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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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<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'>Apr 09</th><th id='hz-daytwo'>Apr 10</th><th id='hz-daythree'>Apr 11</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 is a Marginal Risk of Excessive Rainfall on Day 3' class='marginal'><a href='/qpf/ero.php?opt=curr&day=3' target='_blank'>Marginal</a></td> </tr> <tr><td headers='hz-hazards'>Heavy Snow (≥ 4”)</td><td headers='hz-dayone' title='There is a Slight Risk of Snow Accumulations ≥ 4” on Day 1' class='slight'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=1&ftype=probabilities' target='_blank'>Slight</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 Moderate Risk of Snow Accumulations ≥ 4” on Day 3' class='moderate'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=3&ftype=probabilities' target='_blank'>Moderate</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 Apr 9, 2025</div><div id='TABday2S-ovw' style='display: none' class='display-validtime'><br>Valid Thu Apr 10, 2025</div><div id='TABday3S-ovw' style='display: none' class='display-validtime'><br>Valid Fri Apr 11, 2025</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='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='headline0' /><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='headline1' /><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='headline2' /><br>View the Winter Storm Severity Index to see potential impacts from winter weather</div></a><a href='/kml/kmlproducts.php' target='_blank'><div class='news-list-border'><img id='highlightimg' class='news-logo-img-yes' src='/para/para_images/GIS_products.png' alt='headline3' /><br>Looking for data from WPC products in a GIS format?</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 09Z Tue Apr 08, 2025</div><div id='TABday2S-sfc' style='display: none' class='display-validtime'>Analyzed at 12Z 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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 = ["09","12","15","18","21","00","03","06","09"]; var oldimgsrc = ["\/archives\/sfc\/2025\/namussfc2025040809.gif","\/sfc\/namussfc12wbg.gif","\/sfc\/namussfc15wbg.gif","\/sfc\/namussfc18wbg.gif","\/sfc\/namussfc21wbg.gif","\/sfc\/namussfc00wbg.gif","\/sfc\/namussfc03wbg.gif","\/sfc\/namussfc06wbg.gif","\/sfc\/namussfc09wbg.gif"]; //info to grab from archives var ayear = "2025"; var afilename = "2025040809"; //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/2025/namussfc2025040809.gif' id='sfcimg1' alt='Day 1 image not available'></div><div id='TABday2G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc12wbg.gif' id='sfcimg2' alt='Day 2 image not available'></div><div id='TABday3G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc15wbg.gif' id='sfcimg3' alt='Day 3 image not available'></div><div id='TABday4G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc18wbg.gif' id='sfcimg4' alt='Day 4 image not available'></div><div id='TABday5G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc21wbg.gif' id='sfcimg5' alt='Day 5 image not available'></div><div id='TABday6G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc00wbg.gif' 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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 09Z Wed Apr 09, 2025</div><div id='TABday2S-frt' style='display: none' class='display-validtime'>Valid 18Z Wed Apr 09, 2025</div><div id='TABday3S-frt' style='display: none' class='display-validtime'>Valid 00Z Thu Apr 10, 2025</div><div id='TABday4S-frt' style='display: none' class='display-validtime'>Valid 06Z Thu Apr 10, 2025</div><div id='TABday5S-frt' style='display: none' class='display-validtime'>Valid 12Z Thu Apr 10, 2025</div><div id='TABday6S-frt' style='display: none' class='display-validtime'>Valid 00Z Fri Apr 11, 2025</div><div id='TABday7S-frt' style='display: none' class='display-validtime'>Valid 12Z Fri Apr 11, 2025</div><div id='TABday8S-frt' style='display: none' class='display-validtime'>Valid 12Z Sat Apr 12, 2025</div><div id='TABday9S-frt' style='display: none' class='display-validtime'>Valid 12Z Sun Apr 13, 2025</div><div id='TABday10S-frt' style='display: none' class='display-validtime'>Valid 12Z Mon Apr 14, 2025</div><div id='TABday11S-frt' style='display: none' class='display-validtime'>Valid 12Z Tue Apr 15, 2025</div><div id='TABday12S-frt' style='display: none' class='display-validtime'>Valid 12Z Wed Apr 16, 2025</div>    <div class="navbar" id="fordays"> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday1','12')" class="overviewf" onfocus="show_tab('frt','TABday1','12')" id="firstf" alt="Day1"><span id="TABday1T-frt" class="active-forecast">09ZWed</span></a></li><li class="cforday"><span class='nav-vline'> </span><a href="#" OnMouseOver="show_tab('frt','TABday2','12')" class="overviewf" onfocus="show_tab('frt','TABday2','12')" alt="Day2"><span id="TABday2T-frt" class="blank">18ZWed</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday3','12')" class="overviewf" onfocus="show_tab('frt','TABday3','12')" alt="Day3"><span id="TABday3T-frt" class="blank">00ZThu</span></a></li><li class="cforday"><a href="#" 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class="blank">12ZSat</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday9','12')" class="overviewf" onfocus="show_tab('frt','TABday9','12')" alt="Day9"><span id="TABday9T-frt" class="blank">12ZSun</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday10','12')" class="overviewf" onfocus="show_tab('frt','TABday10','12')" alt="Day10"><span id="TABday10T-frt" class="blank">12ZMon</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday11','12')" class="overviewf" onfocus="show_tab('frt','TABday11','12')" alt="Day11"><span id="TABday11T-frt" class="blank">12ZTue</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday12','12')" class="overviewf" onfocus="show_tab('frt','TABday12','12')" alt="Day12"><span id="TABday12T-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/usfntsfc09wbg.gif' id='frtimg1' alt='Day 1 image not available'></div><div id='TABday2G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/93fndfd_init_2025040900.gif ' id='frtimg2' alt='Day 2 image not available'></div><div id='TABday3G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/94fndfd_init_2025040900.gif ' id='frtimg3' alt='Day 3 image not available'></div><div id='TABday4G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/95fndfd_init_2025040900.gif ' id='frtimg4' alt='Day 4 image not available'></div><div id='TABday5G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/96fndfd_init_2025040900.gif ' id='frtimg5' alt='Day 5 image not available'></div><div id='TABday6G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/98fndfd_init_2025040900.gif ' id='frtimg6' alt='Day 6 image not available'></div><div id='TABday7G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/99fndfd_init_2025040900.gif ' id='frtimg7' alt='Day 7 image not available'></div><div id='TABday8G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf072.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+frontsf096.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+frontsf120.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+frontsf144.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+frontsf168.gif' id='frtimg12' alt='Day 12 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>410 AM EDT Wed Apr 09 2025 <br> <br>Valid 12Z Wed Apr 09 2025 - 12Z Fri Apr 11 2025 <br> <br> <br>...Below normal temperatures continue across the East while well above <br>normal and near-record warmth builds across the West... <br> <br>...Severe weather expected across portions of the Mid/Deep South and <br>Tennessee Valley on Thursday... <br> <br>...Pair of low pressure systems to bring increasingly unsettled weather to <br>much of the East Thursday into Friday... <br> <br> <br>In the wake of a strong cold front, temperatures across much of the <br>Eastern U.S. will continue to run 10 to 20 degrees below normal on <br>Wednesday. After a very chilly start with lows nearing, at, or below <br>freezing for many, high temperatures will range from the 20s and 30s <br>across the northern interior sections of the Northeast, to the 30s, 40s, <br>and 50s, from the Upper Midwest to the Mid-Atlantic. Farther south, highs <br>will top out in the 50s, 60s, and 70s from the Ohio Valley and southern <br>Mid-Atlantic to the Southeast and Gulf Coast. Despite some likely <br>moderation, temperatures for most of the East will remain below normal <br>into the weekend thanks to a large and deepening upper level trough and a <br>pair of low pressure systems. In stark contrast, a large upper level ridge <br>will build over the Western U.S. the next few days, resulting in mainly <br>dry weather and well above normal temperatures. In fact, high temperature <br>anomalies across the West will climb to between 10 and 30 degrees above <br>seasonal norms through Friday, translating to highs in the 50s and 60s <br>across the far north/Pacific Northwest, to the 70s and 80s outside of the <br>mountains farther south, to the 90s and 100s across portions of the Desert <br>Southwest and southern Plains. High temperatures may even approach or <br>possibly break records for many places Thursday, Friday and into the <br>weekend. <br> <br>As alluded to above, a highly amplified pattern will begin to take shape <br>the next few days, with a large ridge building over the West and a <br>deepening trough over the East. While the ridge will keep most of the West <br>outside of the Pacific Northwest mainly dry through Friday, the trough <br>will bring increasingly unsettled and stormy weather to the East. This <br>period of wetter weather starts with a generally weak low pressure system <br>that will track from the Upper Midwest, to the Ohio Valley, to the Great <br>Lakes and Northeast through Thursday. This will bring light rain and snow <br>showers to the region, with snow mainly confined to the Upper Midwest, <br>Great Lakes, and interior Northeast. A second, stronger low pressure <br>system will develop across the Ohio and Tennessee Valleys on Thursday <br>before tracking into the Mid-Atlantic and Northeast Friday into Saturday. <br>Ahead of the developing low, increasing moisture and instability will set <br>the stage for a severe weather threat across portions of the Mid/Deep <br>South and the Tennessee Valley on Thursday. As a result, the Storm <br>Prediction Center has issued a Slight Risk (level 2/5) for potential <br>severe thunderstorms that are capable of producing large hail and damaging <br>winds. The severe weather threat then transitions to a concern for <br>moderate to locally heavy rain across portions of the Mid-Atlantic and <br>Northeast on Friday, with the Weather Prediction Center issuing a Marginal <br>Risk (level 1/4) of excessive rainfall. While parts of the Mid-Atlantic <br>and Northeast could certainly use the rain, isolated to scattered <br>instances of flooding, particularly in urban, low-lying, or poor drainage <br>areas, cannot be ruled out. <br> <br> <br>Miller <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>248 AM EDT Wed Apr 9 2025 <br> <br>Valid 12Z Sat Apr 12 2025 - 12Z Wed Apr 16 2025 <br> <br> <br>...General Overview... <br> <br>An amplified upper level trough will be in place across the East <br>Coast for the upcoming weekend, with a surface low off the Mid- <br>Atlantic coast that will track in the general direction of Nova <br>Scotia by early next weekend. Meanwhile, an upper ridge will be in <br>place across the Plains that will support warm conditions for this <br>time of year. An incoming upper trough across the northern Rockies <br>will then spur surface cyclogenesis across the central/northern <br>Plains by Sunday with a cold front crossing the Intermountain West. <br>The cold front should then reach the south-central U.S. by Tuesday <br>morning with the upper ridge breaking down. Another trough is <br>likely to reach the West Coast region during the Tuesday to <br>Wednesday time period, but uncertainty is higher on its evolution. <br> <br>...Guidance/Predictability Assessment... <br> <br>The 00Z model guidance suite has come into better agreement with <br>the trough axis crossing the northwestern states over the weekend. <br>The 12Z CMC was a slow outlier and not used beyond day 4 given its <br>timing differences, but the new 00Z run is in much better <br>agreement. This also holds true for the potential closed upper low <br>near the Desert Southwest late in the forecast period, but still <br>remains more uncertain than other parts of the country. For the <br>system across the East Coast this weekend, the GFS it a bit <br>farther northwest with the surface low across the northern Mid- <br>Atlantic, and the CMC more offshore, but otherwise good agreement <br>noted for this region. <br> <br>The WPC fronts and pressures forecast was derived mainly from a <br>GFS/ECMWF/UKMET/previous WPC blend for this weekend, and then <br>mainly GFS/ECMWF and their respective ensemble means going forward <br>into the first half of next week, with means up to about 60% by <br>Wednesday. <br> <br>...Weather/Hazards Highlights... <br> <br>The low pressure system emerging off the southern New England coast <br>this weekend will likely keep widespread light to moderate rainfall <br>across the Northeast U.S., especially on Saturday with the <br>heaviest rainfall beginning to exit the Cape Cod region. Higher <br>elevation snow is likely for the northern Appalachians through the <br>weekend with several inches of accumulation possible. With most of <br>the heaviest rainfall expected on Friday, it appears unlikely that <br>there will be any excessive rainfall concerns going into <br>Saturday/Day 4, so no risk areas are warranted. An even less <br>eventful rainfall forecast is expected for Sunday/Day 5, and <br>therefore no risk areas are necessary as well, even though there <br>will likely be a swath of moderate rainfall across the northern <br>tier states with the surface low moving through. <br> <br>Elsewhere across the Continental U.S., several inches of snowfall <br>is likely across the higher terrain of the Northern Rockies through <br>the weekend as the upper low moves across the region. The front <br>moving across the central Plains and Midwest will not have much <br>moisture or instability to work with, so rainfall associated with <br>it should be mainly light. There may be an increase in shower <br>coverage across portions of the southern Plains by the middle of <br>next week as a potential wave of low pressure develops along the <br>front, but does not look impressive at this time. <br> <br>The mid-upper level ridge axis exiting the Rockies and across the <br>Plains through the upcoming weekend will support widespread above <br>normal temperatures from the Desert Southwest to the central and <br>northern Plains. Highs could reach into the 90s from western Texas <br>to eastern Colorado and western Kansas, before the cold front <br>brings readings closer to climatology for Monday. The warmth then <br>encompasses the Midwest to the Deep South to start the week and <br>then it reaches the East Coast by Tuesday, with highs about 5-15 <br>degrees above average. However, widespread cloud cover over the <br>weekend will tend to keep things cooler than mid-April standards <br>across the Eastern U.S. before things moderate next week. <br> <br>Hamrick <br> <br> <br>Additional 3-7 Day Hazard information can be found on the WPC <br>medium 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>315 AM EDT Wed Apr 9 2025 <br> <br>Valid 00Z Thu 10 Apr 2025 - 00Z Thu 17 Apr 2025 <br> <br>A strong surface high will be centered north of Hawaii through the <br>middle to end of the week near 35 degrees north, with breezy to <br>windy easterly trade wind flow. The models agree that a col will <br>likely develop within the subtropical ridge axis over the weekend, <br>with a frontal boundary approaching the far northwestern islands. <br>The high then rebuilds north of the state by next Monday before <br>moving northeast by Tuesday, with good overall model agreement. <br> <br>The typical trade wind enhanced showers can be expected most days, <br>with perhaps some heavier showers across the northwestern Islands <br>for the end of this week with a brief increase in precipitable <br>water values. There are no major rainfall events on the horizon <br>over the next week. <br> <br>Hamrick <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> $(document).keydown( function(e) { if (e.keyCode == 39) { //$(".overviewqpf:focus").closest('li').next().find('a.overviewqpf').focus(); $(".overviewqpf:focus").closest('li').next().find('a.overviewqpf').focus(); } if (e.keyCode == 37) { 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$(".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 12Z Wed Apr 09 2025 - 12Z Thu Apr 10 2025</div><div id='TABday2S-ero' style='display: none' class='display-validtime'>Valid 12Z Thu Apr 10 2025 - 12Z Fri Apr 11 2025</div><div id='TABday3S-ero' style='display: none' class='display-validtime'>Valid 12Z Fri Apr 11 2025 - 12Z Sat Apr 12 2025</div><div id='TABday4S-ero' style='display: none' class='display-validtime'>Valid 12Z Sat Apr 12 2025 - 12Z Sun Apr 13 2025</div><div id='TABday5S-ero' style='display: none' class='display-validtime'>Valid 12Z Sun Apr 13 2025 - 12Z Mon Apr 14 2025</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>348 AM EDT Wed Apr 9 2025 <br>Day 1 <br>Valid 12Z Wed Apr 09 2025 - 12Z Thu Apr 10 2025 <br> <br>At the moment...heavy rain potential near the Florida coast <br>appears to be mostly offshore, except perhaps Cape Canaveral where <br>there is a non-zero chance of heavy rainfall within convective <br>banding due to onshore flow advecting in instability from the <br>nearby Atlantic. However, precipitable water values appear low for <br>atmospheric saturation, even taking into account the cooler air <br>mass in place. Overall, any heavy rain related issues would be <br>isolated at best and the probability of rainfall exceeding flash <br>flood guidance is considered to be less than 5 percent. <br> <br>Roth <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>348 AM EDT Wed Apr 9 2025 <br>Day 2 <br>Valid 12Z Thu Apr 10 2025 - 12Z Fri Apr 11 2025 <br> <br>A broad area of instability is forecast to develop across the <br>Lower Ohio Valley and portions of the Mid-South which shifts into <br>the Southern Appalachians with time. Moisture availability appears <br>sufficient for atmospheric saturation within a cool atmosphere <br>under a digging upper level trough. However, the area of sufficient <br>moisture/moisture plume appears to be on the move. This should <br>limit the overall excessive rainfall/flash flood potential. The <br>probability of rainfall exceeding flash flood guidance may be non- <br>zero, but it is considered to be less than 5 percent. <br> <br>Roth <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>348 AM EDT Wed Apr 9 2025 <br>Day 3 <br>Valid 12Z Fri Apr 11 2025 - 12Z Sat Apr 12 2025 <br> <br>...A MARGINAL RISK OF EXCESSIVE RAINFALL EXISTS FOR PORTIONS OF THE <br>MID-ATLANTIC STATES AND SOUTHERN NEW ENGLAND... <br> <br>A deep layer cyclone slows down as it moves across the Mid-Atlantic <br>States on Friday. The 1000-500 hPa thickness values are quite low <br>across the region, so one would only need 0.75-1" precipitable <br>water values to saturate the atmosphere. When combined with slow- <br>moving low- to mid-level frontogenesis across PA in particular, <br>heavy rainfall with possible areas of snow through dynamic cooling could <br>ensue. MU CAPE is only sufficient for issues from a vertically- <br>derived instability standpoint down near the VA/NC border, but <br>slantwise convection could be a problem for areas farther north. In <br>theory, hourly rain totals up to 1" with local amounts to 3" are <br>possible. In such situations in the past, the convective band that <br>forms could be quite narrow which makes placement especially <br>difficult to discern at this time horizon. Not helping matters are <br>mass field differences between the guidance as the mid- to upper- <br>level low is attempting to close off as the upstream ridge is <br>beginning to falter in strength, which would normally side against <br>a more southerly solution like the 00z NAM. Even so, there is <br>enough agreement on the heavy rain potential through the various <br>pieces of guidance, when combined with the ingredients above, to <br>maintain the Marginal Risk from continuity. Should model mass <br>fields converge and snow becomes less of a factor, an upgrade to a <br>Slight Risk may be worth considering as some areas of the northern <br>Mid- Atlantic States have quite low flash flood guidance (northern <br>NJ, west- central PA, and the Southern Tier of NY). <br> <br>Roth <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>248 AM EDT Wed Apr 9 2025 <br> <br> <br>The low pressure system emerging off the southern New England coast <br>this weekend will likely keep widespread light to moderate rainfall <br>across the Northeast U.S., especially on Saturday with the <br>heaviest rainfall beginning to exit the Cape Cod region. Higher <br>elevation snow is likely for the northern Appalachians through the <br>weekend with several inches of accumulation possible. With most of <br>the heaviest rainfall expected on Friday, it appears unlikely that <br>there will be any excessive rainfall concerns going into <br>Saturday/Day 4, so no risk areas are warranted. An even less <br>eventful rainfall forecast is expected for Sunday/Day 5, and <br>therefore no risk areas are necessary as well, even though there <br>will likely be a swath of moderate rainfall across the northern <br>tier states with the surface low moving through. <br> <br>Elsewhere across the Continental U.S., several inches of snowfall <br>is likely across the higher terrain of the Northern Rockies through <br>the weekend as the upper low moves across the region. The front <br>moving across the central Plains and Midwest will not have much <br>moisture or instability to work with, so rainfall associated with <br>it should be mainly light. There may be an increase in shower <br>coverage across portions of the southern Plains by the middle of <br>next week as a potential wave of low pressure develops along the <br>front, but does not look impressive at this time. <br> <br>The mid-upper level ridge axis exiting the Rockies and across the <br>Plains through the upcoming weekend will support widespread above <br>normal temperatures from the Desert Southwest to the central and <br>northern Plains. Highs could reach into the 90s from western Texas <br>to eastern Colorado and western Kansas, before the cold front <br>brings readings closer to climatology for Monday. The warmth then <br>encompasses the Midwest to the Deep South to start the week and <br>then it reaches the East Coast by Tuesday, with highs about 5-15 <br>degrees above average. However, widespread cloud cover over the <br>weekend will tend to keep things cooler than mid-April standards <br>across the Eastern U.S. before things moderate next week. <br> <br>Hamrick <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>248 AM EDT Wed Apr 9 2025 <br> <br> <br>The low pressure system emerging off the southern New England coast <br>this weekend will likely keep widespread light to moderate rainfall <br>across the Northeast U.S., especially on Saturday with the <br>heaviest rainfall beginning to exit the Cape Cod region. Higher <br>elevation snow is likely for the northern Appalachians through the <br>weekend with several inches of accumulation possible. With most of <br>the heaviest rainfall expected on Friday, it appears unlikely that <br>there will be any excessive rainfall concerns going into <br>Saturday/Day 4, so no risk areas are warranted. An even less <br>eventful rainfall forecast is expected for Sunday/Day 5, and <br>therefore no risk areas are necessary as well, even though there <br>will likely be a swath of moderate rainfall across the northern <br>tier states with the surface low moving through. <br> <br>Elsewhere across the Continental U.S., several inches of snowfall <br>is likely across the higher terrain of the Northern Rockies through <br>the weekend as the upper low moves across the region. The front <br>moving across the central Plains and Midwest will not have much <br>moisture or instability to work with, so rainfall associated with <br>it should be mainly light. There may be an increase in shower <br>coverage across portions of the southern Plains by the middle of <br>next week as a potential wave of low pressure develops along the <br>front, but does not look impressive at this time. <br> <br>The mid-upper level ridge axis exiting the Rockies and across the <br>Plains through the upcoming weekend will support widespread above <br>normal temperatures from the Desert Southwest to the central and <br>northern Plains. Highs could reach into the 90s from western Texas <br>to eastern Colorado and western Kansas, before the cold front <br>brings readings closer to climatology for Monday. The warmth then <br>encompasses the Midwest to the Deep South to start the week and <br>then it reaches the East Coast by Tuesday, with highs about 5-15 <br>degrees above average. However, widespread cloud cover over the <br>weekend will tend to keep things cooler than mid-April standards <br>across the Eastern U.S. before things moderate next week. <br> <br>Hamrick <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 04/09/2025 - 12Z 04/10/2025</snippet> </div><div id='TABday2S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/10/2025 - 12Z 04/11/2025</snippet> </div><div id='TABday3S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/11/2025 - 12Z 04/12/2025</snippet> </div><div id='TABday4S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/12/2025 - 12Z 04/13/2025</snippet> </div><div id='TABday5S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/13/2025 - 12Z 04/14/2025</snippet> </div><div id='TABday6S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/14/2025 - 12Z 04/15/2025</snippet> </div><div id='TABday7S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/15/2025 - 12Z 04/16/2025</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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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"> <br>Probabilistic Heavy Snow and Icing Discussion <br>NWS Weather Prediction Center College Park MD <br>340 AM EDT Wed Apr 9 2025 <br> <br>Valid 12Z Wed Apr 09 2025 - 12Z Sat Apr 12 2025 <br> <br> <br>...Great Lakes & Interior Northeast... <br>Days 1-2... <br> <br>A fast approaching upper-level trough producing modest PVA aloft <br>at the same time as the diffluent left-exit region of a 120kt jet <br>streak moves in over the Great Lakes Wednesday afternoon and <br>through Wednesday night. As a wave of low pressure tracks east <br>along a strenghtening low-level warm front, a swath of <br>precipitation along the warm front and on the northern flank of the <br>storm will be capable of producing periods of snow. The setup <br>continues to feature very marginal boundary layer temperatures, <br>making it essential for dynamic cooling and the transition to snow <br>after sunset Wednesday evening to help snow accumulate. The wide <br>ranging solutions in guidance include little to no snow or as much <br>as several inches from southern Wisconsin on east to southern <br>Michigan and both northern Indiana and Ohio (showcasing the <br>complexities of the setup detailed above). WPC probabilities show <br>low chances (10-30%) for snowfall totals >2" across southern <br>Michigan, while most areas in the Lower Great Lakes see a coating <br>to 2" throughout the Lower Great Lakes. <br> <br>A similar setup for light snow occurs over the Northeast mountains <br>Wednesday night into Thursday. Mountain ranges such as the <br>Catskills, Adirondacks, and Berkshires could see between a coating <br>to 2" of snowfall through Thursday night. A break in the snow <br>arrives Friday morning before another round of mountain snow <br>arrives late Friday into Saturday. <br> <br> <br>...Northern & Central Appalachians... <br>Day 3... <br> <br>As the upper-level trough over the Ohio Valley deepens Thursday <br>night, excellent upper-level divergence via PVA ahead of an <br>embedded shortave disturbance will spawn a strengthening area of <br>low pressure in the Mid-Atlantic. Out ahead of the upper trough is <br>an IVT >400 kg/m/s that will deliver copious amounts of moisture <br>into the northern Mid-Atlantic and Northeast Friday and into <br>Saturday. While there is some residual sub-freezing air in the <br>Northeast, there is only enough to support snow in the more <br>elevated terrain of the central and northern Appalachians. <br>Elevations above 2,000ft are most favored for snowfall, but some <br>areas as low as 1,000ft in elevations could see rain transition to <br>snow Friday night. This is a sensitive setup given the time of year <br>with lack of sub-freezing temps and dynamic cooling being <br>necessary to support heavier snowfall rates. WPC probabilities show <br>10-20% chances for snowfall >2" in the tallest peaks of the <br>Catskills, Adirondacks, Green, and White Mountains through Saturday <br>morning. <br> <br> <br>WPC probabilities for ice accumulations above 0.1" throughout the <br>CONUS are less than 10%. <br> <br> <br>Mullinax <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <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>» <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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var newvaltime = new Array(); if (nam == 'mxt') { //display max temp newimgsrc = ["..\/medr\/DAY3_MAX_filled.gif","..\/medr\/DAY4_MAX_filled.gif","..\/medr\/DAY5_MAX_filled.gif","..\/medr\/DAY6_MAX_filled.gif","..\/medr\/DAY7_MAX_filled.gif"]; newvaltime = ["Valid Sat Apr 12, 2025","Valid Sun Apr 13, 2025","Valid Mon Apr 14, 2025","Valid Tue Apr 15, 2025","Valid Wed Apr 16, 2025"]; } else if (nam =='mxta') { //display max temp anom newimgsrc = ["..\/medr\/DAY3_MAX_ANOM_filled.gif","..\/medr\/DAY4_MAX_ANOM_filled.gif","..\/medr\/DAY5_MAX_ANOM_filled.gif","..\/medr\/DAY6_MAX_ANOM_filled.gif","..\/medr\/DAY7_MAX_ANOM_filled.gif"]; newvaltime = ["Valid Sat Apr 12, 2025","Valid Sun Apr 13, 2025","Valid Mon Apr 14, 2025","Valid Tue Apr 15, 2025","Valid Wed Apr 16, 2025"]; } else if (nam =='mnt') { //display min temp newimgsrc = ["..\/medr\/DAY3_MIN_filled.gif","..\/medr\/DAY4_MIN_filled.gif","..\/medr\/DAY5_MIN_filled.gif","..\/medr\/DAY6_MIN_filled.gif","..\/medr\/DAY7_MIN_filled.gif"]; newvaltime = ["Valid Sat Apr 12, 2025","Valid Sun Apr 13, 2025","Valid Mon Apr 14, 2025","Valid Tue Apr 15, 2025","Valid Wed Apr 16, 2025"]; 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} else { //display default fronts/pressures newimgsrc = ["..\/medr\/9jhwbg_conus.gif","..\/medr\/9khwbg_conus.gif","..\/medr\/9lhwbg_conus.gif","..\/medr\/9mhwbg_conus.gif","..\/medr\/9nhwbg_conus.gif"]; newvaltime = ["Valid 12Z Sat Apr 12, 2025","Valid 12Z Sun Apr 13, 2025","Valid 12Z Mon Apr 14, 2025","Valid 12Z Tue Apr 15, 2025","Valid 12Z Wed Apr 16, 2025"]; } //change sources in html var numprod = 5; for (i = 0; i < numprod; i++) { var idnum = i + 1; var imgid = 'medimg' + idnum ; var valtimeid = 'TABday' + idnum + 'S-med'; document.getElementById(imgid).src = newimgsrc[i]; document.getElementById(valtimeid).innerHTML = newvaltime[i]; } } </script>  <div> <div id='TABday1G-med' style='display:block;'><img class='display-img-max' src='../medr/9jhwbg_conus.gif' id='medimg1' alt='Day 1 image not available'></div><div id='TABday2G-med' style='display:none;'><img class='display-img-max' src='../medr/9khwbg_conus.gif' id='medimg2' alt='Day 2 image not available'></div><div id='TABday3G-med' style='display:none;'><img class='display-img-max' src='../medr/9lhwbg_conus.gif' id='medimg3' alt='Day 3 image not available'></div><div id='TABday4G-med' style='display:none;'><img class='display-img-max' src='../medr/9mhwbg_conus.gif' id='medimg4' alt='Day 4 image not available'></div><div id='TABday5G-med' style='display:none;'><img class='display-img-max' src='../medr/9nhwbg_conus.gif' id='medimg5' alt='Day 5 image not available'></div> </div>  <div id='links-med' class='links-max'> <a onclick="javascript:displaylinks('dlinks-med-disco')" href="javascript:;"> + Forecast Discussion</a><br> <div id="dlinks-med-disco" style="display: none"> <div class="dlinks-disco"> Extended Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>248 AM EDT Wed Apr 9 2025 <br> <br>Valid 12Z Sat Apr 12 2025 - 12Z Wed Apr 16 2025 <br> <br> <br>...General Overview... <br> <br>An amplified upper level trough will be in place across the East <br>Coast for the upcoming weekend, with a surface low off the Mid- <br>Atlantic coast that will track in the general direction of Nova <br>Scotia by early next weekend. Meanwhile, an upper ridge will be in <br>place across the Plains that will support warm conditions for this <br>time of year. An incoming upper trough across the northern Rockies <br>will then spur surface cyclogenesis across the central/northern <br>Plains by Sunday with a cold front crossing the Intermountain West. <br>The cold front should then reach the south-central U.S. by Tuesday <br>morning with the upper ridge breaking down. Another trough is <br>likely to reach the West Coast region during the Tuesday to <br>Wednesday time period, but uncertainty is higher on its evolution. <br> <br>...Guidance/Predictability Assessment... <br> <br>The 00Z model guidance suite has come into better agreement with <br>the trough axis crossing the northwestern states over the weekend. <br>The 12Z CMC was a slow outlier and not used beyond day 4 given its <br>timing differences, but the new 00Z run is in much better <br>agreement. This also holds true for the potential closed upper low <br>near the Desert Southwest late in the forecast period, but still <br>remains more uncertain than other parts of the country. For the <br>system across the East Coast this weekend, the GFS it a bit <br>farther northwest with the surface low across the northern Mid- <br>Atlantic, and the CMC more offshore, but otherwise good agreement <br>noted for this region. <br> <br>The WPC fronts and pressures forecast was derived mainly from a <br>GFS/ECMWF/UKMET/previous WPC blend for this weekend, and then <br>mainly GFS/ECMWF and their respective ensemble means going forward <br>into the first half of next week, with means up to about 60% by <br>Wednesday. <br> <br>...Weather/Hazards Highlights... <br> <br>The low pressure system emerging off the southern New England coast <br>this weekend will likely keep widespread light to moderate rainfall <br>across the Northeast U.S., especially on Saturday with the <br>heaviest rainfall beginning to exit the Cape Cod region. Higher <br>elevation snow is likely for the northern Appalachians through the <br>weekend with several inches of accumulation possible. With most of <br>the heaviest rainfall expected on Friday, it appears unlikely that <br>there will be any excessive rainfall concerns going into <br>Saturday/Day 4, so no risk areas are warranted. An even less <br>eventful rainfall forecast is expected for Sunday/Day 5, and <br>therefore no risk areas are necessary as well, even though there <br>will likely be a swath of moderate rainfall across the northern <br>tier states with the surface low moving through. <br> <br>Elsewhere across the Continental U.S., several inches of snowfall <br>is likely across the higher terrain of the Northern Rockies through <br>the weekend as the upper low moves across the region. The front <br>moving across the central Plains and Midwest will not have much <br>moisture or instability to work with, so rainfall associated with <br>it should be mainly light. There may be an increase in shower <br>coverage across portions of the southern Plains by the middle of <br>next week as a potential wave of low pressure develops along the <br>front, but does not look impressive at this time. <br> <br>The mid-upper level ridge axis exiting the Rockies and across the <br>Plains through the upcoming weekend will support widespread above <br>normal temperatures from the Desert Southwest to the central and <br>northern Plains. Highs could reach into the 90s from western Texas <br>to eastern Colorado and western Kansas, before the cold front <br>brings readings closer to climatology for Monday. The warmth then <br>encompasses the Midwest to the Deep South to start the week and <br>then it reaches the East Coast by Tuesday, with highs about 5-15 <br>degrees above average. However, widespread cloud cover over the <br>weekend will tend to keep things cooler than mid-April standards <br>across the Eastern U.S. before things moderate next week. <br> <br>Hamrick <br> <br> <br>Additional 3-7 Day Hazard information can be found on the WPC <br>medium 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 href="/lowclusters/lowclusters.php" target="_blank"> <div class="collab-tools-border-right"> <div class="collab-tools-title">Automated Forecast Low Clusters</div> <div class="collab-tools-image"> <img class='collab-tools-image-logo' src='/lowclusters/lowclusters_latest.png' alt='Latest Automated Forecast Low Clusters' /> </div> <div class="collab-tools-des"> <p>Displays 0-72 hour cyclone forecast positions from global ensemble and deterministic model guidance. </div> </div> </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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