank'>No Area</a></td><td headers='hz-daythree' title='There are No Risk Areas of Excessive Rainfall on Day 3' class='threats'><a href='/qpf/ero.php?opt=curr&day=3' target='_blank'>No Area</a></td> </tr> <tr><td headers='hz-hazards'>Heavy Snow (≥ 4”)</td><td headers='hz-dayone' title='There is a High Risk of Snow Accumulations ≥ 4” on Day 1' class='high'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=1&ftype=probabilities' target='_blank'>High</a></td><td headers='hz-daytwo' title='There is a High Risk of Snow Accumulations ≥ 4” on Day 2' class='high'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=2&ftype=probabilities' target='_blank'>High</a></td><td headers='hz-daythree' title='There is a High Risk of Snow Accumulations ≥ 4” on Day 3' class='high'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=3&ftype=probabilities' target='_blank'>High</a></td></tr><tr class='odd'> <td headers='hz-hazards'>Ice (≥ 0.25”)</td><td headers='hz-dayone' title='There are No Risk Areas of Ice Accumulations ≥ 0.25” on Day 1' class='threats'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=icez&amt=1&day=1&ftype=probabilities' target='_blank'>No Area</a></td><td headers='hz-daytwo' title='There are No Risk Areas of Ice Accumulations ≥ 0.25” on Day 2' class='threats'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=icez&amt=1&day=2&ftype=probabilities' target='_blank'>No Area</a></td><td headers='hz-daythree' title='There are No Risk Areas of Ice Accumulations ≥ 0.25” on Day 3' class='threats'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=icez&amt=1&day=3&ftype=probabilities' target='_blank'>No Area</a></td></tr> </tbody> </table> </div> <div class="haz-two"> <table class="haz-two-table" summary="table that displays WPC/CPC hazards for Days 4-7">  <tr class="odd">  <td class="threats" headers='hz-day47'> <div style="margin-left:2em;margin-right:2em;"> <a href="/threats/threats.php" style="background:#7FFF7F;">WPC's Medium Range Hazards Forecast</a> <div style="line-height:75%;"> <div> <a href="/wwd/wssi/wssi.php" style="background:#7FFF7F;">Winter Storm Severity Index</a> <div style="line-height:75%;"> <div> <a href="https://www.wpc.ncep.noaa.gov/heatrisk" style="background:#7FFF7F;">Experimental HeatRisk</a> </div> </td> </tr> </tbody> </table> </div> <div class="haz-question"> <div><a title="More About WPC's Hazards Table" target="_blank" href='/para/para_includes/WPC_Hazards_Table.pdf'><img class="question" src="../para/para_css/images/question.png" height="18"></img></a></div> </div> </div> </div>   <div class="product-body"> <div id='product' class='product-tabs-container'>  <ul id="toc" class="product-tabs"> <li><a href="#ovw" title="national overview"><span>Overview</span></a></li> <li><a href="#sfc" title="surface analysis"><span>Surface Analysis</span></a></li> <li><a href="#frt" title="fronts and pressures through day 7"><span>Fronts</span></a></li> <li><a href="#qpf" title="quantitative precipitation forecasts"><span>QPF</span></a></li> <li><a href="#ero" title="rainfall exceeding flash flood guidance"><span>Excessive Rain</span></a></li> <li><a href="#wwx" title="winter weather forecasts"><span>Winter Wx</span></a></li> <li><a href="#med" title="medium range forecasts (day 3-7)"><span>Day 3–7</span></a></li> <li><a href="#tls" title="forecaster toolbox"><span>Forecast Tools</span></a></li> </ul>  <div id='container' class='product-container'> <div class="product-content"> <div class="product-content-new" id="ovw">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviewo:focus").closest('li').next().find('a.overviewo').focus(); } if (e.keyCode == 37) { $(".overviewo:focus").closest('li').prev().find('a.overviewo').focus(); } } ); $(function() { $('#firsto').focus(); }); </script> <div id='content-ovw' class='display-content-max-h'> <div class='display-overview-h'> <div class='display-text'> <div class="display-title">National Forecast Chart</div> <div id='TABday1S-ovw' style='display: block' class='display-validtime'><br>Valid Wed Nov 27, 2024</div><div id='TABday2S-ovw' style='display: none' class='display-validtime'><br>Valid Thu Nov 28, 2024</div><div id='TABday3S-ovw' style='display: none' class='display-validtime'><br>Valid Fri Nov 29, 2024</div>    <div class="navbar" id="fordays"> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('ovw','TABday1','3')" class="overviewo" onfocus="show_tab('ovw','TABday1','3')" id="firsto" alt="Day1"><span id="TABday1T-ovw" class="active-forecast">Day 1</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('ovw','TABday2','3')" class="overviewo" onfocus="show_tab('ovw','TABday2','3')" alt="Day2"><span id="TABday2T-ovw" class="blank">Day 2</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('ovw','TABday3','3')" class="overviewo" onfocus="show_tab('ovw','TABday3','3')" alt="Day3"><span id="TABday3T-ovw" class="blank">Day 3</span></a></li> </ul> </div> </div>  <div id= "options-wrapper" class="options-wrapper"> <div id="options-tab-ovw" class="options-off"> <div class="options-container"> <div class="options-inner1"> <a onclick="javascript:displayoptions('ovw');" href="javascript:;"><img class="options-icon" alt="options" src="para/para_css/images/options.png" /></a> </div> <div id="opts-ovw" class="options-inner2" style="display: none"> Image Format: <div class="options-form"> <form> <input id="ovw-eng" type="radio" name="format" value="english" onclick="javascript:imgformat('eng');" checked ><label for="ovw-eng">English</label> <a id="TABday1F" href="/noaa/noaad1.pdf" style="display: inline">(PDF)</a> <a id="TABday2F" href="/noaa/noaad2.pdf" style="display: none">(PDF)</a> <a id="TABday3F" href="/noaa/noaad3.pdf" style="display: none">(PDF)</a> <br> <input id="ovw-esp" type="radio" name="format" value="spanish" onclick="javascript:imgformat('esp');"><label for="ovw-esp">Español</label> <a id="TABday1EF" href="/noaa/sp_noaad1.pdf" style="display: inline">(PDF)</a> <a id="TABday2EF" href="/noaa/sp_noaad2.pdf" style="display: none">(PDF)</a> <a id="TABday3EF" href="/noaa/sp_noaad3.pdf" style="display: none">(PDF)</a> <br> </form> </div> <div class='options-form2'><a href="/NationalForecastChart/map.php" target="_blank">Interactive Map</a></div> </div> </div> </div> </div>   <div> <div id="TABday1G-ovw" style="display:block;"> <a href="/NationalForecastChart/map.php"> <img class='display-img-ove' src='/NationalForecastChart/staticmaps/noaad1.png' id='ovwimg1' alt='Day 1 image not available'> </a> </div> <div id="TABday2G-ovw" style="display:none;"> <a href="/NationalForecastChart/map.php"> <img class='display-img-ove' src='/NationalForecastChart/staticmaps/noaad2.png' id='ovwimg2' alt='Day 2 image not available'> </a> </div> <div id="TABday3G-ovw" style="display:none;"> <a href="/NationalForecastChart/map.php"> <img class='display-img-ove' src='NationalForecastChart/staticmaps/noaad3.png' id='ovwimg3' alt='Day 3 image not available'> </a> </div> </div>  <div id='links-ovw' class='links-ove'>  <a href="/NationalForecastChart/map.php" target="_blank" class="linksmajor"> » Interactive National Forecast Chart</a><br> <a onclick="javascript:displaylinks('dlinks-ovw')" href="javascript:;"> + Additional Links</a> <div id="dlinks-ovw" style="display: none"> <ul class="linkslist"> <li>» <a href="/html/about_Gudes.shtml" alt="Product Description">Description of the National Forecast Chart</a></li> <li>» <a href="/noaa/noaa_archive.php?reset=yes" alt="Product Archives">Product Archives</a></li> <li>» Download hazards in <a href="/kml/kmlproducts.php#sigwx" alt="KML">KML</a> or <a href="https://ftp.wpc.ncep.noaa.gov/shapefiles/noaa_chart/" alt="shapefile">shapefile format</a> or <a href="/NationalForecastChart/mapdata/" alt="GeoJSON">GeoJSON format</a></li> </ul> </div> </div> </div> <div class='display-headlines'>  <div class='display-title-headline'> WPC Top Stories: </div>  <div class='news-list'> <a href='./key_messages/LatestKeyMessage_1.png' target='_blank'><div class='news-list-border'><img id='highlightimg' class='news-logo-img-yes' src='./key_messages/LatestKeyMessage_1.png' alt='headline0' /><br>Latest Key Messages for Thanksgiving Weekend Arctic Blast </div></a><a href='https://www.wpc.ncep.noaa.gov/Prob_Precip/' target='_blank'><div class='news-list-border'><img id='highlightimg' class='news-logo-img-yes' src='/para/images/ppp.png' alt='headline1' /><br>Explore WPC's experimental Probabilistic Precipitation Portal</div></a><a href='/para/para_images/ERO_Categories.png' target='_blank'><div class='news-list-border'><img id='highlightimg' class='news-logo-img-yes' src='/para/para_images/ERO_Categories.png' alt='headline2' /><br>Understanding WPC's Excessive Rainfall Risk Categories</div></a><a href='/wwd/wssi/wssi.php' target='_blank'><div class='news-list-border'><img id='highlightimg' class='news-logo-img-yes' src='/wwd/wssi/images/WSSI_Overall_CONUS.png' alt='headline3' /><br>View the Winter Storm Severity Index to see potential impacts from winter weather</div></a> </div> </div> </div> </div> <div class="product-content-new" id="sfc">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviews:focus").closest('li').next().find('a.overviews').focus(); } if (e.keyCode == 37) { $(".overviews:focus").closest('li').prev().find('a.overviews').focus(); } } ); $(function() { $('#firsts').focus(); }); </script> <div id='content-sfc' class='display-content-max'> <div class='display-text'> <div class="display-title">North American Surface Analysis <a href="html/sfc2.shtml" alt="Legacy Page" class="legacy-link">Legacy Page</a>:</div> <div id='TABday1S-sfc' style='display: none' class='display-validtime'>Analyzed at 15Z Tue Nov 26, 2024</div><div id='TABday2S-sfc' style='display: none' class='display-validtime'>Analyzed at 18Z Tue Nov 26, 2024</div><div id='TABday3S-sfc' style='display: none' class='display-validtime'>Analyzed at 21Z Tue Nov 26, 2024</div><div id='TABday4S-sfc' style='display: none' class='display-validtime'>Analyzed at 00Z Wed Nov 27, 2024</div><div id='TABday5S-sfc' style='display: none' class='display-validtime'>Analyzed at 03Z Wed Nov 27, 2024</div><div id='TABday6S-sfc' style='display: none' class='display-validtime'>Analyzed at 06Z Wed Nov 27, 2024</div><div id='TABday7S-sfc' style='display: none' class='display-validtime'>Analyzed at 09Z Wed Nov 27, 2024</div><div id='TABday8S-sfc' style='display: none' class='display-validtime'>Analyzed at 12Z Wed Nov 27, 2024</div><div id='TABday9S-sfc' style='display: block' class='display-validtime'>Analyzed at 15Z Wed Nov 27, 2024</div>    <div class="navbar" id="fordays"> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday1','9')" class="overviews" onfocus="show_tab('sfc','TABday1','9')" alt="Day1"><span id="TABday1T-sfc" class="blank">-24 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday2','9')" class="overviews" onfocus="show_tab('sfc','TABday2','9')" alt="Day2"><span id="TABday2T-sfc" class="blank">-21 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday3','9')" class="overviews" onfocus="show_tab('sfc','TABday3','9')" alt="Day3"><span id="TABday3T-sfc" class="blank">-18 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday4','9')" class="overviews" onfocus="show_tab('sfc','TABday4','9')" alt="Day4"><span id="TABday4T-sfc" class="blank">-15 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday5','9')" class="overviews" onfocus="show_tab('sfc','TABday5','9')" alt="Day5"><span id="TABday5T-sfc" class="blank">-12 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday6','9')" class="overviews" onfocus="show_tab('sfc','TABday6','9')" alt="Day6"><span id="TABday6T-sfc" class="blank">-9 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday7','9')" class="overviews" onfocus="show_tab('sfc','TABday7','9')" alt="Day7"><span id="TABday7T-sfc" class="blank">-6 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday8','9')" class="overviews" onfocus="show_tab('sfc','TABday8','9')" alt="Day8"><span id="TABday8T-sfc" class="blank">-3 hr</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('sfc','TABday9','9')" class="overviews" onfocus="show_tab('sfc','TABday9','9')" id="firsts" alt="Day9"><span id="TABday9T-sfc" class="active-forecast">latest</span></a></li> </ul> </div> </div>  <div id= "options-wrapper" class="options-wrapper"> <div id="options-tab-sfc" class="options-off"> <div class="options-container"> <div class="options-inner1"> <a onclick="javascript:displayoptions('sfc');" href="javascript:;"><img class="options-icon" src="para/para_css/images/options.png" alt="options"/></a> </div> <div id="opts-sfc" class="options-inner2" style="display: none"> Image Format: <div class="options-form"> <form> <input id="sfc-std" type="radio" name="format" value="standard" onclick="javascript:imgformatsfc('namussfc');" checked ><label for="sfc-std">Standard</label> <br> <input id="sfc-sat" type="radio" name="format" value="satellite" onclick="javascript:imgformatsfc('ussatsfc');"><label for="sfc-sat">Satellite Composite</label> <br> <input id="sfc-rad" type="radio" name="format" value="radar" onclick="javascript:imgformatsfc('radsfcus_exp_new');"><label for="sfc-rad">Radar Composite</label> <br> <input id="sfc-baw" type="radio" name="format" value="blckwhite" onclick="javascript:imgformatsfc('bw');"><label for="sfc-baw">Black and White</label> <br> <input id="sfc-frt" type="radio" name="format" value="fronts" onclick="javascript:imgformatsfc('usfntsfc');"><label for="sfc-frt">Fronts Only</label> <br>  </form> </div> <div class='options-form2'><a href="/html/sfc-zoom.php" target="_blank">Interactive Map</a></div> </div> </div> </div> </div>  <script> function imgformatsfc(nam) { //get info from php variables var numprod = 9; var maphours = ["15","18","21","00","03","06","09","12","15"]; var oldimgsrc = ["\/archives\/sfc\/2024\/namussfc2024112615.gif","\/sfc\/namussfc18wbg.gif","\/sfc\/namussfc21wbg.gif","\/sfc\/namussfc00wbg.gif","\/sfc\/namussfc03wbg.gif","\/sfc\/namussfc06wbg.gif","\/sfc\/namussfc09wbg.gif","\/sfc\/namussfc12wbg.gif","\/sfc\/namussfc15wbg.gif"]; //info to grab from archives var ayear = "2024"; var afilename = "2024112615"; //get new sources for selected sfc image var ndirectory = 'https://www.wpc.ncep.noaa.gov/sfc'; var narcdirectory = 'https://www.wpc.ncep.noaa.gov/archives/sfc'; var newimgsrc = new Array(); for (i = 0; i < numprod; i++) { if (nam == 'namussfc') { // user selects 'standard' newimgsrc[i] = ndirectory + '/' + nam + maphours[i] + 'wbg.gif'; //if map is from -24hrs, need to grab it from archives if (i == 0) { newimgsrc[i] = narcdirectory + '/' + ayear + '/' + nam + afilename + '.gif'; } } else if (nam == 'bw') { //user selects 'black and white' newimgsrc[i] = ndirectory + '/' + 'print_us' + maphours[i] + nam + '.gif'; //if map is from -24hrs, need to grab it from archives if (i == 0) { newimgsrc[i] = narcdirectory + '/' + ayear + '/' + 'print_us' + afilename + '.gif'; } } else if (nam == 'usfntsfc') { //user selects 'fronts only' newimgsrc[i] = ndirectory + '/' + nam + maphours[i] + 'wbg.gif'; //if map is from -24hrs, need to grab it from archives if (i == 0) { newimgsrc[i] = narcdirectory + '/' + ayear + '/' + nam + afilename + '.gif'; } } else { newimgsrc[i] = ndirectory + '/' + nam + maphours[i] + '.gif'; //if map is from -24hrs, need to grab it from archives if (i == 0) { newimgsrc[i] = narcdirectory + '/' + ayear + '/' + nam + afilename + '.gif'; } } //change image source var idnum = i + 1; var sfcid = 'sfcimg' + idnum ; document.getElementById(sfcid).src = newimgsrc[i]; } // alert(newimgsrc[3]); } </script>  <div> <div id='TABday1G-sfc' style='display:none;'><img class='display-img-max' src='/archives/sfc/2024/namussfc2024112615.gif' id='sfcimg1' alt='Day 1 image not available'></div><div id='TABday2G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc18wbg.gif' id='sfcimg2' alt='Day 2 image not available'></div><div id='TABday3G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc21wbg.gif' id='sfcimg3' alt='Day 3 image not available'></div><div id='TABday4G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc00wbg.gif' id='sfcimg4' alt='Day 4 image not available'></div><div id='TABday5G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc03wbg.gif' id='sfcimg5' alt='Day 5 image not available'></div><div id='TABday6G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc06wbg.gif' id='sfcimg6' alt='Day 6 image not available'></div><div id='TABday7G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc09wbg.gif' id='sfcimg7' alt='Day 7 image not available'></div><div id='TABday8G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc12wbg.gif' id='sfcimg8' alt='Day 8 image not available'></div><div id='TABday9G-sfc' style='display:block;'><img class='display-img-max' src='/sfc/namussfc15wbg.gif' id='sfcimg9' alt='Day 9 image not available'></div> </div>  <div id='links-sfc' class='links-max'> <a href="/html/sfc-zoom.php" target="_blank" class="linksmajor"> » Interactive Surface Map</a><br> <a href="https://ocean.weather.gov/unified_analysis.php" target="_blank"> » NWS Unified Surface Analysis</a><br> <a onclick="javascript:displaylinks('dlinks-sfc')" href="javascript:;"> + Additional Links</a> <div id="dlinks-sfc" style="display: none"> <ul class="linkslist"> <li>» <a href="/archives/web_pages/sfc/sfc_archive.php" alt="Product Archives">Product Archives</a></li> <li>» <a href="/sfc/UASfcManualVersion1.pdf" alt="Product Info">NWS Unified Surface Analysis Manual</a></li> <li>» <a href="/html/sfc2.shtml" alt="Other Products">Other Surface Analysis Products</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="frt">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviewf:focus").closest('li').next().find('a.overviewf').focus(); } if (e.keyCode == 37) { $(".overviewf:focus").closest('li').prev().find('a.overviewf').focus(); } } ); $(function() { $('#firstf').focus(); }); </script> <div id='content-frt' class='display-content-max'> <div class='display-text'> <div class="display-title">Surface Fronts and Sea-Level Pressures <a href="basicwx/basicwx_ndfd.php" alt="Legacy Page" class="legacy-link">Legacy Page</a>:</div> <div id='TABday1S-frt' style='display: block' class='display-validtime'>Analyzed 15Z Wed Nov 27, 2024</div><div id='TABday2S-frt' style='display: none' class='display-validtime'>Valid 00Z Thu Nov 28, 2024</div><div id='TABday3S-frt' style='display: none' class='display-validtime'>Valid 06Z Thu Nov 28, 2024</div><div id='TABday4S-frt' style='display: none' class='display-validtime'>Valid 12Z Thu Nov 28, 2024</div><div id='TABday5S-frt' style='display: none' class='display-validtime'>Valid 18Z Thu Nov 28, 2024</div><div id='TABday6S-frt' style='display: none' class='display-validtime'>Valid 00Z Fri Nov 29, 2024</div><div id='TABday7S-frt' style='display: none' class='display-validtime'>Valid 12Z Fri Nov 29, 2024</div><div id='TABday8S-frt' style='display: none' class='display-validtime'>Valid 00Z Sat Nov 30, 2024</div><div id='TABday9S-frt' style='display: none' class='display-validtime'>Valid 12Z Sat Nov 30, 2024</div><div id='TABday10S-frt' style='display: none' class='display-validtime'>Valid 12Z Sun Dec 01, 2024</div><div id='TABday11S-frt' style='display: none' class='display-validtime'>Valid 12Z Mon Dec 02, 2024</div><div id='TABday12S-frt' style='display: none' class='display-validtime'>Valid 12Z Tue Dec 03, 2024</div><div id='TABday13S-frt' style='display: none' class='display-validtime'>Valid 12Z Wed Dec 04, 2024</div>    <div class="navbar" id="fordays"> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday1','13')" class="overviewf" onfocus="show_tab('frt','TABday1','13')" id="firstf" alt="Day1"><span id="TABday1T-frt" class="active-forecast">15ZWed</span></a></li><li class="cforday"><span class='nav-vline'> </span><a href="#" OnMouseOver="show_tab('frt','TABday2','13')" class="overviewf" onfocus="show_tab('frt','TABday2','13')" alt="Day2"><span id="TABday2T-frt" class="blank">00ZThu</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday3','13')" class="overviewf" onfocus="show_tab('frt','TABday3','13')" alt="Day3"><span id="TABday3T-frt" class="blank">06ZThu</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday4','13')" class="overviewf" onfocus="show_tab('frt','TABday4','13')" alt="Day4"><span id="TABday4T-frt" class="blank">12ZThu</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday5','13')" class="overviewf" onfocus="show_tab('frt','TABday5','13')" alt="Day5"><span id="TABday5T-frt" class="blank">18ZThu</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday6','13')" class="overviewf" onfocus="show_tab('frt','TABday6','13')" alt="Day6"><span id="TABday6T-frt" class="blank">00ZFri</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday7','13')" class="overviewf" onfocus="show_tab('frt','TABday7','13')" alt="Day7"><span id="TABday7T-frt" class="blank">12ZFri</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday8','13')" class="overviewf" onfocus="show_tab('frt','TABday8','13')" alt="Day8"><span id="TABday8T-frt" class="blank">00ZSat</span></a></li><li class="cforday"><span class='nav-vline'> </span><a href="#" OnMouseOver="show_tab('frt','TABday9','13')" class="overviewf" onfocus="show_tab('frt','TABday9','13')" alt="Day9"><span id="TABday9T-frt" class="blank">12ZSat</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday10','13')" class="overviewf" onfocus="show_tab('frt','TABday10','13')" alt="Day10"><span id="TABday10T-frt" class="blank">12ZSun</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday11','13')" class="overviewf" onfocus="show_tab('frt','TABday11','13')" alt="Day11"><span id="TABday11T-frt" class="blank">12ZMon</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday12','13')" class="overviewf" onfocus="show_tab('frt','TABday12','13')" alt="Day12"><span id="TABday12T-frt" class="blank">12ZTue</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday13','13')" class="overviewf" onfocus="show_tab('frt','TABday13','13')" alt="Day13"><span id="TABday13T-frt" class="blank">12ZWed</span></a></li> </ul> </div> </div>    <div> <div id='TABday1G-frt' style='display:block;'><img class='display-img-max' src='../sfc/usfntsfc15wbg.gif' id='frtimg1' alt='Day 1 image not available'></div><div id='TABday2G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/92fndfd_init_2024112712.gif ' id='frtimg2' alt='Day 2 image not available'></div><div id='TABday3G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/93fndfd_init_2024112712.gif ' id='frtimg3' alt='Day 3 image not available'></div><div id='TABday4G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/94fndfd_init_2024112712.gif ' id='frtimg4' alt='Day 4 image not available'></div><div id='TABday5G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/95fndfd_init_2024112712.gif ' id='frtimg5' alt='Day 5 image not available'></div><div id='TABday6G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/96fndfd_init_2024112712.gif ' id='frtimg6' alt='Day 6 image not available'></div><div id='TABday7G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/98fndfd_init_2024112712.gif ' id='frtimg7' alt='Day 7 image not available'></div><div id='TABday8G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/99fndfd_init_2024112712.gif ' id='frtimg8' alt='Day 8 image not available'></div><div id='TABday9G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf072.gif' id='frtimg9' alt='Day 9 image not available'></div><div id='TABday10G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf096.gif' id='frtimg10' alt='Day 10 image not available'></div><div id='TABday11G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf120.gif' id='frtimg11' alt='Day 11 image not available'></div><div id='TABday12G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf144.gif' id='frtimg12' alt='Day 12 image not available'></div><div id='TABday13G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf168.gif' id='frtimg13' alt='Day 13 image not available'></div> </div>  <div id='links-frt' class='links-max'> <a onclick="javascript:displaylinks('dlinks-frtsr-disco')" href="javascript:;"> + Short Range Forecast Discussion (Day ½-2½)</a><br> <div id="dlinks-frtsr-disco" style="display: none"> <div class="dlinks-disco"> Short Range Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>1209 PM EST Wed Nov 27 2024 <br> <br>Valid 00Z Thu Nov 28 2024 - 00Z Sat Nov 30 2024 <br> <br>...Thanksgiving Day storm to push from the Mid Mississippi/Ohio Valley <br>today into the Northeast on Thursday spreading rainfall and New England <br>snowfall in its vicinity... <br> <br>...Increasingly below average temperatures spill out into the Great Plains <br>and Mississippi Valley through the end of the week... <br> <br>...Lake Effect snows continue and will expand and intensify with time... <br> <br>A dynamic mid-latitude cyclone tracks through the Mississippi Valley, <br>Tennessee Valley, Upper Ohio Valley, and near the New England coast <br>through Thanksgiving day. Scattered showers and thunderstorms spread into <br>the East Coast tonight and progressively shift eastward. A swath of <br>moderate to heavy snowfall is likely to develop across portions of the <br>interior Northeast -- winter storm watches are in effect for portions of <br>central New England related to the heavy snow threat. <br> <br>Elsewhere, Lake Effect snow showers across the Upper Great Lakes may yield <br>anywhere from 4-8 inches over the northern coastline of the Upper <br>Peninsula of Michigan as well as northern parts of the Lower Peninsula. A <br>disturbance aloft will allow for the development of a new cold front late <br>on Thanksgiving which moves east and south ahead of a strong and cold <br>surface high. In the wake of this front, as temperatures cool further, <br>lake effect snows should expand and intensify as they interact with record <br>warm Great Lakes temperatures for so late November. Florida will remain <br>mild to warm. <br> <br>Roth <br> <br> <br>Graphics available at <br><a href="https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php"><u><a href="https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php" target="_blank">https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php</a></u></a> <br> </div> </div> <a onclick="javascript:displaylinks('dlinks-frtmr-disco')" href="javascript:;"> + Medium Range Forecast Discussion (Day 3-7)</a><br> <div id="dlinks-frtmr-disco" style="display: none"> <div class="dlinks-disco"> Extended Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>135 PM EST Wed Nov 27 2024 <br> <br>Valid 12Z Sat Nov 30 2024 - 12Z Wed Dec 04 2024 <br> <br>...Arctic cold will spread across the northern Plains with below <br>normal temperatures reaching most areas east of the Rockies... <br> <br>...Multiple days of heavy lake effect snow this weekend into next <br>week... <br> <br> <br>...Overview... <br> <br>A large scale upper trough is expected to encompass much of the <br>central to eastern United States over the weekend, with some very <br>gradual shift east as next week progresses. This pattern with <br>west/northwest winds will become favorable for long duration lake <br>effect snow. Some of the snowfall accumulations could be <br>significant in favored locations. The trough aloft and cold surface <br>high pressure stemming from the Arctic will cause temperatures to <br>drop well below average across much of the country east of the <br>Rockies. This will be the coldest air of the season so far, with <br>temperatures falling into the negative teens and wind chills in the <br>-20s in North Dakota Saturday morning. Meanwhile benign weatherand <br> more moderate temperatures are forecast for the West. <br> <br> <br>...Guidance/Predictability Assessment... <br> <br>The guidance continues to show good agreement on the large scale <br>pattern across the CONUS into next week. Some smaller scale <br>features embedded within the mean flow could have impacts on <br>sensible weather, but are also much less predictable at later time <br>scales. This includes multiple shortwaves tracking through the <br>western and southern sides of the trough that could provide forcing <br>for light snow events, lake effect snow enhancement, or just help <br>determine where the frontal position will be. By Tuesday-Wednesday <br>the models differ with the strength of a shortwave exiting into the <br>western Atlantic and also with how much energy comes south from <br>central Canada. Elsewhere, split flow will prevail across the <br>eastern Pacific to western U.S., as northern stream ridging comes <br>across the Pacific Northwest, while a couple rounds of southern <br>stream troughing nudges toward California. Across the entire CONUS <br>though, a general model blend seems to suffice to help smooth some <br>of the less predictable details. Was able to blend the operational <br>guidance the first half of the period, bringing in up to half <br>ensemble means by day 7. Overall, maintained very good agreement <br>with the previous WPC forecast. <br> <br> <br>...Weather/Hazards Highlights... <br> <br>As a pronounced upper trough settles over the central and eastern <br>U.S., a significant Arctic air intrusion in the form of a cold <br>surface high will spread from the northern Plains southeastward <br>into the weekend. This event does not look to break many <br>temperature records nor is it particularly early in the season for <br>the first Arctic airmass. However, the cold will be a noticeable <br>change in many areas, and for some across the northern Plains, <br>potentially dangerous cold temperatures are expected. Overnight <br>lows in the negative teens could combine with wind to bring wind <br>chills down into the -20s, approaching -30F, in North Dakota in <br>particular for the weekend. This will pose an increased risk of <br>hypothermia and frostbite on exposed skin, so take appropriate <br>preparedness actions. Highs are forecast to remain in the single <br>digits and teens. Temperatures are likely to gradually moderate <br>across the north-central U.S. and reach average values by midweek. <br> <br>Meanwhile the cold will spread farther southeast in moderated <br>form, reaching most areas east of the Rockies across the <br>Mississippi Valley, Ohio/Tennessee Valleys, and toward the <br>Appalachians and Eastern Seaboard. A handful of record low max and <br>min temperatures are possible across the Ohio Valley into the <br>Appalachians, where temperatures are forecast to be around 15-20F <br>below average and stay below freezing for highs in many areas. By <br>Tuesday-Wednesday the coldest air will migrate over the East with <br>temperatures generally 10-15 degrees below normal as the upper <br>trough axis slowly shifts east. <br> <br>Heavy lake-effect snow is expected through much of the period, as <br>westerly flow develops snow east of the lakes through Saturday, and <br>winds may shift to a more northwesterly direction into early next <br>week for a snow focus southeast of the lakes Sunday-Tuesday. <br>Significant accumulations are possible for some of the favored lake <br>effect locations. While specific accumulations will become clearer <br>over the next few days, peak amounts are likely downwind of Lake <br>Erie and Lake Ontario. Travel disruptions are likely especially on <br>I-90 between Cleveland and Buffalo and I-81 north of Syracuse. <br> <br>Elsewhere, a quieter period is likely for the West precipitation- <br>wise. Light to locally modest precipitation is possible at times in <br>the Pacific Northwest into the northern Rockies. Expect <br>temperatures in the Rockies westward to be near average late this <br>week and warm to a few degrees above normal into early next week. <br>Models continue to show a general signal for a round of light to <br>moderate snow across parts of the north-central Plains to Mid- <br>Mississippi and Ohio Valleys Saturday, though the axis and timing <br>are somewhat uncertain depending on a shortwave aloft. Return flow <br>of moisture could start to come into the western Gulf Coast region <br>over the weekend for some shower activity, which may spread inland <br>into the south-central U.S. by Monday and Tuesday. <br> <br> <br>Santorelli/Tate <br> <br> <br>Additional 3-7 Day Hazard information can be found on the WPC <br>medium <br>range hazards outlook chart at: <br><a href="https://www.wpc.ncep.noaa.gov/threats/threats.php"><u><a href="https://www.wpc.ncep.noaa.gov/threats/threats.php" target="_blank">https://www.wpc.ncep.noaa.gov/threats/threats.php</a></u></a> <br> <br>WPC medium range 500mb heights, surface systems, weather grids, <br>quantitative precipitation forecast (QPF), excessive rainfall <br>outlook (ERO), winter weather outlook (WWO) probabilities, heat <br>indices, and Key Messages can be accessed from: <br> <br><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif"><u><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif" target="_blank">https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif"><u><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif" target="_blank">https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html"><u><a href="https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html" target="_blank">https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml"><u><a href="https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml" target="_blank">https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/#page=ero"><u><a href="https://www.wpc.ncep.noaa.gov/#page=ero" target="_blank">https://www.wpc.ncep.noaa.gov/#page=ero</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4"><u><a href="https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4" target="_blank">https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/heat_index.shtml"><u><a href="https://www.wpc.ncep.noaa.gov/heat_index.shtml" target="_blank">https://www.wpc.ncep.noaa.gov/heat_index.shtml</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/#page=ovw"><u><a href="https://www.wpc.ncep.noaa.gov/#page=ovw" target="_blank">https://www.wpc.ncep.noaa.gov/#page=ovw</a></u></a> <br> </div> </div> <a onclick="javascript:displaylinks('dlinks-frthi-disco')" href="javascript:;"> + Hawaii Forecast Discussion (Day 1-7)</a><br> <div id="dlinks-frthi-disco" style="display: none"> <div class="dlinks-disco"> <br>Hawaii Extended Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>236 AM EST Wed Nov 27 2024 <br> <br>Valid 00Z Thu Nov 28 2024 - 00Z Thu Dec 05 2024 <br> <br>Winds are forecast to continue to have a northerly component <br>Wednesday in a post-frontal environment over Hawaii. These should <br>gradually veer toward the east as a weak surface ridge sets up <br>north of the state later this week. Moisture levels will remain <br>quite low as a mid-upper high comes overhead. Trades are forecast <br>to gradually decrease in strength over the weekend, especially <br>Sunday. <br> <br>Into early next week, trades look to get disrupted as a cold front <br>approaches north of Hawaii and there is a general model signal for <br>winds to respond by turning more southerly, though perhaps weak <br>enough initially for land and sea breezes to dominate over the <br>islands. By midweek the western islands may have a greater chance <br>of seeing southerly/southwesterly winds as the front gets closer. <br>Despite the southerly flow (at least aloft), moisture levels do <br>not appear to increase significantly and the pattern may stay <br>relatively dry into much of next week. <br> <br>Tate <br> <br> <br> </div> </div> <a onclick="javascript:displaylinks('dlinks-frt')" href="javascript:;"> + Additional Links</a> <div id="dlinks-frt" style="display: none"> <ul class="linkslist"> <li>» <a href="/html/sfc2.shtml" alt="Surface Products">More Surface Analysis Products</a></li> <li>» <a href="/basicwx/basicwx_ndfd.php" alt="Short Range Products">More Short Range Products</a></li> <li>» <a href="/medr/medr.shtml" alt="Medium Range Products">More Medium Range Products</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="qpf">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> 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document.getElementById("validtimes-qpf-opt4").style.display= "none"; document.getElementById(prodval).style.display = "block"; //Change navbar document.getElementById("fordays-qpf-opt1").style.display= "none"; document.getElementById("fordays-qpf-opt2").style.display= "none"; document.getElementById("fordays-qpf-opt3").style.display= "none"; document.getElementById("fordays-qpf-opt4").style.display= "none"; document.getElementById(prodnav).style.display = "block"; //Change images document.getElementById("forimg-qpf-opt1").style.display= "none"; document.getElementById("forimg-qpf-opt2").style.display= "none"; document.getElementById("forimg-qpf-opt3").style.display= "none"; document.getElementById("forimg-qpf-opt4").style.display= "none"; document.getElementById(prodimg).style.display = "block"; } </script>  <div id="forimg-qpf-opt1" style='display:block'> <div id='TABday1G-qpf' style='display:block;'><img class='display-img-max' src='../qpf/fill_94qwbg.gif' id='qpfimg1' alt='Day 1 image not available'></div><div id='TABday2G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/fill_98qwbg.gif' id='qpfimg2' alt='Day 2 image not available'></div><div id='TABday3G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/fill_99qwbg.gif' id='qpfimg3' alt='Day 3 image not available'></div><div id='TABday4G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/day4p24iwbg_fill.gif' id='qpfimg4' alt='Day 4 image not available'></div><div id='TABday5G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/day5p24iwbg_fill.gif' id='qpfimg5' alt='Day 5 image not available'></div><div id='TABday6G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/day6p24iwbg_fill.gif' id='qpfimg6' alt='Day 6 image not available'></div><div id='TABday7G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/day7p24iwbg_fill.gif' id='qpfimg7' alt='Day 7 image not available'></div><div id='TABday8G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/d12_fill.gif' id='qpfimg8' alt='Day 8 image not available'></div><div id='TABday9G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/d13_fill.gif' id='qpfimg9' alt='Day 9 image not available'></div><div id='TABday10G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/p120i.gif' id='qpfimg10' alt='Day 10 image not available'></div><div id='TABday11G-qpf' style='display:none;'><img class='display-img-max' src='../qpf/p168i.gif' id='qpfimg11' alt='Day 11 image not available'></div> </div> <div id="forimg-qpf-opt2" style='display:none'> <div id='TABday1G-qpftwl' style='display:block;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f012.gif ' id='qpfimg1' alt='Day 1 image not available'></div><div id='TABday2G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f018.gif ' id='qpfimg2' alt='Day 2 image not available'></div><div id='TABday3G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f024.gif ' id='qpfimg3' alt='Day 3 image not available'></div><div id='TABday4G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f030.gif ' id='qpfimg4' alt='Day 4 image not available'></div><div id='TABday5G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f036.gif ' id='qpfimg5' alt='Day 5 image not available'></div><div id='TABday6G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f042.gif ' id='qpfimg6' alt='Day 6 image not available'></div><div id='TABday7G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f048.gif ' id='qpfimg7' alt='Day 7 image not available'></div><div id='TABday8G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f054.gif ' id='qpfimg8' alt='Day 8 image not available'></div><div id='TABday9G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f060.gif ' id='qpfimg9' alt='Day 9 image not available'></div><div id='TABday10G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f066.gif ' id='qpfimg10' alt='Day 10 image not available'></div><div id='TABday11G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f072.gif ' id='qpfimg11' alt='Day 11 image not available'></div><div id='TABday12G-qpftwl' style='display:none;'><img class='display-img-max' src='../qpf/hpcqpf_2024112718_12hr_f078.gif ' id='qpfimg12' alt='Day 12 image not available'></div> </div> <div id="forimg-qpf-opt3" style='display:none'> <div id='TABday1G-qpfsix' style='display:block;'><img class='display-img-max' src='../qpf/fill_92ewbg.gif' id='qpfimgsix1' alt='Day 1 image not available'></div><div id='TABday2G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_93ewbg.gif' id='qpfimgsix2' alt='Day 2 image not available'></div><div id='TABday3G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9eewbg.gif' id='qpfimgsix3' alt='Day 3 image not available'></div><div id='TABday4G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9fewbg.gif' id='qpfimgsix4' alt='Day 4 image not available'></div><div id='TABday5G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9gewbg.gif' id='qpfimgsix5' alt='Day 5 image not available'></div><div id='TABday6G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9hewbg.gif' id='qpfimgsix6' alt='Day 6 image not available'></div><div id='TABday7G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9iewbg.gif' id='qpfimgsix7' alt='Day 7 image not available'></div><div id='TABday8G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9jewbg.gif' id='qpfimgsix8' alt='Day 8 image not available'></div><div id='TABday9G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9kewbg.gif' id='qpfimgsix9' alt='Day 9 image not available'></div><div id='TABday10G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9lewbg.gif' id='qpfimgsix10' alt='Day 10 image not available'></div><div id='TABday11G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9oewbg.gif' id='qpfimgsix11' alt='Day 11 image not available'></div><div id='TABday12G-qpfsix' style='display:none;'><img class='display-img-max' src='../qpf/fill_9newbg.gif' id='qpfimgsix12' alt='Day 12 image not available'></div> </div> <div id="forimg-qpf-opt4" style='display:none'> <div id='TABday1G-qpf48' style='display:block;'><img class='display-img-max' src='../qpf/95ep48iwbg_fill.gif' id='qpfimg481' alt='Day 1 image not available'></div><div id='TABday2G-qpf48' style='display:none;'><img class='display-img-max' src='../qpf/97ep48iwbg_fill.gif' id='qpfimg482' alt='Day 2 image not available'></div> </div>  <div id='links-qpf' class='links-max'> <a href="/pqpf/conus_hpc_pqpf.php" target="_blank" class="linksmajor"> » View Probabilistic Precipitation Guidance (Day 1-3)</a><br> <a href="/qpf/epm/extreme_precip_monitor.php" target="_blank" class="linksmajor"> » Extreme Precipitation Monitor</a><br>  <a onclick="javascript:displaylinks('dlinks-qpf')" href="javascript:;"> + Additional Links</a> <div id="dlinks-qpf" style="display: none"> <ul class="linkslist"> <li>» <a href="/html/hpcverif.shtml#qpf" alt="Product Verification">Product Verification</a></li> <li>» <a href="/archives/qpf/get_qpf_images.php" alt="Product Archive">Product Archive</a></li> <li>» <a href="/html/fam2.shtml#qpf" alt="Product Info">Product Info</a></li> <li>» Additional formats of QPF: <a href="https://ftp.wpc.ncep.noaa.gov/2p5km_qpf/" alt="GRIB2">GRIB 2</a> | <a href="../html/about_gis.shtml" alt="Shapefiles">Shapefiles</a> | <a href="../kml/kmlproducts.php" alt="KML">KML</a> </li> <li>» <a href="/qpf/qpf2.shtml" alt="Other Products">Other QPF Products</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="ero">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviewe:focus").closest('li').next().find('a.overviewe').focus(); } if (e.keyCode == 37) { $(".overviewe:focus").closest('li').prev().find('a.overviewe').focus(); } } ); $(function() { //$('#firste').focus(); }); </script> <div id='content-ero' class='display-content-max'> <div class='display-text'> <div class="display-title">Excessive Rainfall Forecasts <a href="qpf/excessive_rainfall_outlook_ero.php" alt="Interactive Page" class="legacy-link">Interactive Page</a>:</div> <div id='TABday1S-ero' style='display: block' class='display-validtime'>Valid 16Z Wed Nov 27 2024 - 12Z Thu Nov 28 2024</div><div id='TABday2S-ero' style='display: none' class='display-validtime'>Valid 12Z Thu Nov 28 2024 - 12Z Fri Nov 29 2024</div><div id='TABday3S-ero' style='display: none' class='display-validtime'>Valid 12Z Fri Nov 29 2024 - 12Z Sat Nov 30 2024</div><div id='TABday4S-ero' style='display: none' class='display-validtime'>Valid 12Z Sat Nov 30 2024 - 12Z Sun Dec 1 2024</div><div id='TABday5S-ero' style='display: none' class='display-validtime'>Valid 12Z Sun Dec 1 2024 - 12Z Mon Dec 2 2024</div>    <div class="navbar"> <ul id="minitabs"> <li><a href="#" OnMouseOver="show_tab('ero','TABday1','5')" class="overviewe" onfocus="show_tab('ero','TABday1','5')" id="firste" alt="Day1"><span id="TABday1T-ero" class="active-forecast">Day 1</span></a></li><li><a href="#" OnMouseOver="show_tab('ero','TABday2','5')" class="overviewe" onfocus="show_tab('ero','TABday2','5')" alt="Day2"><span id="TABday2T-ero" class="blank">Day 2</span></a></li><li><a href="#" OnMouseOver="show_tab('ero','TABday3','5')" class="overviewe" onfocus="show_tab('ero','TABday3','5')" alt="Day3"><span id="TABday3T-ero" class="blank">Day 3</span></a></li><li class=testtab><a href="#" OnMouseOver="show_tab('ero','TABday4','5')" class="overviewe" onfocus="show_tab('ero','TABday4','5')" alt="Day4"><span id="TABday4T-ero" class="blank">Day 4</span></a></li><li class=testtab><a href="#" OnMouseOver="show_tab('ero','TABday5','5')" class="overviewe" onfocus="show_tab('ero','TABday5','5')" alt="Day5"><span id="TABday5T-ero" class="blank">Day 5</span></a></li> </ul> </div> </div>    <div> <div id='TABday1G-ero' style='display:block;'><img class='display-img-max' src='../qpf/94ewbg.gif' id='eroimg1' alt='Day 1 image not available'></div><div id='TABday2G-ero' style='display:none;'><img class='display-img-max' src='../qpf/98ewbg.gif' id='eroimg2' alt='Day 2 image not available'></div><div id='TABday3G-ero' style='display:none;'><img class='display-img-max' src='../qpf/99ewbg.gif' id='eroimg3' alt='Day 3 image not available'></div><div id='TABday4G-ero' style='display:none;'><img class='display-img-max' src='../qpf/ero_d45/images/d4wbg.gif' id='eroimg4' alt='Day 4 image not available'></div><div id='TABday5G-ero' style='display:none;'><img class='display-img-max' src='../qpf/ero_d45/images/d5wbg.gif' id='eroimg5' alt='Day 5 image not available'></div> </div>  <div id='links-ero' class='links-max'> <a href="/qpf/excessive_rainfall_outlook_ero.php">Interactive Page</> <br> <a onclick="javascript:displaylinks('dlinks-ero-disco')" href="javascript:;"> + Forecast Discussion</a><br> <div id="dlinks-ero-disco" style="display: none"> <div id='TABday1D-ero' class='dlinks-disco' style='display: block'> <br>Excessive Rainfall Discussion <br>NWS Weather Prediction Center College Park MD <br>1100 AM EST Wed Nov 27 2024 <br>Day 1 <br>Valid 16Z Wed Nov 27 2024 - 12Z Thu Nov 28 2024 <br> <br>The probability of rainfall exceeding flash flood guidance is less <br>than 5 percent. <br> <br>Asherman/Kleebauer <br> <br> <br>Day 1 threat area: <a href="https://www.wpc.ncep.noaa.gov/qpf/94epoints.txt"<u>www.wpc.ncep.noaa.gov/qpf/94epoints.txt</u></a> <br></div><div id='TABday2D-ero' class='dlinks-disco' style='display: none'> <br>Excessive Rainfall Discussion <br>NWS Weather Prediction Center College Park MD <br>1100 AM EST Wed Nov 27 2024 <br>Day 2 <br>Valid 12Z Thu Nov 28 2024 - 12Z Fri Nov 29 2024 <br> <br>The probability of rainfall exceeding flash flood guidance is less <br>than 5 percent. <br> <br>Orrison <br> <br> <br>Day 2 threat area: <a href="https://www.wpc.ncep.noaa.gov/qpf/98epoints.txt"<u>www.wpc.ncep.noaa.gov/qpf/98epoints.txt</u></a> <br></div><div id='TABday3D-ero' class='dlinks-disco' style='display: none'> <br>Excessive Rainfall Discussion <br>NWS Weather Prediction Center College Park MD <br>1100 AM EST Wed Nov 27 2024 <br>Day 3 <br>Valid 12Z Fri Nov 29 2024 - 12Z Sat Nov 30 2024 <br> <br>The probability of rainfall exceeding flash flood guidance is less <br>than 5 percent. <br> <br>Orrison <br> <br>Day 3 threat area: <a href="https://www.wpc.ncep.noaa.gov/qpf/99epoints.txt"<u>www.wpc.ncep.noaa.gov/qpf/99epoints.txt</u></a> <br></div><div id='TABday4D-ero' class='dlinks-disco' style='display: none'>Extended Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>135 PM EST Wed Nov 27 2024 <br> <br> <br>As a pronounced upper trough settles over the central and eastern <br>U.S., a significant Arctic air intrusion in the form of a cold <br>surface high will spread from the northern Plains southeastward <br>into the weekend. This event does not look to break many <br>temperature records nor is it particularly early in the season for <br>the first Arctic airmass. However, the cold will be a noticeable <br>change in many areas, and for some across the northern Plains, <br>potentially dangerous cold temperatures are expected. Overnight <br>lows in the negative teens could combine with wind to bring wind <br>chills down into the -20s, approaching -30F, in North Dakota in <br>particular for the weekend. This will pose an increased risk of <br>hypothermia and frostbite on exposed skin, so take appropriate <br>preparedness actions. Highs are forecast to remain in the single <br>digits and teens. Temperatures are likely to gradually moderate <br>across the north-central U.S. and reach average values by midweek. <br> <br>Meanwhile the cold will spread farther southeast in moderated <br>form, reaching most areas east of the Rockies across the <br>Mississippi Valley, Ohio/Tennessee Valleys, and toward the <br>Appalachians and Eastern Seaboard. A handful of record low max and <br>min temperatures are possible across the Ohio Valley into the <br>Appalachians, where temperatures are forecast to be around 15-20F <br>below average and stay below freezing for highs in many areas. By <br>Tuesday-Wednesday the coldest air will migrate over the East with <br>temperatures generally 10-15 degrees below normal as the upper <br>trough axis slowly shifts east. <br> <br>Heavy lake-effect snow is expected through much of the period, as <br>westerly flow develops snow east of the lakes through Saturday, and <br>winds may shift to a more northwesterly direction into early next <br>week for a snow focus southeast of the lakes Sunday-Tuesday. <br>Significant accumulations are possible for some of the favored lake <br>effect locations. While specific accumulations will become clearer <br>over the next few days, peak amounts are likely downwind of Lake <br>Erie and Lake Ontario. Travel disruptions are likely especially on <br>I-90 between Cleveland and Buffalo and I-81 north of Syracuse. <br> <br>Elsewhere, a quieter period is likely for the West precipitation- <br>wise. Light to locally modest precipitation is possible at times in <br>the Pacific Northwest into the northern Rockies. Expect <br>temperatures in the Rockies westward to be near average late this <br>week and warm to a few degrees above normal into early next week. <br>Models continue to show a general signal for a round of light to <br>moderate snow across parts of the north-central Plains to Mid- <br>Mississippi and Ohio Valleys Saturday, though the axis and timing <br>are somewhat uncertain depending on a shortwave aloft. Return flow <br>of moisture could start to come into the western Gulf Coast region <br>over the weekend for some shower activity, which may spread inland <br>into the south-central U.S. by Monday and Tuesday. <br> <br> <br>Santorelli/Tate <br> <br> <br></div><div id='TABday5D-ero' class='dlinks-disco' style='display: none'>Extended Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>135 PM EST Wed Nov 27 2024 <br> <br> <br>As a pronounced upper trough settles over the central and eastern <br>U.S., a significant Arctic air intrusion in the form of a cold <br>surface high will spread from the northern Plains southeastward <br>into the weekend. This event does not look to break many <br>temperature records nor is it particularly early in the season for <br>the first Arctic airmass. However, the cold will be a noticeable <br>change in many areas, and for some across the northern Plains, <br>potentially dangerous cold temperatures are expected. Overnight <br>lows in the negative teens could combine with wind to bring wind <br>chills down into the -20s, approaching -30F, in North Dakota in <br>particular for the weekend. This will pose an increased risk of <br>hypothermia and frostbite on exposed skin, so take appropriate <br>preparedness actions. Highs are forecast to remain in the single <br>digits and teens. Temperatures are likely to gradually moderate <br>across the north-central U.S. and reach average values by midweek. <br> <br>Meanwhile the cold will spread farther southeast in moderated <br>form, reaching most areas east of the Rockies across the <br>Mississippi Valley, Ohio/Tennessee Valleys, and toward the <br>Appalachians and Eastern Seaboard. A handful of record low max and <br>min temperatures are possible across the Ohio Valley into the <br>Appalachians, where temperatures are forecast to be around 15-20F <br>below average and stay below freezing for highs in many areas. By <br>Tuesday-Wednesday the coldest air will migrate over the East with <br>temperatures generally 10-15 degrees below normal as the upper <br>trough axis slowly shifts east. <br> <br>Heavy lake-effect snow is expected through much of the period, as <br>westerly flow develops snow east of the lakes through Saturday, and <br>winds may shift to a more northwesterly direction into early next <br>week for a snow focus southeast of the lakes Sunday-Tuesday. <br>Significant accumulations are possible for some of the favored lake <br>effect locations. While specific accumulations will become clearer <br>over the next few days, peak amounts are likely downwind of Lake <br>Erie and Lake Ontario. Travel disruptions are likely especially on <br>I-90 between Cleveland and Buffalo and I-81 north of Syracuse. <br> <br>Elsewhere, a quieter period is likely for the West precipitation- <br>wise. Light to locally modest precipitation is possible at times in <br>the Pacific Northwest into the northern Rockies. Expect <br>temperatures in the Rockies westward to be near average late this <br>week and warm to a few degrees above normal into early next week. <br>Models continue to show a general signal for a round of light to <br>moderate snow across parts of the north-central Plains to Mid- <br>Mississippi and Ohio Valleys Saturday, though the axis and timing <br>are somewhat uncertain depending on a shortwave aloft. Return flow <br>of moisture could start to come into the western Gulf Coast region <br>over the weekend for some shower activity, which may spread inland <br>into the south-central U.S. by Monday and Tuesday. <br> <br> <br>Santorelli/Tate <br> <br> <br></div> </div> <a onclick="javascript:displaylinks('dlinks-ero')" href="javascript:;"> + Additional Links</a> <div id="dlinks-ero" style="display: none"> <ul class="linkslist"> <li>» <a href="/html/fam2.shtml#excessrain" alt="Product Info">Product Info</a></li> <li>» <a href="/para/para_images/ERO_Categories.png" alt="Understanding WPC Excessive Rainfall Risk Categories">Understanding WPC Excessive Rainfall Risk Categories</a></li> <li>» <a href="/qpf/eroclimo/" alt="ERO Climatology">Excessive Rainfall Outlook Climatology</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="wwx">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviewwin:focus").closest('li').next().find('a.overviewwin').focus(); } if (e.keyCode == 37) { $(".overviewwin:focus").closest('li').prev().find('a.overviewwin').focus(); } } ); $(function() { $('#firstwin').focus(); }); </script> <div id='content-wwx' class='display-content-max'> <div class='display-text'> <div class="display-title">Winter Weather Forecasts <a href="/wwd/winter_wx.shtml" alt="Legacy Page" class="legacy-link">Legacy Page</a>:</div> <div id='TABday1S-wwx' style='display: block' class='display-validtime'> <snippet>Valid 12Z 11/27/2024 - 12Z 11/28/2024</snippet> </div><div id='TABday2S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 11/28/2024 - 12Z 11/29/2024</snippet> </div><div id='TABday3S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 11/29/2024 - 12Z 11/30/2024</snippet> </div><div id='TABday4S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 11/30/2024 - 12Z 12/01/2024</snippet> </div><div id='TABday5S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 12/01/2024 - 12Z 12/02/2024</snippet> </div><div id='TABday6S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 12/02/2024 - 12Z 12/03/2024</snippet> </div><div id='TABday7S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 12/03/2024 - 12Z 12/04/2024</snippet> </div>    <div class="navbar" id="fordays"> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('wwx','TABday1','7')" class="overviewwin" onfocus="show_tab('wwx','TABday1','7')" id="firstwin" alt="Day1"><span id="TABday1T-wwx" class="active-forecast">Day 1</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('wwx','TABday2','7')" class="overviewwin" onfocus="show_tab('wwx','TABday2','7')" alt="Day2"><span id="TABday2T-wwx" class="blank">Day 2</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('wwx','TABday3','7')" class="overviewwin" onfocus="show_tab('wwx','TABday3','7')" alt="Day3"><span id="TABday3T-wwx" class="blank">Day 3</span></a></li><li class="cforday"><span class='nav-vline'> </span><a href="#" OnMouseOver="show_tab('wwx','TABday4','7')" class="overviewwin" onfocus="show_tab('wwx','TABday4','7')" alt="Day4"><span id="TABday4T-wwx" class="blank">Day 4</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('wwx','TABday5','7')" class="overviewwin" onfocus="show_tab('wwx','TABday5','7')" alt="Day5"><span id="TABday5T-wwx" class="blank">Day 5</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('wwx','TABday6','7')" class="overviewwin" onfocus="show_tab('wwx','TABday6','7')" alt="Day6"><span id="TABday6T-wwx" class="blank">Day 6</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('wwx','TABday7','7')" class="overviewwin" onfocus="show_tab('wwx','TABday7','7')" alt="Day7"><span id="TABday7T-wwx" class="blank">Day 7</span></a></li> <li class="cforday"><a title="more about WPC's Winter Weather Forecasts" href="#" onclick="window.open('../../wwd/wwd_info.html','newwindow', 'width=900, height=500'); return false;"><img class="winwx-question" src="../para/para_css/images/question.png" height="14"></img></a></li>  </ul> </div> </div>  <div id= "options-wrapper" class="options-wrapper"> <div id="options-tab-wwx" class="options-off"> <div class="options-container"> <div class="options-inner1"> <a onclick="javascript:displayoptions('wwx');" href="javascript:;"><img class="options-icon" src="para/para_css/images/options.png" /></a> </div> <div id="opts-wwx" class="options-inner2" style="display: none"> Day 1-3 Image Options: <div class="options-form"> <form> <input id="wwx-for" type="radio" name="format" value="four" onclick="javascript:imgformatwwx('for');" checked ><label for="wwx-for">Snowfall (≥ 4”)</label> <br> <input id="wwx-egt" type="radio" name="format" value="eight" onclick="javascript:imgformatwwx('egt');"><label for="wwx-egt">Snowfall (≥ 8”)</label> <br> <input id="wwx-twl" type="radio" name="format" value="twelve" onclick="javascript:imgformatwwx('twl');"><label for="wwx-twl">Snowfall (≥ 12”)</label> <br> <input id="wwx-ice" type="radio" name="format" value="ice" onclick="javascript:imgformatwwx('ice');"><label for="wwx-ice">Freezing Rain (≥ .25”)</label> <br> <input id="wwx-com" type="radio" name="format" value="composite" onclick="javascript:imgformatwwx('com');"><label for="wwx-com">Composite Charts</label> <br>  </form> </div> <div class='options-form2'><a href="/pwpf/wwd_accum_probs.php" target="_blank">Interactive Map (Day 1-3)</a></div> <div class='options-form3'><a href="/wwd/pwpf_d47/pwpf_medr.php" target="_blank">Interactive Map (Day 4-7)</a></div> <div class='options-form3'><a href="/wwd/wssi/wssi.php" target="_blank">Winter Storm Severity Index</a></div> <div class='options-form3'><a href="/wwd/wssi/prob_wssi.php" target="_blank">Probabilistic Winter Storm<br>Severity Index</a></div> <div class='options-form3'><a href="/wwd/wso" target="_blank">Experimental Winter<br>Storm Outlook</a></div> </div> </div> </div> </div>  <script> function imgformatwwx(nam) { //get new valid times and sources for images var newimgsrc = new Array(); 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} else if (nam =='com') { //display 4-panel composite charts newimgsrc = ["..\/wwd\/day1_composite_conus.gif","..\/wwd\/day2_composite_conus.gif","..\/wwd\/day3_composite_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY4_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY5_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY6_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY7_conus.gif"]; newvaltime = [" <snippet>Valid 12Z 11\/27\/2024 - 12Z 11\/28\/2024<\/snippet>\n"," <snippet>Valid 12Z 11\/28\/2024 - 12Z 11\/29\/2024<\/snippet>\n"," <snippet>Valid 12Z 11\/29\/2024 - 12Z 11\/30\/2024<\/snippet>\n"," <snippet>Valid 12Z 11\/30\/2024 - 12Z 12\/01\/2024<\/snippet>\n"," <snippet>Valid 12Z 12\/01\/2024 - 12Z 12\/02\/2024<\/snippet>\n"," <snippet>Valid 12Z 12\/02\/2024 - 12Z 12\/03\/2024<\/snippet>\n"," <snippet>Valid 12Z 12\/03\/2024 - 12Z 12\/04\/2024<\/snippet>\n"]; } else if (nam =='lcl') { //display low track w/ clusters newimgsrc = ["..\/wwd\/day1_psnow_gt_04_conus.gif","..\/wwd\/day2_psnow_gt_04_conus.gif","..\/wwd\/day3_psnow_gt_04_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY4_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY5_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY6_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY7_conus.gif"]; 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} else { //display default >4" snowfall newimgsrc = ["..\/wwd\/day1_psnow_gt_04_conus.gif","..\/wwd\/day2_psnow_gt_04_conus.gif","..\/wwd\/day3_psnow_gt_04_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY4_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY5_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY6_conus.gif","..\/wwd\/pwpf_d47\/gif\/prbww_sn25_DAY7_conus.gif"]; newvaltime = [" <snippet>Valid 12Z 11\/27\/2024 - 12Z 11\/28\/2024<\/snippet>\n"," <snippet>Valid 12Z 11\/28\/2024 - 12Z 11\/29\/2024<\/snippet>\n"," <snippet>Valid 12Z 11\/29\/2024 - 12Z 11\/30\/2024<\/snippet>\n"," <snippet>Valid 12Z 11\/30\/2024 - 12Z 12\/01\/2024<\/snippet>\n"," <snippet>Valid 12Z 12\/01\/2024 - 12Z 12\/02\/2024<\/snippet>\n"," <snippet>Valid 12Z 12\/02\/2024 - 12Z 12\/03\/2024<\/snippet>\n"," <snippet>Valid 12Z 12\/03\/2024 - 12Z 12\/04\/2024<\/snippet>\n"]; } //change sources in html var numprod = 7; for (i = 0; i < numprod; i++) { var idnum = i + 1; var imgid = 'wwximg' + idnum ; var valtimeid = 'TABday' + idnum + 'S-wwx'; document.getElementById(imgid).src = newimgsrc[i]; document.getElementById(valtimeid).innerHTML = newvaltime[i]; } } </script>  <div> <div id='TABday1G-wwx' style='display:block;'><img class='display-img-max' src='../wwd/day1_psnow_gt_04_conus.gif' id='wwximg1' alt='Day 1 image not available'></div><div id='TABday2G-wwx' style='display:none;'><img class='display-img-max' src='../wwd/day2_psnow_gt_04_conus.gif' id='wwximg2' alt='Day 2 image not available'></div><div id='TABday3G-wwx' style='display:none;'><img class='display-img-max' src='../wwd/day3_psnow_gt_04_conus.gif' id='wwximg3' alt='Day 3 image not available'></div><div id='TABday4G-wwx' style='display:none;'><img class='display-img-max' src='../wwd/pwpf_d47/gif/prbww_sn25_DAY4_conus.gif' id='wwximg4' alt='Day 4 image not available'></div><div id='TABday5G-wwx' style='display:none;'><img class='display-img-max' src='../wwd/pwpf_d47/gif/prbww_sn25_DAY5_conus.gif' id='wwximg5' alt='Day 5 image not available'></div><div id='TABday6G-wwx' style='display:none;'><img class='display-img-max' src='../wwd/pwpf_d47/gif/prbww_sn25_DAY6_conus.gif' id='wwximg6' alt='Day 6 image not available'></div><div id='TABday7G-wwx' style='display:none;'><img class='display-img-max' src='../wwd/pwpf_d47/gif/prbww_sn25_DAY7_conus.gif' id='wwximg7' alt='Day 7 image not available'></div> </div>  <div id='links-wwx' class='links-max'> <a href="/pwpf/wwd_accum_probs.php" target="_blank" class="linksmajor"> » Interactive Winter Weather Map (Day 1-3)</a><br> <a href="/wwd/pwpf_d47/pwpf_medr.php" target="_blank" class="linksmajor"> » Interactive Winter Weather Map (Day 4-7)</a><br> <a href="/wwd/wssi/wssi.php" target="_blank" class="linksmajor"> » Winter Storm Severity Index</a><br> <a href="https://www.wpc.ncep.noaa.gov/Prob_Precip/" target="_blank" class="linksmajor"> » Experimental Probabilistic Precipitation Portal</a><br> <a onclick="javascript:displaylinks('dlinks-wwx-disco')" href="javascript:;"> + Forecast Discussion (Day 1-3)</a><br> <div id="dlinks-wwx-disco" style="display: none"> <div class="dlinks-disco"> Probabilistic Heavy Snow and Icing Discussion <br>NWS Weather Prediction Center College Park MD <br>134 PM EST Wed Nov 27 2024 <br> <br>Valid 00Z Thu Nov 28 2024 - 00Z Sun Dec 01 2024 <br> <br>...Ohio Valley through New England... <br>Days 1-2... <br> <br>Challenging forecast continues for the Thanksgiving holiday as a <br>strengthening low pressure moves from the Ohio Valley to coastal <br>Maine. The system begins to organize beneath a sharpening shortwave <br>tracking across the lower Ohio Valley very late tonight into <br>Thursday morning. This feature will deepen subtly as it moves east, <br>but remain positively tilted as it moves across southern New <br>England (SNE) Thursday afternoon and then into the Canadian <br>Maritimes by Friday morning. Beneath this feature, a surface low <br>will develop in response to the accompanying PVA/height falls, <br>aided by the increasingly diffluent LFQ of a poleward arcing jet <br>streak rotating around the base of the parent trough. This forcing <br>acting upon an elevated baroclinic gradient with attendant WAA <br>downstream of the developing low will help the wave to strengthen, <br>especially the latter half of Thursday as it moves across SNE and <br>into the Gulf of Maine. The guidance, which has been very variable <br>in its solutions, have trended farther north since overnight, and <br>while the ECMWF continues to be the northern/strong outlier, the <br>other models are trending towards a stronger and more northward <br>solution. <br> <br>The track of this low is crucial for both the snowfall footprint <br>and snowfall amounts. The antecedent airmass downstream of the <br>system is marginally supportive for snowfall, with wet-bulb <br>temperatures at or above freezing in many areas outside of terrain. <br>This indicates that outside of the higher elevations, generally <br>above 1500 ft, it will require dynamic cooling to overcome this <br>column and result in accumulating snow. However, this is likely as <br>the guidance still suggests (and the environment conceptually <br>supports) an intensifying quasi-laterally-stationary band of <br>precipitation tracking SW to NW north of the surface low. This will <br>be driven by a narrow but sharply sloped axis of 700-600mb fgen <br>intersecting the deepening DGZ, concurrent with increasing theta-e <br>advection from the E/SE. With a stronger low forecast, this band <br>should be intense, and can support 1-2"/hr snowfall rates despite <br>what should be a heavy wet (low SLR) snowfall. The low SLR, <br>combined with above-freezing wet-bulb temps, snow falling during <br>daylight hours, and the progressive nature of the system should <br>limit significant snowfall in many areas. <br> <br>However, where this band advects, a swath of at least moderate <br>snowfall accumulations are likely, although the narrowness of it <br>will likely limit the probabilistic guidance from capturing its <br>true potential. This results in WPC probabilities that continue to <br>be highest in the higher elevations from the Catskills, through the <br>Adirondacks and Greens, and into the Whites, and much of northern <br>ME, where they are 50-70% for 4+ inches, with storm total snowfall <br>as much as 10" possible in a few of the highest locations. <br>Otherwise, snowfall should be limited to less than 4 inches, but <br>locally higher amounts, even in valley locations, are likely <br>beneath this band, and an inch or two is possible as far southwest <br>as Indiana and Ohio. <br> <br> <br>..Great Lakes... <br>Days 2-3... <br> <br>*** Long duration and widespread heavy Lake Effect Snow event <br> begins Friday *** <br> <br>A closed 500mb low centered near James Bay will spin almost in <br>place into Saturday as a longwave trough amplifies across the <br>eastern CONUS. This low will push height anomalies within the <br>500-700mb layer to below -1 sigma across the eastern CONUS, <br>reflective of the intensity of this early season arctic airmass. As <br>the core of this gyre spins in place, vorticity lobes will <br>periodically shed around it, crossing the Great Lakes, providing <br>surges of CAA and locally enhanced ascent. The result of this will <br>be several days of lake effect snow (LES) in the favored NW snow <br>belts. <br> <br>850mb temps to begin D2 are progged to be generally -5 to -6C in <br>the east, and as cold as -11C across Lake Superior. Through Friday <br>and Saturday, periodic surges in CAA will cool these temps even <br>further, producing impressively steep lapse rates and high <br>inversion levels thanks to lake surface temperatures that are as <br>warm as +8C in Lake Superior and +15C over Lake Erie according to <br>GLERL. This will create lake-induced instability that at times will <br>exceed 1000 J/kg, supporting bands of heavy LES with rates that <br>will likely eclipse 2"/hr at times. While some variation in wind <br>speeds and direction, especially during passes of shortwaves aloft, <br>will cause some wavering in the position of these bands, in <br>general, at least through the end of D3, the heaviest snow should <br>be relatively persistent along the south shore of Lake Superior, <br>near Traverse City, MI, along the Chautauqua Ridge, and towards <br>the Tug Hill Plateau. In these areas, WPC probabilities for more <br>than 6 inches are high (>70%) both Friday and Saturday, with 2-4 <br>feet of snow possible in the most long-lasting and intense bands <br>through the end of the forecast period. <br> <br>The arctic-sourced cold and subsequent LES off the Great Lakes <br>through the weekend is the subject of the Key Messages which are <br>linked below. <br> <br> <br>...Central Plains to Mid-Mississippi Valley... <br>Day 3... <br> <br>A fast moving clipper type low will skirt around the periphery of a <br>longwave trough embedded across the eastern CONUS, bringing a <br>stripe of snow from Nebraska through the Bootheel of Missouri. This <br>clipper will be driven buy a sharp shortwave digging southeast <br>while amplifying, working in tandem with the LFQ of a modest jet <br>streak following in its wake, and moving along a baroclinic <br>gradient left in place by a cold front. Weak WAA downstream of this <br>low will produce a period of 280-285K isentropic ascent Friday <br>night through Saturday, coincident with a deepening of the DGZ to <br>support a swath of heavy snow. The timing of the heaviest snow is <br>likely to be very early Saturday morning through the afternoon <br>which could additionally limit accumulation potential (already <br>somewhat muted due to progressive nature of generally weak ascent), <br>but WPC probabilities for 1+ inches are 30-50%, with locally 3+" <br>possible. Although this snowfall is minor, it will occur after a <br>period of cold air so it should efficiently accumulate and could <br>produce hazardous travel conditions. <br> <br> <br>The probability of significant ice across the CONUS is less than <br>10 percent. <br> <br> <br>Weiss <br> <br> <br> <br>...Winter Storm Key Messages are in effect. Please see current <br> Key Messages below... <br> <br><a href="https://www.wpc.ncep.noaa.gov/key_messages/LatestKeyMessage_1.png"><u><a href="https://www.wpc.ncep.noaa.gov/key_messages/LatestKeyMessage_1.png" target="_blank">https://www.wpc.ncep.noaa.gov/key_messages/LatestKeyMessage_1.png</a></u></a> <br> </div> </div> <a onclick="javascript:displaylinks('dlinks-wwx')" href="javascript:;"> + Additional Links</a> <div id="dlinks-wwx" style="display: none"> <ul class="linkslist"> <li>» <a href="/wwd/wso" target="_blank">Experimental Winter Storm Outlook</a></li> <li>» <a href="/wwd/wssi/prob_wssi.php" target="_blank">Probabilistic Winter Storm Severity Index</a></li> <li>» <a href="../verification/winwx/winwx.php" alt="Product Verification">Product Verification</a></li> <li>» <a href="../archives/web_pages/winwx/get_winwx_images.php" alt="Product Archive">Product Archive</a></li> <li>» <a href="../wwd/about.shtml" alt="Product Info">Product Info</a></li> <li>» Forecast Surface Low Positions: <a href="../wwd/lowtrack_circles.gif" alt="Low Track Circles">Uncertainty Circles</a> | <a href="../lowtracks/lowtrack_ensembles.gif" alt="Low Track Ensembles">Ensemble Clusters</a> </li> <li>» <a href="../wwd/winter_wx.shtml" alt="Other Products">Other Winter Weather Products</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="med">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviewm:focus").closest('li').next().find('a.overviewm').focus(); 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This pattern with <br>west/northwest winds will become favorable for long duration lake <br>effect snow. Some of the snowfall accumulations could be <br>significant in favored locations. The trough aloft and cold surface <br>high pressure stemming from the Arctic will cause temperatures to <br>drop well below average across much of the country east of the <br>Rockies. This will be the coldest air of the season so far, with <br>temperatures falling into the negative teens and wind chills in the <br>-20s in North Dakota Saturday morning. Meanwhile benign weatherand <br> more moderate temperatures are forecast for the West. <br> <br> <br>...Guidance/Predictability Assessment... <br> <br>The guidance continues to show good agreement on the large scale <br>pattern across the CONUS into next week. Some smaller scale <br>features embedded within the mean flow could have impacts on <br>sensible weather, but are also much less predictable at later time <br>scales. This includes multiple shortwaves tracking through the <br>western and southern sides of the trough that could provide forcing <br>for light snow events, lake effect snow enhancement, or just help <br>determine where the frontal position will be. By Tuesday-Wednesday <br>the models differ with the strength of a shortwave exiting into the <br>western Atlantic and also with how much energy comes south from <br>central Canada. Elsewhere, split flow will prevail across the <br>eastern Pacific to western U.S., as northern stream ridging comes <br>across the Pacific Northwest, while a couple rounds of southern <br>stream troughing nudges toward California. Across the entire CONUS <br>though, a general model blend seems to suffice to help smooth some <br>of the less predictable details. Was able to blend the operational <br>guidance the first half of the period, bringing in up to half <br>ensemble means by day 7. Overall, maintained very good agreement <br>with the previous WPC forecast. <br> <br> <br>...Weather/Hazards Highlights... <br> <br>As a pronounced upper trough settles over the central and eastern <br>U.S., a significant Arctic air intrusion in the form of a cold <br>surface high will spread from the northern Plains southeastward <br>into the weekend. This event does not look to break many <br>temperature records nor is it particularly early in the season for <br>the first Arctic airmass. However, the cold will be a noticeable <br>change in many areas, and for some across the northern Plains, <br>potentially dangerous cold temperatures are expected. Overnight <br>lows in the negative teens could combine with wind to bring wind <br>chills down into the -20s, approaching -30F, in North Dakota in <br>particular for the weekend. This will pose an increased risk of <br>hypothermia and frostbite on exposed skin, so take appropriate <br>preparedness actions. Highs are forecast to remain in the single <br>digits and teens. Temperatures are likely to gradually moderate <br>across the north-central U.S. and reach average values by midweek. <br> <br>Meanwhile the cold will spread farther southeast in moderated <br>form, reaching most areas east of the Rockies across the <br>Mississippi Valley, Ohio/Tennessee Valleys, and toward the <br>Appalachians and Eastern Seaboard. A handful of record low max and <br>min temperatures are possible across the Ohio Valley into the <br>Appalachians, where temperatures are forecast to be around 15-20F <br>below average and stay below freezing for highs in many areas. By <br>Tuesday-Wednesday the coldest air will migrate over the East with <br>temperatures generally 10-15 degrees below normal as the upper <br>trough axis slowly shifts east. <br> <br>Heavy lake-effect snow is expected through much of the period, as <br>westerly flow develops snow east of the lakes through Saturday, and <br>winds may shift to a more northwesterly direction into early next <br>week for a snow focus southeast of the lakes Sunday-Tuesday. <br>Significant accumulations are possible for some of the favored lake <br>effect locations. While specific accumulations will become clearer <br>over the next few days, peak amounts are likely downwind of Lake <br>Erie and Lake Ontario. Travel disruptions are likely especially on <br>I-90 between Cleveland and Buffalo and I-81 north of Syracuse. <br> <br>Elsewhere, a quieter period is likely for the West precipitation- <br>wise. Light to locally modest precipitation is possible at times in <br>the Pacific Northwest into the northern Rockies. Expect <br>temperatures in the Rockies westward to be near average late this <br>week and warm to a few degrees above normal into early next week. <br>Models continue to show a general signal for a round of light to <br>moderate snow across parts of the north-central Plains to Mid- <br>Mississippi and Ohio Valleys Saturday, though the axis and timing <br>are somewhat uncertain depending on a shortwave aloft. Return flow <br>of moisture could start to come into the western Gulf Coast region <br>over the weekend for some shower activity, which may spread inland <br>into the south-central U.S. by Monday and Tuesday. <br> <br> <br>Santorelli/Tate <br> <br> <br>Additional 3-7 Day Hazard information can be found on the WPC <br>medium <br>range hazards outlook chart at: <br><a href="https://www.wpc.ncep.noaa.gov/threats/threats.php"><u><a href="https://www.wpc.ncep.noaa.gov/threats/threats.php" target="_blank">https://www.wpc.ncep.noaa.gov/threats/threats.php</a></u></a> <br> <br>WPC medium range 500mb heights, surface systems, weather grids, <br>quantitative precipitation forecast (QPF), excessive rainfall <br>outlook (ERO), winter weather outlook (WWO) probabilities, heat <br>indices, and Key Messages can be accessed from: <br> <br><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif"><u><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif" target="_blank">https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif"><u><a href="https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif" target="_blank">https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html"><u><a href="https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html" target="_blank">https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml"><u><a href="https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml" target="_blank">https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/#page=ero"><u><a href="https://www.wpc.ncep.noaa.gov/#page=ero" target="_blank">https://www.wpc.ncep.noaa.gov/#page=ero</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4"><u><a href="https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4" target="_blank">https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/heat_index.shtml"><u><a href="https://www.wpc.ncep.noaa.gov/heat_index.shtml" target="_blank">https://www.wpc.ncep.noaa.gov/heat_index.shtml</a></u></a> <br><a href="https://www.wpc.ncep.noaa.gov/#page=ovw"><u><a href="https://www.wpc.ncep.noaa.gov/#page=ovw" target="_blank">https://www.wpc.ncep.noaa.gov/#page=ovw</a></u></a> <br> </div> </div> <a onclick="javascript:displaylinks('dlinks-med')" href="javascript:;"> + Additional Links</a> <div id="dlinks-med" style="display: none"> <ul class="linkslist"> <li>» <a href="/archives/web_pages/medr/get_medr_products.php" alt="Product Archive">Product Archive</a></li> <li>» <a href="/medr/about_medr.shtml" alt="Product Info">Product Info</a></li> <li>» <a href="/medr/5dayfcst_wbg_conus.gif" alt="Product Info">Day 3-7 Surface Composite</a></li> <li>» <a href="/medr/medr.shtml" alt="Other Products">Other Medium Range Products</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="tls">  <div id='content-tls' class='display-content-max'> <div class='display-text'> <div class="display-title">Forecaster's Toolbox (Prototype)</div>   <div class="collab-block2"> <div class="collab-block2-title">Tools Generated at WPC</div> <div class="collab-tools-disclaim"> These tools are NOT operationally supported. Data may not update regularly due to workstation failure and/or data unavailability. </div> <div id="tools" class="collab-tools-content"> <a href="https://www.wpc.ncep.noaa.gov/rainfallreports" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">Intense Rainfall and Flash Flood Reports</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/Experimental_intense_rainfall.PNG' alt='Prototype Weather in Context' /> </div> <div class="collab-tools-des"> <p>Displays flood and flash flood reports as well as intense rainfall observations for user-selectable time ranges and customizable geographic regions. Includes ability to download reports and associated metadata in csv format. </div> </div> </a> <a href="./exper/gefs/gefs.html" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">GEFS Probabilities</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_includes/collaboration/gefsprobs.png' alt='GEFS Probs' /> </div> <div class="collab-tools-des"> <p>Plots of GEFS probabilistic forecast of precipitation, temperature, and sea-level pressure exceeding various thresholds.</p> </div> </div> </a> </div> <div id="tools" class="collab-tools-content"> <a href="./exper/lsr/lsr.php" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">Local Storm Reports</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/lsr.png' alt='Local Storm Reports' /> </div> <div class="collab-tools-des"> <p>Custom plots of Local Storm Reports across the Contiguous United States. Reports include rain, snow, ice, and severe weather, as well as other significant information from storm spotters.</p> </div> </div> </a> <a href="/qpf/epm/extreme_precip_monitor.php" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">Extreme Precipitation Monitor</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='/para/para_images/epm_exper_staticimage.png' alt='Extreme Precipitation Monitor' /> </div> <div class="collab-tools-des"> <p>Displays the climatological significance of precipitation forecast by WPC. The climatological significance is represented by Average Recurrence Intervals (ARIs) of precipitation estimates from NOAA Atlas-14 and Atlas2.</p> </div> </div> </a> </div> <div id="tools" class="collab-tools-content"> <a href="http://satable.ncep.noaa.gov/" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">Ensemble Situational Awareness Table</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/esat.png' alt='ESAT' /> </div> <div class="collab-tools-des"> <p>An interactive situational awareness table that displays anomalies, percentiles, and return intervals from the GEFS, NAEFS, and ECMWF Ensembles (login required to view ECMWF data). <p>*Please note that there is currently an issue where only users on a NOAA network can access this page. We are actively working to resolve this problem. </p> </div> </div> </a> <a href="/exper/ndfd/ndfd.html" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">NDFD Forecast Temperature Records</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/ndfdrecords_example.png' alt='NDFD Records' /> </div> <div class="collab-tools-des"> <p>Interactive display of where temperatures could approach or exceed records within the contiguous U.S. (based on NDFD temperature forecasts)                                                                                                                                                                                                                                     </p> </div> </div> </a> </div> <div id="tools" class="collab-tools-content"> <a href="/exper/ndfdmxmn/map.html" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">NWS NDFD Max/Min Temperatures and Departure from Normal</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/ndfd_maxmin_departure.gif' alt='NWS NDFD Max/Min Temperatures and Departure from Normal' /> </div> <div class="collab-tools-des"> <p>Displays Days 1-7 NDFD maximum and minimum temperatures, along with their respective departures from climatology. </div> </div> </a> <a href="/snowbands/view.php" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">Prototype Snowband Probability Forecasts</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/MTD_example.png' alt='Prototype Snowband Probability Forecasts' /> </div> <div class="collab-tools-des"> <p>An interactive tool that depicts areas of heavy snowfall from individual members of high-resolution short range ensemble forecasts. </div> </div> </a> </div> <div id="tools" class="collab-tools-content"> <a href="/hmt/weather_in_context/prototype/index.php" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">Weather in Context Prototype</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/wxincontext_staticimage.PNG' alt='Prototype Weather in Context' /> </div> <div class="collab-tools-des"> <p>Displays forecast information and its climatological context to quickly alert a forecaster when a record or neear-record breaking event is possible. This tool is available for both CONUS and Alaska. </div> </div> </a>  </a> </div> <div id="tools" class="collab-tools-content"> <a href="./exper/change/change.html" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">1/3/6/24-hr Changes</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./exper/change/tmpf_latest_24_us.gif' alt='1/3/4/24-hr Changes' /> </div> <div class="collab-tools-des"> <p>Change in weather parameters (temperature, dewpoint, surface pressure, etc) over the last 1/3/6/24 hours. Data is provided from the Real-Time Mesoscale Analysis (RTMA) or the Rapid Refresh (RAP).</p> </div> </div> </a> <a href="https://www.wpc.ncep.noaa.gov/heatrisk" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">Experimental HeatRisk</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/images/HeatRisk_example.png' alt='HeatRisk Map' /> </div> <div class="collab-tools-des"> <p>The experimental National Weather Service (NWS) HeatRisk is a color-numeric-based index that provides a forecast of the potential level of risk for heat-related impacts to occur over a 24-hour period, with forecasts available out through 7 days. </div> </div> </a> </div>  </div>  <div class="collab-block2"> <div class="collab-block2-title">Other Favorite Forecast Tools</div> <div id="tools" class="collab-tools-content"> <a href="http://www.eas.slu.edu/CIPS/ANALOG/analog.php" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">CIPS Guidance</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_includes/collaboration/cips.png' alt='CIPS Guidance' /> </div> <div class="collab-tools-des"> <p>Analog guidance that uses an objective approach to find historical events that are similar to the upcoming forecast.</p> </div> </div> </a> <a href="https://vlab.noaa.gov/web/mdl/nbm" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">National Blend of Models</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_includes/collaboration/nblend.png' alt='National Blend' /> </div> <div class="collab-tools-des"> <p>Nationally consistent and skillful suite of calibrated forecast guidance based on a blend of both NWS and non-NWS numerical weather prediction model data and post-processed model guidance.</p> </div> </div> </a> </div> <div id="tools" class="collab-tools-content"> <a href="https://cw3e.ucsd.edu/iwv-and-ivt-forecasts/" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">Atmospheric River Portal</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_includes/collaboration/cw3e_arportal.png' alt='AR Portal' /> </div> <div class="collab-tools-des"> <p>A portal for atmospheric river forecasts and diagnostics from the Center for Western Weather and Water Extremes.</p> </div> </div> </a> <a href="http://www.emc.ncep.noaa.gov/users/meg/gefs_plumes/" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">GEFS Plumes</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_includes/collaboration/gefs.png' alt='GEFS Plumes' /> </div> <div class="collab-tools-des"> <p>An interactive display of time series plots from GEFS ensemble members at a point.</p> </div> </div> </a> </div> <div id="tools" class="collab-tools-content"> <a href="https://www.spc.noaa.gov/exper/" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">SPC Forecast Tools</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_images/spctools.png' alt='SPC Tools' /> </div> <div class="collab-tools-des"> <p>A variety of useful tools generated at The Storm Prediction Center (SPC).</p> </div> </div> </a> <a href="https://ecmwf.int/en/forecasts/charts" target="_blank"> <div class="collab-tools-border"> <div class="collab-tools-title">ECMWF Forecast Charts</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='./para/para_includes/collaboration/ecmwf.png' alt='ECMWF' /> </div> <div class="collab-tools-des"> <p>Output from the ECMWF Integrated Forecasting System (IFS), including medium range deterministic, ensemble, and machine learning model forecasts.</p> </div> </div> </a> </div> </div> </div> </div> </div> </div> </div> </div> <script 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