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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 08</th><th id='hz-daytwo'>Apr 09</th><th id='hz-daythree'>Apr 10</th> </tr> </thead> <tbody> <tr class="odd"> <td headers='hz-hazards'>Excessive Rainfall</td> <td headers='hz-dayone' title='There is a Marginal Risk of Excessive Rainfall on Day 1' class='marginal'><a href='/qpf/ero.php?opt=curr&day=1' target='_blank'>Marginal</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 Slight Risk of Snow Accumulations ≥ 4” on Day 2' class='slight'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=2&ftype=probabilities' target='_blank'>Slight</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 Tue Apr 8, 2025</div><div id='TABday2S-ovw' style='display: none' class='display-validtime'><br>Valid Wed Apr 9, 2025</div><div id='TABday3S-ovw' style='display: none' class='display-validtime'><br>Valid Thu Apr 10, 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='/discussions/nfdscc2.html' target='_blank'><div class='news-list-border'><img id='highlightimg' class='news-logo-img-yes' src='../para/css/images/stormsummary_rain.gif' alt='headline0' /><br>Latest Summary for Mid-South to Ohio Valley to Southeast Multi-Day Heavy Rain Event.</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 18Z Mon Apr 07, 2025</div><div id='TABday2S-sfc' style='display: none' class='display-validtime'>Analyzed at 21Z Mon Apr 07, 2025</div><div id='TABday3S-sfc' style='display: none' class='display-validtime'>Analyzed at 00Z Tue Apr 08, 2025</div><div id='TABday4S-sfc' style='display: none' class='display-validtime'>Analyzed at 03Z Tue Apr 08, 2025</div><div id='TABday5S-sfc' style='display: none' class='display-validtime'>Analyzed at 06Z Tue Apr 08, 2025</div><div id='TABday6S-sfc' style='display: none' class='display-validtime'>Analyzed at 09Z Tue Apr 08, 2025</div><div id='TABday7S-sfc' style='display: none' class='display-validtime'>Analyzed at 12Z Tue Apr 08, 2025</div><div id='TABday8S-sfc' style='display: none' class='display-validtime'>Analyzed at 15Z Tue Apr 08, 2025</div><div id='TABday9S-sfc' style='display: block' class='display-validtime'>Analyzed at 18Z Tue Apr 08, 2025</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 = ["18","21","00","03","06","09","12","15","18"]; var oldimgsrc = ["\/archives\/sfc\/2025\/namussfc2025040718.gif","\/sfc\/namussfc21wbg.gif","\/sfc\/namussfc00wbg.gif","\/sfc\/namussfc03wbg.gif","\/sfc\/namussfc06wbg.gif","\/sfc\/namussfc09wbg.gif","\/sfc\/namussfc12wbg.gif","\/sfc\/namussfc15wbg.gif","\/sfc\/namussfc18wbg.gif"]; //info to grab from archives var ayear = "2025"; var afilename = "2025040718"; //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/namussfc2025040718.gif' id='sfcimg1' alt='Day 1 image not available'></div><div id='TABday2G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc21wbg.gif' id='sfcimg2' alt='Day 2 image not available'></div><div id='TABday3G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc00wbg.gif' id='sfcimg3' alt='Day 3 image not available'></div><div id='TABday4G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc03wbg.gif' id='sfcimg4' alt='Day 4 image not available'></div><div id='TABday5G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc06wbg.gif' id='sfcimg5' alt='Day 5 image not available'></div><div id='TABday6G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc09wbg.gif' id='sfcimg6' alt='Day 6 image not available'></div><div id='TABday7G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc12wbg.gif' id='sfcimg7' alt='Day 7 image not available'></div><div id='TABday8G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc15wbg.gif' id='sfcimg8' alt='Day 8 image not available'></div><div id='TABday9G-sfc' style='display:block;'><img class='display-img-max' src='/sfc/namussfc18wbg.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 18Z Tue Apr 08, 2025</div><div id='TABday2S-frt' style='display: none' class='display-validtime'>Valid 00Z Wed Apr 09, 2025</div><div id='TABday3S-frt' style='display: none' class='display-validtime'>Valid 06Z Wed Apr 09, 2025</div><div id='TABday4S-frt' style='display: none' class='display-validtime'>Valid 12Z Wed Apr 09, 2025</div><div id='TABday5S-frt' style='display: none' class='display-validtime'>Valid 18Z Wed Apr 09, 2025</div><div id='TABday6S-frt' style='display: none' class='display-validtime'>Valid 00Z Thu Apr 10, 2025</div><div id='TABday7S-frt' style='display: none' class='display-validtime'>Valid 12Z Thu Apr 10, 2025</div><div id='TABday8S-frt' style='display: none' class='display-validtime'>Valid 00Z Fri Apr 11, 2025</div><div id='TABday9S-frt' style='display: none' class='display-validtime'>Valid 12Z Fri Apr 11, 2025</div><div id='TABday10S-frt' style='display: none' class='display-validtime'>Valid 12Z Sat Apr 12, 2025</div><div id='TABday11S-frt' style='display: none' class='display-validtime'>Valid 12Z Sun Apr 13, 2025</div><div id='TABday12S-frt' style='display: none' class='display-validtime'>Valid 12Z Mon Apr 14, 2025</div><div id='TABday13S-frt' style='display: none' class='display-validtime'>Valid 12Z Tue Apr 15, 2025</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">18ZTue</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">00ZWed</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">06ZWed</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">12ZWed</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">18ZWed</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">00ZThu</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">12ZThu</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">00ZFri</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">12ZFri</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">12ZSat</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">12ZSun</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">12ZMon</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">12ZTue</span></a></li> </ul> </div> </div>    <div> <div id='TABday1G-frt' style='display:block;'><img class='display-img-max' src='../sfc/usfntsfc18wbg.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_2025040812.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_2025040812.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_2025040812.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_2025040812.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_2025040812.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_2025040812.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_2025040812.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>415 PM EDT Tue Apr 08 2025 <br> <br>Valid 00Z Wed Apr 09 2025 - 00Z Fri Apr 11 2025 <br> <br> <br>...The Midwest and East Coast remain below average in temperatures.... <br> <br>...A series of fronts moving across the Plains and Midwest will bring <br>chances for thunderstorms, showers, and mixed precipitation... <br> <br>...West remains mostly dry and seasonably warm for the middle of this week <br>... <br> <br> <br>A cold front passage earlier today has reinforced a cooler airmass present <br>across much of the Ohio Valley and East Coast. In general, these regions <br>will remain around 10-15 degrees cooler than average for early April. <br>Tomorrow morning will see the coldest temperatures for the upcoming week <br>as low temperatures in the 20s will be abundant across the Northeast and <br>Mid-Atlantic, while the Mid-South could also freezing temperatures with <br>lows in the 30s. As growing season has started for many with the arrival <br>of Spring. Freeze Warnings are active for many from Indiana southwards to <br>Alabama and eastward to the great state of Maryland. Populations still <br>recovering from the recent storm should take cold weather precautions if <br>there is not adequate shelter. Low temperatures will begin to modify <br>across the Tennessee and Ohio Valley and reach the 40s by middle week and <br>high temperatures will warm into the 60s and low 70s before a cold front <br>moves into the region on Thursday and brings cooler weather once again. <br>Temperatures across the upper Midwest to the Mid-Atlantic will be cooler <br>as high temperatures remain in the 40s and 50s through the middle of the <br>week with troughing dominant across the region. <br> <br>A series of weak areas low pressures and fronts will dive southeast from <br>the Plains today and move towards the Midwest on Wednesday and the East <br>Coast on Thursday. Some general thunderstorms will be possible across the <br>Plains for today, and then rain showers and snow showers/ wintry mix will <br>be possible on Wednesday across the Midwest and rain showers for the East <br>Coast starting Thursday. Farther south across the Tennessee Valley on <br>Thursday, there will be more instability ahead of the system, and the <br>Storm Prediction Center has a Marginal Risk for hazards of hail and gusty <br>winds. The area of low pressure located along a front moving across the <br>Eastern Seaboard will then begin to deepen and bring blustery and wet <br>conditions for Friday into the weekend. <br> <br>The West Coast will see high pressure dominate the region. Temperatures <br>from the Plains to the Pacific will be as warm as 20-25 degrees above <br>average for early April. Temperatures in the 60s and 70s will be present <br>across much of the West Coast to the central Plains. Across Southern <br>California, Arizona, New Mexico, and Texas, temperatures will be warm to <br>hot. Temperatures in the upper 90s, even low 100s, will be common in the <br>Desert Southwest across the next several days. West and Central Texas <br>could see high temperatures in the middle 90s. The next storm system will <br>enter the Pacific Northwest on Thursday and bring the chances for rain. <br> <br> <br>Wilder <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>259 PM EDT Tue Apr 8 2025 <br> <br>Valid 12Z Fri Apr 11 2025 - 12Z Tue Apr 15 2025 <br> <br> <br>...General Overview... <br> <br>The forecast shows moderate progression with two significant <br>weather systems of note. The leading one involves digging <br>Canada/Great Lakes energy within an amplified trough, forming a <br>closed low over the central Appalachians and Mid-Atlantic by late <br>this week into the weekend. Associated surface low pressure will <br>likely track just off the East Coast during the weekend, with this <br>system producing organized rainfall and perhaps localized high <br>elevation snow. A trailing upper ridge should progress from the <br>Intermountain West/Rockies to the East Coast during the period. <br>Then an upper trough reaching the Pacific Northwest by Saturday <br>will support the second system that should develop over the Plains <br>during the weekend and track through the upper Great Lakes into <br>east-central Canada early next week. Most of this system's rain and <br>higher elevation snow will likely extend over and east-northeast <br>from the northern Rockies. Most rain with the trailing cold front <br>should be fairly light. Another upper trough with more uncertain <br>specifics may reach the West Coast around next Tuesday. <br> <br>...Guidance/Predictability Assessment... <br> <br>Models and ensembles from the 00Z/06Z cycles continued to agree <br>fairly well for the general pattern through the period. However <br>meaningful embedded differences persist for individual systems. <br>These include the leading one affecting the East Coast, the upper <br>trough and associated surface system progressing from the Northeast <br>into the Great Lakes/Canada Saturday-Tuesday, and the upper trough <br>reaching near the West Coast by next Tuesday. Guidance comparisons <br>and continuity favored an early-mid period blend consisting of 40 <br>percent 00Z ECMWF and a remaining even split among the 06Z GFS/00Z <br>UKMET/00Z CMC. Clustering ultimately favored a shift toward 60 <br>percent total 06Z GFS and 12Z/07 ECMWF relative to 40 percent 06Z <br>GEFS/00Z ECens means by next Tuesday. <br> <br>For the East Coast system, individual dynamical and machine <br>learning (ML) models show varying detail/position differences <br>without pronounced clustering. At least there is a general theme <br>toward the system having less northward elongation/precipitation <br>extent than depicted by latest GFS runs. The new 12Z UKMET strays <br>northeast with the upper low versus most other solutions by Sunday <br>while the 12Z ECMWF/CMC and GEFS mean maintain an upper low path <br>across the Mid-Atlantic. <br> <br>Meanwhile guidance still shows important detail differences for <br>the evolution of shortwave energy reaching the Northwest by <br>Saturday. GFS/CMC runs have been forming an embedded upper low over <br>or near the northern Rockies by Sunday, with the 12Z ICON also <br>showing this (and with the farthest south track later on). UKMET <br>runs (and the 12Z GEFS mean) have had an intermediate upper low <br>track along the Canadian border while faster ECMWF runs wait until <br>farther eastward near the Canadian border to form the low by <br>Monday. Most ML models favor waiting until after Sunday to form an <br>upper low, and with a track near the Canadian border. The preferred <br>solution leans toward an intermediate evolution--an upper low near <br>the Canadian border, Plains low pressure between the weaker ECMWF <br>and deeper GFS/CMC, and eventually slower timing than the 00Z and <br>new 12Z ECMWF (12Z/07 ECMWF closer to the majority cluster by next <br>Tuesday). Northern tier QPF also reflects an intermediate idea <br>between the GFS/CMC versus ECMWF extremes. <br> <br>By late in the period, individual dynamical/ML models and <br>ensembles develop a lot of spread for the character of troughing <br>that may approach the West Coast. This is also the case for leading <br>energy that may pull off from the southern part of the weekend <br>shortwave. At this point there is no meaningful consensus or <br>continuity regarding how much stream separation may occur within <br>the trough and where this separation may occur. The updated blend <br>valid next Tuesday shows some mid-latitude separation based on <br>preferences to the east but confidence along the West Coast is very <br>low and future cycles are likely to reflect different ideas for <br>specifics. <br> <br>...Weather/Hazards Highlights... <br> <br>The low pressure system exiting the Ohio Valley and reaching the <br>East Coast to close out the week will be the next system to monitor <br>for meaningful sensible weather. A deepening coastal low near the <br>Mid-Atlantic Coast on Friday and into early Saturday should bring <br>higher rain chances and breezy conditions from the Carolinas to New <br>England. A Marginal Risk area continues for Day 4/Friday from <br>Maryland northward to southern New England with more of an enhanced <br>QPF signal in the deterministic guidance, with perhaps 1-2 inches <br>of rainfall for some areas. New guidance continues to show some <br>spread for specifics but the best clustering and ensemble <br>probabilities recommend no change for the current Marginal Risk <br>area at this time. Higher elevation snowfall is also likely across <br>northern New England Friday night into Saturday. The rainfall <br>becomes lighter in general by Saturday (with additional spread for <br>details) across the Northeast, and the Day 5 ERO still reflects no <br>risk areas. <br> <br>The forecast over and east of the northern Rockies from Saturday <br>onward depends on the specifics of potential upper low formation <br>within the trough supporting Plains low pressure development by <br>Sunday. Current preferences lie between the extremes, represented <br>by the GFS/CMC that produce some areas of heavy rain higher <br>elevation snow--due to earlier and farther south upper low <br>formation--versus the much lighter ECMWF and most ML models which <br>maintain an open upper trough until forming a closed low farther <br>eastward. For the most part, the trailing cold front should not <br>have a lot of moisture to work with so any associated rainfall over <br>the central and eastern U.S. should be on the lighter side. <br> <br>Some light precipitation could reach parts of the West Coast by <br>late Monday or Tuesday, depending on very uncertain specifics of <br>incoming Pacific shortwave energy. Monitor future forecasts as <br>guidance eventually refines the details aloft and associated <br>precipitation. <br> <br>In terms of temperatures, the Western U.S. into northern High <br>Plains will see a warm pattern for the end of the week with both <br>daytime highs and overnight lows about 10-20 degrees above average, <br>with some readings potentially 25 degrees above average across <br>portions of Wyoming and Montana. The warmth will reach the central <br>and northern Plains by the weekend as the upper ridge shifts <br>eastward, with widespread 15-25 degree positive anomalies across <br>the Central Plains and Midwest by Sunday. The amplified upper <br>trough initially over the East will keep highs at some locations up <br>to 10-15 degrees or so below normal Friday-Saturday before a <br>steady warmer trend to moderately above normal readings early next <br>week. Cooler air behind the Northwest U.S. front eventually pushing <br>into the East will bring temperatures down to near or slightly <br>below normal. A trailing upper ridge building into the West early <br>next week should support a rebound to somewhat above normal <br>temperatures over the region. <br> <br>Rausch/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>348 AM EDT Tue Apr 8 2025 <br> <br>Valid 00Z Wed 09 Apr 2025 - 00Z Wed 16 Apr 2025 <br> <br>Surface high pressure rebuilds north of the state near 35 degrees <br>north through the end of the week, with mainly east to ENE trade <br>wind flow expected, with good overall model agreement across the <br>Hawaii domain. A weakness likely develops in the subtropical ridge <br>axis by Sunday north of the state, with some reduction in the <br>trades possible. In terms of rainfall prospects, mainly trade <br>wind induced showers can be expected most days across the windward <br>terrain. There may be some heavier showers across the central and <br>northern Islands going into Thursday night and Friday, but does <br>not appear to be a major event. <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(); 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href="#" OnMouseOver="show_tab('qpfsix','TABday10','12')" class="overview" alt="Day10"><span id="TABday10T-qpfsix" class="blank">06-12Z</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('qpfsix','TABday11','12')" class="overview" alt="Day11"><span id="TABday11T-qpfsix" class="blank">12-18Z</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('qpfsix','TABday12','12')" class="overview" alt="Day12"><span id="TABday12T-qpfsix" class="blank">18-00Z</span></a></li> </ul> </div> <!!-- qpf-opt4: 48-hourlys (Day 4-5 and Day 6-7 --> <div class="navbar" id="fordays-qpf-opt4" style='display:none;'> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('qpf48','TABday1','2')" class="overview" alt="Day1"><span id="TABday1T-qpf48" class="active-forecast">Day 4/5</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('qpf48','TABday2','2')" class="overview" alt="Day2"><span id="TABday2T-qpf48" class="blank">Day 6/7</span></a></li> </ul> </div> </div>  <div id= "options-wrapper" class="options-wrapper"> <div id="options-tab-qpf" class="options-off"> <div class="options-container"> <div class="options-inner1"> <a onclick="javascript:displayoptions('qpf');" href="javascript:;"><img class="options-icon" src="para/para_css/images/options.png" alt="options"/></a> </div> <div id="opts-qpf" class="options-inner2" style="display: none"> Image Options: <div class="options-form"> <form> <input id="qpf-opt1" type="radio" name="format" value="opt1" onclick="javascript:imgformatqpf('opt1');" checked ><label for="qpf-opt1">24 Hour/Multi Day QPF</label><br> <input id="qpf-opt2" type="radio" name="format" value="opt2" onclick="javascript:imgformatqpf('opt2');"><label for="qpf-opt2">12-Hourly QPF (Day 1-3)</label> <br> <input id="qpf-opt3" type="radio" name="format" value="opt3" onclick="javascript:imgformatqpf('opt3');"><label for="qpf-opt3">6-Hourly QPF (Day 1-3)</label> <br> <input id="qpf-opt4" type="radio" name="format" value="opt4" onclick="javascript:imgformatqpf('opt4');"><label for="qpf-opt4">48-Hour QPF (Day 4-5/6-7)</label> <br> </form> </div> <div class='options-form2'><a href="../pqpf/conus_hpc_pqpf.php" target="_blank"> » Probabilistic QPF (Day 1-3)</a></div> <div class='options-form3'><a href="/qpf/epm/extreme_precip_monitor.php" target="_blank"> » Extreme Precipitation<br>   Monitor</a></div> </div> </div> </div> </div>  <script> function imgformatqpf(nam) { var prodval; var prodnav; var prodimg; prodval = "validtimes-qpf-" + nam; prodnav = "fordays-qpf-" + nam; prodimg = "forimg-qpf-" + nam; //Change valid times document.getElementById("validtimes-qpf-opt1").style.display= "none"; document.getElementById("validtimes-qpf-opt2").style.display= "none"; document.getElementById("validtimes-qpf-opt3").style.display= "none"; document.getElementById("validtimes-qpf-opt4").style.display= "none"; document.getElementById(prodval).style.display = "block"; //Change navbar 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src='../qpf/hpcqpf_2025040900_12hr_f054.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_2025040900_12hr_f060.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_2025040900_12hr_f066.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_2025040900_12hr_f072.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 Tue Apr 08 2025 - 12Z Wed Apr 09 2025</div><div id='TABday2S-ero' style='display: none' class='display-validtime'>Valid 12Z Wed Apr 09 2025 - 12Z Thu Apr 10 2025</div><div id='TABday3S-ero' style='display: none' class='display-validtime'>Valid 12Z Thu Apr 10 2025 - 12Z Fri Apr 11 2025</div><div id='TABday4S-ero' style='display: none' class='display-validtime'>Valid 12Z Fri Apr 11 2025 - 12Z Sat Apr 12 2025</div><div id='TABday5S-ero' style='display: none' class='display-validtime'>Valid 12Z Sat Apr 12 2025 - 12Z Sun Apr 13 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>416 PM EDT Tue Apr 8 2025 <br>Day 1 <br>Valid 16Z Tue Apr 08 2025 - 12Z Wed Apr 09 2025 <br> <br>...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL FOR PORTIONS OF <br>SOUTH FLORIDA... <br> <br>...16z update... <br> <br>Excessive rainfall potential will likely remain confined to peak <br>heating hours prior to 00z (8pm EDT) today. Convective ingredients <br>remain almost the same as the overnight issuance with some subtle <br>downward trends on PWATs (1-1.5") and CAPE (1000-2000 J/kg). Thus, <br>non NAM CONEST CAMs have suggested drier/more progressive solutions <br>in QPF. Localized flash flooding is still possible due to a potential <br>synoptic seabreeze--cold front connection. <br> <br>Kebede <br> <br> <br>...Previous Discussion... <br> <br>Deep southwest flow is occurring ahead of an advancing cold front <br>across the FL Peninsula this morning. Precipitable water values <br>have increased to 1.7-1.9" in association with the front, and SB <br>CAPE should maximize in the 2000-2500 J/kg range per the 00z HREF. <br>Low-level inflow (non-zero) and effective bulk shear (20-40 kts) <br>are more than sufficient for convective organization, across South <br>FL typically, and whether or not a localized flash flood risk <br>fully materializes depends upon whether or not an East Coast <br>seabreeze front can develop and focus convection with the well- <br>timed arrival of the front (near peak daytime heating), which <br>could anchor convection in the large urban area of South FL as it <br>is unlikely to progress inland within this synoptic pattern. In <br>this sort of atmosphere, hourly rain totals to 2.5" (as depicted by <br>CAMs) and overall totals to 5" are possible (as 00z HREF 40-km <br>neighborhood probabilities for 3" exceedance are as high as 30-60% <br>along the immediate Gold Coast. Considering the urban environment, <br>ingredients available, and mesoscale guidance signal, maintained <br>the inherited Marginal Risk for South FL. <br> <br>Churchill/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>416 PM EDT Tue Apr 8 2025 <br>Day 2 <br>Valid 12Z Wed Apr 09 2025 - 12Z Thu Apr 10 2025 <br> <br>The probability of rainfall exceeding flash flood guidance is less <br>than 5 percent. <br> <br>Kebede <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>416 PM EDT Tue Apr 8 2025 <br>Day 3 <br>Valid 12Z Thu Apr 10 2025 - 12Z Fri Apr 11 2025 <br> <br>The probability of rainfall exceeding flash flood guidance is less <br>than 5 percent. <br> <br>Kebede <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>259 PM EDT Tue Apr 8 2025 <br> <br> <br>The low pressure system exiting the Ohio Valley and reaching the <br>East Coast to close out the week will be the next system to monitor <br>for meaningful sensible weather. A deepening coastal low near the <br>Mid-Atlantic Coast on Friday and into early Saturday should bring <br>higher rain chances and breezy conditions from the Carolinas to New <br>England. A Marginal Risk area continues for Day 4/Friday from <br>Maryland northward to southern New England with more of an enhanced <br>QPF signal in the deterministic guidance, with perhaps 1-2 inches <br>of rainfall for some areas. New guidance continues to show some <br>spread for specifics but the best clustering and ensemble <br>probabilities recommend no change for the current Marginal Risk <br>area at this time. Higher elevation snowfall is also likely across <br>northern New England Friday night into Saturday. The rainfall <br>becomes lighter in general by Saturday (with additional spread for <br>details) across the Northeast, and the Day 5 ERO still reflects no <br>risk areas. <br> <br>The forecast over and east of the northern Rockies from Saturday <br>onward depends on the specifics of potential upper low formation <br>within the trough supporting Plains low pressure development by <br>Sunday. Current preferences lie between the extremes, represented <br>by the GFS/CMC that produce some areas of heavy rain higher <br>elevation snow--due to earlier and farther south upper low <br>formation--versus the much lighter ECMWF and most ML models which <br>maintain an open upper trough until forming a closed low farther <br>eastward. For the most part, the trailing cold front should not <br>have a lot of moisture to work with so any associated rainfall over <br>the central and eastern U.S. should be on the lighter side. <br> <br>Some light precipitation could reach parts of the West Coast by <br>late Monday or Tuesday, depending on very uncertain specifics of <br>incoming Pacific shortwave energy. Monitor future forecasts as <br>guidance eventually refines the details aloft and associated <br>precipitation. <br> <br>In terms of temperatures, the Western U.S. into northern High <br>Plains will see a warm pattern for the end of the week with both <br>daytime highs and overnight lows about 10-20 degrees above average, <br>with some readings potentially 25 degrees above average across <br>portions of Wyoming and Montana. The warmth will reach the central <br>and northern Plains by the weekend as the upper ridge shifts <br>eastward, with widespread 15-25 degree positive anomalies across <br>the Central Plains and Midwest by Sunday. The amplified upper <br>trough initially over the East will keep highs at some locations up <br>to 10-15 degrees or so below normal Friday-Saturday before a <br>steady warmer trend to moderately above normal readings early next <br>week. Cooler air behind the Northwest U.S. front eventually pushing <br>into the East will bring temperatures down to near or slightly <br>below normal. A trailing upper ridge building into the West early <br>next week should support a rebound to somewhat above normal <br>temperatures over the region. <br> <br>Rausch/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>259 PM EDT Tue Apr 8 2025 <br> <br> <br>The low pressure system exiting the Ohio Valley and reaching the <br>East Coast to close out the week will be the next system to monitor <br>for meaningful sensible weather. A deepening coastal low near the <br>Mid-Atlantic Coast on Friday and into early Saturday should bring <br>higher rain chances and breezy conditions from the Carolinas to New <br>England. A Marginal Risk area continues for Day 4/Friday from <br>Maryland northward to southern New England with more of an enhanced <br>QPF signal in the deterministic guidance, with perhaps 1-2 inches <br>of rainfall for some areas. New guidance continues to show some <br>spread for specifics but the best clustering and ensemble <br>probabilities recommend no change for the current Marginal Risk <br>area at this time. Higher elevation snowfall is also likely across <br>northern New England Friday night into Saturday. The rainfall <br>becomes lighter in general by Saturday (with additional spread for <br>details) across the Northeast, and the Day 5 ERO still reflects no <br>risk areas. <br> <br>The forecast over and east of the northern Rockies from Saturday <br>onward depends on the specifics of potential upper low formation <br>within the trough supporting Plains low pressure development by <br>Sunday. Current preferences lie between the extremes, represented <br>by the GFS/CMC that produce some areas of heavy rain higher <br>elevation snow--due to earlier and farther south upper low <br>formation--versus the much lighter ECMWF and most ML models which <br>maintain an open upper trough until forming a closed low farther <br>eastward. For the most part, the trailing cold front should not <br>have a lot of moisture to work with so any associated rainfall over <br>the central and eastern U.S. should be on the lighter side. <br> <br>Some light precipitation could reach parts of the West Coast by <br>late Monday or Tuesday, depending on very uncertain specifics of <br>incoming Pacific shortwave energy. Monitor future forecasts as <br>guidance eventually refines the details aloft and associated <br>precipitation. <br> <br>In terms of temperatures, the Western U.S. into northern High <br>Plains will see a warm pattern for the end of the week with both <br>daytime highs and overnight lows about 10-20 degrees above average, <br>with some readings potentially 25 degrees above average across <br>portions of Wyoming and Montana. The warmth will reach the central <br>and northern Plains by the weekend as the upper ridge shifts <br>eastward, with widespread 15-25 degree positive anomalies across <br>the Central Plains and Midwest by Sunday. The amplified upper <br>trough initially over the East will keep highs at some locations up <br>to 10-15 degrees or so below normal Friday-Saturday before a <br>steady warmer trend to moderately above normal readings early next <br>week. Cooler air behind the Northwest U.S. front eventually pushing <br>into the East will bring temperatures down to near or slightly <br>below normal. A trailing upper ridge building into the West early <br>next week should support a rebound to somewhat above normal <br>temperatures over the region. <br> <br>Rausch/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 00Z 04/09/2025 - 00Z 04/10/2025</snippet> </div><div id='TABday2S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 00Z 04/10/2025 - 00Z 04/11/2025</snippet> </div><div id='TABday3S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 00Z 04/11/2025 - 00Z 04/12/2025</snippet> </div><div id='TABday4S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/11/2025 - 12Z 04/12/2025</snippet> </div><div id='TABday5S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/12/2025 - 12Z 04/13/2025</snippet> </div><div id='TABday6S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/13/2025 - 12Z 04/14/2025</snippet> </div><div id='TABday7S-wwx' style='display: none' class='display-validtime'> <snippet>Valid 12Z 04/14/2025 - 12Z 04/15/2025</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>222 PM EDT Tue Apr 8 2025 <br> <br>Valid 00Z Wed Apr 09 2025 - 00Z Sat Apr 12 2025 <br> <br> <br>...Northern New England & Maine... <br>Day 1... <br> <br>Low pressure tracking through the St. Lawrence River Valley will <br>direct its strong cold front east across the remainder of New <br>England this afternoon as a compact occluded low slides eastward <br>across Maine this evening. This will prompt a healthy precipitation <br>shield across northern New England and Maine until early <br>Wednesday, when the system weakens and accelerates east over Nova <br>Scotia. <br> <br>The heaviest snowfall rates (1-2"/hr) are expected through about <br>06Z Wednesday as a combination of favorable upslope northwesterly <br>flow across northern New England and an inverted low-to- mid level <br>trough develops across central Maine. Additional snowfall amounts <br>of 3-6" are expected across the northern Greens of VT and Whites of <br>NH/ME as well as a stripe through central ME towards the Interior <br>Downeast. WPC probs for an additional >4" are 30-60% for these <br>areas. <br> <br> <br>...Great Lakes & Interior Northeast... <br>Days 2-3... <br> <br>A complex forecast for much of the Great Lakes from Wednesday into <br>early Thursday, which could lead to a swath of light to locally <br>moderate snowfall. As a 500mb shortwave trough approaches from the <br>west on Wednesday, it will generate modest upper-level divergence <br>at the same time as 850mb FGEN ensues over the Lower Great Lakes. <br>There remains some subtle differences with the evolution of this <br>trough and the interaction of several shortwaves, which could <br>strengthen or weaken the 850mb FGEN. Even if it does snow as with <br>the stronger solutions, marginal boundary layer and surface <br>temperatures will make it tough for snow to accumulate efficiently. <br>WPC probabilities are nonexistent for >4", but have increased for <br>>2" across the southern MI L.P. to 10-30%. Additionally, persistent <br>light precipitation on the northern periphery of the diving <br>shortwaves could produce 1-4" snowfall amounts along the North <br>Shores of Lake Superior. <br> <br>By Thursday night, an amplifying upper trough over the Ohio Valley <br>will develop low pressure over the Carolinas. It will direct a <br>plume of moisture northward into the Northeast that could be <br>sufficiently cold enough to support mountain snow in parts of the <br>Interior Northeast. There remains a fair amount of uncertainty <br>regarding the QPF and if the boundary layer is also sufficiently <br>cold enough to support snow. At the moment, WPC probabilities due <br>show low chances (10-40%) for snowfall >2" in parts of the highest <br>elevations of the Adirondacks, Green, and White Mountains. <br> <br> <br>...Northern Rockies, Cascades, and Olympics... <br>Days 1 & 3... <br> <br>A series of shortwave troughs rotating east at the base of a <br>longwave trough over the northeast Pacific will impose upper-level <br>divergence and direct plumes of Pacific moisture at the <br>Northwestern U.S. mountain ranges through Friday with a brief break <br>Wednesday night. Snow across the Olympics and Cascades will <br>continue tonight as IVT weakens and snow levels fall below 4,000ft. <br>Meanwhile, Pacific moisture will also spill over into the Northern <br>Rockies that results in measurable in mountains such as the Blue, <br>Sawtooth, Bitterroots, Absaroka, Teton, and Lewis Range. Snow <br>should taper off throughout the northwestern U.S. Wednesday <br>afternoon, but look for another round of high- elevation (generally <br>above 5,000ft) snow in the Olympics and Cascades Thursday night as <br>another Pacific disturbance tracks north towards British Columbia. <br> <br>With a lack of a sufficiently cold/dry air-mass in place, look for <br>most snowfall accumulations >6" to be confined to the higher/more <br>remote peaks of the northwestern U.S. mountain ranges. Snowfall <br>accumulations >6" are most likely at elevations >4,000ft in the <br>Olympics and Cascades. Notable passes that could see measurable <br>total snowfall include Snoqualmie and Stevens, where hazardous <br>travel are possible. The snowfall in the Northern Rockies will be <br>light-to-moderate with 1-4" of snowfall most common. Some peaks of <br>the Lewis Range and Absaroka may eclipse 6" by the time snow <br>concludes on Wednesday. <br> <br> <br>WPC probabilities for ice accumulations above 0.1" throughout the <br>CONUS are less than 10%. <br> <br> <br>Snell/Mullinax <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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The leading one involves digging <br>Canada/Great Lakes energy within an amplified trough, forming a <br>closed low over the central Appalachians and Mid-Atlantic by late <br>this week into the weekend. Associated surface low pressure will <br>likely track just off the East Coast during the weekend, with this <br>system producing organized rainfall and perhaps localized high <br>elevation snow. A trailing upper ridge should progress from the <br>Intermountain West/Rockies to the East Coast during the period. <br>Then an upper trough reaching the Pacific Northwest by Saturday <br>will support the second system that should develop over the Plains <br>during the weekend and track through the upper Great Lakes into <br>east-central Canada early next week. Most of this system's rain and <br>higher elevation snow will likely extend over and east-northeast <br>from the northern Rockies. Most rain with the trailing cold front <br>should be fairly light. Another upper trough with more uncertain <br>specifics may reach the West Coast around next Tuesday. <br> <br>...Guidance/Predictability Assessment... <br> <br>Models and ensembles from the 00Z/06Z cycles continued to agree <br>fairly well for the general pattern through the period. However <br>meaningful embedded differences persist for individual systems. <br>These include the leading one affecting the East Coast, the upper <br>trough and associated surface system progressing from the Northeast <br>into the Great Lakes/Canada Saturday-Tuesday, and the upper trough <br>reaching near the West Coast by next Tuesday. Guidance comparisons <br>and continuity favored an early-mid period blend consisting of 40 <br>percent 00Z ECMWF and a remaining even split among the 06Z GFS/00Z <br>UKMET/00Z CMC. Clustering ultimately favored a shift toward 60 <br>percent total 06Z GFS and 12Z/07 ECMWF relative to 40 percent 06Z <br>GEFS/00Z ECens means by next Tuesday. <br> <br>For the East Coast system, individual dynamical and machine <br>learning (ML) models show varying detail/position differences <br>without pronounced clustering. At least there is a general theme <br>toward the system having less northward elongation/precipitation <br>extent than depicted by latest GFS runs. The new 12Z UKMET strays <br>northeast with the upper low versus most other solutions by Sunday <br>while the 12Z ECMWF/CMC and GEFS mean maintain an upper low path <br>across the Mid-Atlantic. <br> <br>Meanwhile guidance still shows important detail differences for <br>the evolution of shortwave energy reaching the Northwest by <br>Saturday. GFS/CMC runs have been forming an embedded upper low over <br>or near the northern Rockies by Sunday, with the 12Z ICON also <br>showing this (and with the farthest south track later on). UKMET <br>runs (and the 12Z GEFS mean) have had an intermediate upper low <br>track along the Canadian border while faster ECMWF runs wait until <br>farther eastward near the Canadian border to form the low by <br>Monday. Most ML models favor waiting until after Sunday to form an <br>upper low, and with a track near the Canadian border. The preferred <br>solution leans toward an intermediate evolution--an upper low near <br>the Canadian border, Plains low pressure between the weaker ECMWF <br>and deeper GFS/CMC, and eventually slower timing than the 00Z and <br>new 12Z ECMWF (12Z/07 ECMWF closer to the majority cluster by next <br>Tuesday). Northern tier QPF also reflects an intermediate idea <br>between the GFS/CMC versus ECMWF extremes. <br> <br>By late in the period, individual dynamical/ML models and <br>ensembles develop a lot of spread for the character of troughing <br>that may approach the West Coast. This is also the case for leading <br>energy that may pull off from the southern part of the weekend <br>shortwave. At this point there is no meaningful consensus or <br>continuity regarding how much stream separation may occur within <br>the trough and where this separation may occur. The updated blend <br>valid next Tuesday shows some mid-latitude separation based on <br>preferences to the east but confidence along the West Coast is very <br>low and future cycles are likely to reflect different ideas for <br>specifics. <br> <br>...Weather/Hazards Highlights... <br> <br>The low pressure system exiting the Ohio Valley and reaching the <br>East Coast to close out the week will be the next system to monitor <br>for meaningful sensible weather. A deepening coastal low near the <br>Mid-Atlantic Coast on Friday and into early Saturday should bring <br>higher rain chances and breezy conditions from the Carolinas to New <br>England. A Marginal Risk area continues for Day 4/Friday from <br>Maryland northward to southern New England with more of an enhanced <br>QPF signal in the deterministic guidance, with perhaps 1-2 inches <br>of rainfall for some areas. New guidance continues to show some <br>spread for specifics but the best clustering and ensemble <br>probabilities recommend no change for the current Marginal Risk <br>area at this time. Higher elevation snowfall is also likely across <br>northern New England Friday night into Saturday. The rainfall <br>becomes lighter in general by Saturday (with additional spread for <br>details) across the Northeast, and the Day 5 ERO still reflects no <br>risk areas. <br> <br>The forecast over and east of the northern Rockies from Saturday <br>onward depends on the specifics of potential upper low formation <br>within the trough supporting Plains low pressure development by <br>Sunday. Current preferences lie between the extremes, represented <br>by the GFS/CMC that produce some areas of heavy rain higher <br>elevation snow--due to earlier and farther south upper low <br>formation--versus the much lighter ECMWF and most ML models which <br>maintain an open upper trough until forming a closed low farther <br>eastward. For the most part, the trailing cold front should not <br>have a lot of moisture to work with so any associated rainfall over <br>the central and eastern U.S. should be on the lighter side. <br> <br>Some light precipitation could reach parts of the West Coast by <br>late Monday or Tuesday, depending on very uncertain specifics of <br>incoming Pacific shortwave energy. Monitor future forecasts as <br>guidance eventually refines the details aloft and associated <br>precipitation. <br> <br>In terms of temperatures, the Western U.S. into northern High <br>Plains will see a warm pattern for the end of the week with both <br>daytime highs and overnight lows about 10-20 degrees above average, <br>with some readings potentially 25 degrees above average across <br>portions of Wyoming and Montana. The warmth will reach the central <br>and northern Plains by the weekend as the upper ridge shifts <br>eastward, with widespread 15-25 degree positive anomalies across <br>the Central Plains and Midwest by Sunday. The amplified upper <br>trough initially over the East will keep highs at some locations up <br>to 10-15 degrees or so below normal Friday-Saturday before a <br>steady warmer trend to moderately above normal readings early next <br>week. Cooler air behind the Northwest U.S. front eventually pushing <br>into the East will bring temperatures down to near or slightly <br>below normal. A trailing upper ridge building into the West early <br>next week should support a rebound to somewhat above normal <br>temperatures over the region. <br> <br>Rausch/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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