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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 is a Marginal Risk of Excessive Rainfall on Day 2' class='marginal'><a href='/qpf/ero.php?opt=curr&day=2' target='_blank'>Marginal</a></td><td headers='hz-daythree' title='There are No Risk Areas of Excessive Rainfall on Day 3' class='threats'><a href='/qpf/ero.php?opt=curr&day=3' target='_blank'>No Area</a></td> </tr> <tr><td headers='hz-hazards'>Heavy Snow (≥ 4”)</td><td headers='hz-dayone' title='There is a High Risk of Snow Accumulations ≥ 4” on Day 1' class='high'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=1&ftype=probabilities' target='_blank'>High</a></td><td headers='hz-daytwo' title='There is a High Risk of Snow Accumulations ≥ 4” on Day 2' class='high'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=2&ftype=probabilities' target='_blank'>High</a></td><td headers='hz-daythree' title='There are No Risk Areas of Snow Accumulations ≥ 4” on Day 3' class='threats'><a href='/pwpf/wwd_accum_probs.php?fpd=24&ptype=snow&amt=1&day=3&ftype=probabilities' target='_blank'>No Area</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 Mon Apr 7, 2025</div><div id='TABday2S-ovw' style='display: none' class='display-validtime'><br>Valid Tue Apr 8, 2025</div><div id='TABday3S-ovw' style='display: none' class='display-validtime'><br>Valid Wed Apr 9, 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 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 00Z Mon Apr 07, 2025</div><div id='TABday2S-sfc' style='display: none' 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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 = ["00","03","06","09","12","15","18","21","00"]; var oldimgsrc = ["\/archives\/sfc\/2025\/namussfc2025040700.gif","\/sfc\/namussfc03wbg.gif","\/sfc\/namussfc06wbg.gif","\/sfc\/namussfc09wbg.gif","\/sfc\/namussfc12wbg.gif","\/sfc\/namussfc15wbg.gif","\/sfc\/namussfc18wbg.gif","\/sfc\/namussfc21wbg.gif","\/sfc\/namussfc00wbg.gif"]; //info to grab from archives var ayear = "2025"; var afilename = "2025040700"; //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/namussfc2025040700.gif' id='sfcimg1' alt='Day 1 image not available'></div><div id='TABday2G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc03wbg.gif' id='sfcimg2' alt='Day 2 image not available'></div><div id='TABday3G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc06wbg.gif' id='sfcimg3' alt='Day 3 image not available'></div><div id='TABday4G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc09wbg.gif' id='sfcimg4' alt='Day 4 image not available'></div><div id='TABday5G-sfc' style='display:none;'><img class='display-img-max' src='/sfc/namussfc12wbg.gif' id='sfcimg5' alt='Day 5 image not available'></div><div 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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 00Z Tue Apr 08, 2025</div><div id='TABday2S-frt' style='display: none' class='display-validtime'>Valid 06Z Tue Apr 08, 2025</div><div id='TABday3S-frt' style='display: none' class='display-validtime'>Valid 12Z Tue Apr 08, 2025</div><div id='TABday4S-frt' style='display: none' class='display-validtime'>Valid 18Z Tue Apr 08, 2025</div><div id='TABday5S-frt' style='display: none' class='display-validtime'>Valid 00Z Wed Apr 09, 2025</div><div id='TABday6S-frt' style='display: none' class='display-validtime'>Valid 12Z Wed Apr 09, 2025</div><div id='TABday7S-frt' style='display: none' class='display-validtime'>Valid 00Z Thu Apr 10, 2025</div><div id='TABday8S-frt' style='display: none' class='display-validtime'>Valid 12Z Thu Apr 10, 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 class="navbar" id="fordays"> <ul id="minitabs"> <li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday1','12')" class="overviewf" onfocus="show_tab('frt','TABday1','12')" id="firstf" alt="Day1"><span id="TABday1T-frt" class="active-forecast">00ZTue</span></a></li><li class="cforday"><span class='nav-vline'> </span><a href="#" OnMouseOver="show_tab('frt','TABday2','12')" class="overviewf" onfocus="show_tab('frt','TABday2','12')" alt="Day2"><span id="TABday2T-frt" class="blank">06ZTue</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday3','12')" class="overviewf" onfocus="show_tab('frt','TABday3','12')" alt="Day3"><span 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class="overviewf" onfocus="show_tab('frt','TABday8','12')" alt="Day8"><span id="TABday8T-frt" class="blank">12ZThu</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday9','12')" class="overviewf" onfocus="show_tab('frt','TABday9','12')" alt="Day9"><span id="TABday9T-frt" class="blank">12ZFri</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday10','12')" class="overviewf" onfocus="show_tab('frt','TABday10','12')" alt="Day10"><span id="TABday10T-frt" class="blank">12ZSat</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday11','12')" class="overviewf" onfocus="show_tab('frt','TABday11','12')" alt="Day11"><span id="TABday11T-frt" class="blank">12ZSun</span></a></li><li class="cforday"><a href="#" OnMouseOver="show_tab('frt','TABday12','12')" class="overviewf" onfocus="show_tab('frt','TABday12','12')" alt="Day12"><span id="TABday12T-frt" class="blank">12ZMon</span></a></li> </ul> </div> </div>    <div> <div id='TABday1G-frt' style='display:block;'><img class='display-img-max' src='../sfc/usfntsfc00wbg.gif' id='frtimg1' alt='Day 1 image not available'></div><div id='TABday2G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/93fndfd_init_2025040712.gif ' id='frtimg2' alt='Day 2 image not available'></div><div id='TABday3G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/94fndfd_init_2025040712.gif ' id='frtimg3' alt='Day 3 image not available'></div><div id='TABday4G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/95fndfd_init_2025040712.gif ' id='frtimg4' alt='Day 4 image not available'></div><div id='TABday5G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/96fndfd_init_2025040712.gif ' id='frtimg5' alt='Day 5 image not available'></div><div id='TABday6G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/98fndfd_init_2025040712.gif ' id='frtimg6' alt='Day 6 image not available'></div><div id='TABday7G-frt' style='display:none;'><img class='display-img-max' src='../basicwx/99fndfd_init_2025040712.gif ' id='frtimg7' alt='Day 7 image not available'></div><div id='TABday8G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf072.gif' id='frtimg8' alt='Day 8 image not available'></div><div id='TABday9G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf096.gif' id='frtimg9' alt='Day 9 image not available'></div><div id='TABday10G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf120.gif' id='frtimg10' alt='Day 10 image not available'></div><div id='TABday11G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf144.gif' id='frtimg11' alt='Day 11 image not available'></div><div id='TABday12G-frt' style='display:none;'><img class='display-img-max' src='../medr/display/wpcwx+frontsf168.gif' id='frtimg12' alt='Day 12 image not available'></div> </div>  <div id='links-frt' class='links-max'> <a onclick="javascript:displaylinks('dlinks-frtsr-disco')" href="javascript:;"> + Short Range Forecast Discussion (Day ½-2½)</a><br> <div id="dlinks-frtsr-disco" style="display: none"> <div class="dlinks-disco"> Short Range Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>408 PM EDT Mon Apr 07 2025 <br> <br>Valid 00Z Tue Apr 08 2025 - 00Z Thu Apr 10 2025 <br> <br>...Showers and thunderstorms come to an end across the East Coast tonight; <br>lingers over south Florida... <br> <br>...Winter weather returns to parts of the Great Lakes and interior <br>Northeast/northern New England through Tuesday... <br> <br>...Strong cold front brings much colder temperatures to the Eastern U.S.... <br> <br>...Unsettled weather continues over the Northwest... <br> <br> <br>A low pressure system responsible for severe weather and excessive <br>rainfall across the Midwest over the past several days will produce some <br>final showers and thunderstorms along the East Coast tonight before moving <br>off into the Atlantic. The southern portion of the attendant cold front <br>will hang up over south Florida and generate scattered thunderstorm <br>activity across the region through Tuesday. Temperatures will drop well <br>below average over the eastern half of the country compounding issues <br>posed by flooding over parts of the Ohio Valley tonight and Tuesday night, <br>when overnight minimums may drop below freezing. Highs in the 30s and 40s <br>will represent a 20-30 degree departure from average for much of the Ohio <br>Valley, interior Northeast and Central Appalachians. <br> <br>A secondary system will produce snow showers downwind of the Great Lakes <br>through Tuesday. The heaviest snow should accumulate over interior <br>portions of the Northeast (downwind of Lake Ontario, Adirondacks, northern <br>New England) where 4-8 inches of snow are expected. A series of systems <br>will continue to bring unsettled weather to the Northwest through early <br>Wednesday morning. Low elevation rain, isolated thunderstorms and high <br>elevation snow showers are likely. <br> <br> <br>Kebede <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>300 PM EDT Mon Apr 7 2025 <br> <br>Valid 12Z Thu Apr 10 2025 - 12Z Mon Apr 14 2025 <br> <br> <br>...General Overview... <br> <br>The large upper trough that will be in place across the Northeast <br>U.S. early in the week is forecast to lift out of the region by <br>Thursday. An amplifying shortwave trough originating from south- <br>central Canada is expected to amplify as it drops southeast across <br>the Ohio Valley, to support a surface low from the Midwest to the <br>Mid-Atlantic coast to close out the work week and emerging off the <br>coast next Saturday. Meanwhile, an upper level ridge builds across <br>the Intermountain West and Rockies Thursday into Friday, and then <br>shifts eastward to the Plains by next weekend. With the ridge <br>departing the West, an upper trough approaches from the Pacific <br>Northwest and supports a cold front crossing the Intermountain West <br>to the central/northern Plains through next Monday. <br> <br> <br>...Guidance/Predictability Assessment... <br> <br>The latest models and ensembles remain in good agreement at least <br>through the first half of the period, showing a departing Eastern <br>trough only to be replaced with an amplifying shortwave established <br>over the East by Saturday. Models suggest a brief closed low over <br>the East this weekend and then some increased uncertainty in timing <br>and placement of the main energy as it exits the Northeast early <br>next week. The next trough enters the Northwest by Saturday, and <br>the past several runs of the CMC has been notably slower with this. <br>By Monday, the CMC has a closed low still over the interior West, <br>while the GFS and ECMWF (with support from the ensemble means) is <br>well east into the Upper Midwest by that point. <br> <br>The WPC blend for today utilized a deterministic model blend for <br>Days 3 and 4, bringing in the ensemble means in place of the CMC by <br>Day 5. Gradually increased contributions of the ensemble means for <br>late period, but still maintained a 50/50 deterministic (GFS and <br>ECMWF)/ensemble mean blend. This maintained good agreement with the <br>previous shift as well. <br> <br> <br>...Weather/Hazards Highlights... <br> <br>The low pressure system crossing the Ohio Valley and then reaching <br>the East Coast to close out the week will be the next event to <br>monitor, with widespread showers expected from the Deep South to <br>the Great Lakes on Thursday. Even though forecast rainfall totals <br>are not expected to be heavy, the ground will likely still be quite <br>saturated for many of those areas affected by the prolific recent <br>rainfall, so that is something that will continue to be monitored, <br>but for now no risk areas appear warranted for the Day 4/Thursday <br>excessive rainfall outlook. Colder high pressure held over the <br>Northeast interior in advance of the system may allow for some <br>terrain focusing snow chances. 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 Virginia to New <br>England into next weekend. A Marginal Risk area continues for Day <br>5/Friday from NJ/PA northward to southern New England with more of <br>an enhanced QPF signal in the deterministic guidance, with perhaps <br>1-2 inches of rainfall. <br> <br>Elsewhere across the country, periods of moderate rain and <br>mountain snow return to western Washington and Oregon courtesy of <br>onshore flow and a shortwave passage Thursday, but this does not <br>look like a major event at this time. Light snow then reaches the <br>higher elevations of the northern Rockies by next weekend as the <br>moisture moves inland. Dry conditions are forecast from the <br>Southwestern U.S. to the central/southern Plains during the entire <br>forecast period. <br> <br>In terms of temperatures, a moderating trend commences by the end <br>of the week across the Eastern U.S. as the upper trough lifts out <br>of New England. Looking ahead to next weekend, lows should be near <br>average while daytime highs remain slightly below average with <br>increased cloud cover. Meanwhile, a warm pattern is expected for <br>the Western U.S. through the end of the week with both daytime <br>highs and overnight lows about 10-20 degrees above average, with <br>the greatest anomalies over the Great Basin on Friday. These milder <br>conditions then reach the central and northern Plains by next <br>weekend as the ridge shifts eastward. <br> <br>Santorelli/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>258 AM EDT Mon Apr 7 2025 <br> <br>Valid 00Z Tue 8 Apr 2025 - 00Z Tue 15 Apr 2025 <br> <br>Surface high pressure rebuilds northwest of the state near 30-35 <br>degrees north through early in the week, with mainly ENE trade <br>wind flow expected, and then the high becomes centered north of <br>the state by Thursday into Friday and more easterly flow, with <br>good overall model agreement across the Hawaii domain. A weakness <br>likely develops in the subtropical ridge axis by Sunday north of <br>the state, with some reduction in the trades possible. <br> <br>In terms of rainfall prospects, mainly trade wind induced showers <br>can be expected most days across the windward terrain. The <br>ensemble means suggest an upper trough could develop near 150 <br>degrees west by midweek, and this may result in a slightly greater <br>coverage of showers during this time, but nothing major expected. <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) { 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id='TABday5S-ero' style='display: none' class='display-validtime'>Valid 12Z Fri Apr 11 2025 - 12Z Sat Apr 12 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="#" 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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>826 PM EDT Mon Apr 7 2025 <br>Day 1 <br>Valid 01Z Tue Apr 08 2025 - 12Z Tue Apr 08 2025 <br> <br>...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL ACROSS EASTERN <br>NORTH CAROLINA INTO FAR SOUTHEAST VIRGINIA... <br> <br>Convection will move across eastern NC through the evening hours <br>posing a localized minor flood risk. Strengthening low level <br>convergence and some southwest to northeast training should result <br>in total rainfall amounts generally in the 1-3" range, with hourly <br>rainfall as high as 1.5". Given the high FFG over this region, it <br>seems unlikely that the forecast rainfall will exceed FFG. However <br>2-3" of total rain and 1.5" in an hour could be enough to result <br>in localized minor flooding in susceptible urban or low lying <br>areas. <br> <br>Chenard <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>826 PM EDT Mon Apr 7 2025 <br>Day 2 <br>Valid 12Z Tue Apr 08 2025 - 12Z Wed Apr 09 2025 <br> <br>...A MARGINAL RISK OF EXCESSIVE RAINFALL EXISTS IN SOUTHERN <br>FLORIDA... <br> <br> <br>...1930 UTC Update... <br>Based on the 12Z guidance, particularly the HREF and its suite of <br>especially the exceedance probabilities, have trimmed the Marginal <br>Risk a little to include far southeast FL from Homestead to West <br>Palm Beach. This given the anticipated frontal progression and the <br>fact that the bulk of the heaviest rainfall after 12Z Tue will be <br>east towards the northern Bahamas. 12Z model QPFs follow suit, <br>especially the CAMs, as the 12Z HREF probabilities of QPF greater <br>than 3" in 24 hours (12Z Tue-12Z Wed) now shows only a sliver of <br>30-40% right along the coast along and north of Pompano Beach. <br> <br> <br>...0800 UTC Discussion... <br>Deep southwest flow is expected ahead of an advancing cold front <br>across the FL Peninsula. Precipitable water values of 1.75-2" are <br>forecast to reside here, and ML CAPE should maximize in the <br>2000-3000 J/kg range per NAM guidance. Low- level inflow and <br>effective bulk shear are sufficient for convective organization. <br>Whether or not a flash flood risk fully materializes depends upon <br>whether or not an East Coast seabreeze front can develop and focus <br>convection, which could anchor convection in the large urban area <br>of South FL as it is unlikely to progress inland within this <br>synoptic pattern. In this sort of atmosphere, hourly rain totals to <br>2.5" and overall totals to 5" are possible. The 00z HREF does have <br>some non- zero probabilities of 5"+ totals across sections of the <br>northern Keys, while the 3"+ probabilities are more prominent along <br>the Gold Coast. Considering the urban environment, ingredients <br>available, and mesoscale guidance signal, added a Marginal Risk to <br>South FL and the Upper Keys as a precaution as isolated to widely <br>scattered flash flooding appears possible. <br> <br>Roth <br> <br> <br>Day 2 threat area: <a href="https://www.wpc.ncep.noaa.gov/qpf/98epoints.txt"<u>www.wpc.ncep.noaa.gov/qpf/98epoints.txt</u></a> <br></div><div id='TABday3D-ero' class='dlinks-disco' style='display: none'> <br>Excessive Rainfall Discussion <br>NWS Weather Prediction Center College Park MD <br>826 PM EDT Mon Apr 7 2025 <br>Day 3 <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>...Southern Illinois... <br>Conceptually, there is a non-zero threat of heavy rainfall in and <br>near southern IL Wednesday evening as precipitable water values <br>rise near to above 1" within a region with 1000-500 hPa thickness <br>near 5550 meters, implying a completely saturated troposphere. MU <br>CAPE is expected to rise above 250 J/kg per NAM guidance, which <br>tends to be under-forecast at this time range. The area will still <br>be attempting to dry out from recent heavy rainfall/ saturated <br>soils. However, there is only about a six hour window for heavy <br>rain concerns to materialize near the parent cyclone's associated <br>frontal boundary before it moves through. There is the potential <br>for hourly rain totals to maximize near 1.5". The guidance is this <br>time range QPF-wise is underwhelming, so no risk area was <br>depicted. However, this may change as we move closer in time into <br>the high resolution guidance window. <br> <br> <br>Roth <br> <br>Day 3 threat area: <a href="https://www.wpc.ncep.noaa.gov/qpf/99epoints.txt"<u>www.wpc.ncep.noaa.gov/qpf/99epoints.txt</u></a> <br></div><div id='TABday4D-ero' class='dlinks-disco' style='display: none'>Extended Forecast Discussion <br>NWS Weather Prediction Center College Park MD <br>300 PM EDT Mon Apr 7 2025 <br> <br> <br>The low pressure system crossing the Ohio Valley and then reaching <br>the East Coast to close out the week will be the next event to <br>monitor, with widespread showers expected from the Deep South to <br>the Great Lakes on Thursday. Even though forecast rainfall totals <br>are not expected to be heavy, the ground will likely still be quite <br>saturated for many of those areas affected by the prolific recent <br>rainfall, so that is something that will continue to be monitored, <br>but for now no risk areas appear warranted for the Day 4/Thursday <br>excessive rainfall outlook. Colder high pressure held over the <br>Northeast interior in advance of the system may allow for some <br>terrain focusing snow chances. 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 Virginia to New <br>England into next weekend. A Marginal Risk area continues for Day <br>5/Friday from NJ/PA northward to southern New England with more of <br>an enhanced QPF signal in the deterministic guidance, with perhaps <br>1-2 inches of rainfall. <br> <br>Elsewhere across the country, periods of moderate rain and <br>mountain snow return to western Washington and Oregon courtesy of <br>onshore flow and a shortwave passage Thursday, but this does not <br>look like a major event at this time. Light snow then reaches the <br>higher elevations of the northern Rockies by next weekend as the <br>moisture moves inland. Dry conditions are forecast from the <br>Southwestern U.S. to the central/southern Plains during the entire <br>forecast period. <br> <br>In terms of temperatures, a moderating trend commences by the end <br>of the week across the Eastern U.S. as the upper trough lifts out <br>of New England. Looking ahead to next weekend, lows should be near <br>average while daytime highs remain slightly below average with <br>increased cloud cover. Meanwhile, a warm pattern is expected for <br>the Western U.S. through the end of the week with both daytime <br>highs and overnight lows about 10-20 degrees above average, with <br>the greatest anomalies over the Great Basin on Friday. These milder <br>conditions then reach the central and northern Plains by next <br>weekend as the ridge shifts eastward. <br> <br>Santorelli/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>300 PM EDT Mon Apr 7 2025 <br> <br> <br>The low pressure system crossing the Ohio Valley and then reaching <br>the East Coast to close out the week will be the next event to <br>monitor, with widespread showers expected from the Deep South to <br>the Great Lakes on Thursday. Even though forecast rainfall totals <br>are not expected to be heavy, the ground will likely still be quite <br>saturated for many of those areas affected by the prolific recent <br>rainfall, so that is something that will continue to be monitored, <br>but for now no risk areas appear warranted for the Day 4/Thursday <br>excessive rainfall outlook. Colder high pressure held over the <br>Northeast interior in advance of the system may allow for some <br>terrain focusing snow chances. 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 Virginia to New <br>England into next weekend. A Marginal Risk area continues for Day <br>5/Friday from NJ/PA northward to southern New England with more of <br>an enhanced QPF signal in the deterministic guidance, with perhaps <br>1-2 inches of rainfall. <br> <br>Elsewhere across the country, periods of moderate rain and <br>mountain snow return to western Washington and Oregon courtesy of <br>onshore flow and a shortwave passage Thursday, but this does not <br>look like a major event at this time. Light snow then reaches the <br>higher elevations of the northern Rockies by next weekend as the <br>moisture moves inland. Dry conditions are forecast from the <br>Southwestern U.S. to the central/southern Plains during the entire <br>forecast period. <br> <br>In terms of temperatures, a moderating trend commences by the end <br>of the week across the Eastern U.S. as the upper trough lifts out <br>of New England. Looking ahead to next weekend, lows should be near <br>average while daytime highs remain slightly below average with <br>increased cloud cover. Meanwhile, a warm pattern is expected for <br>the Western U.S. through the end of the week with both daytime <br>highs and overnight lows about 10-20 degrees above average, with <br>the greatest anomalies over the Great Basin on Friday. These milder <br>conditions then reach the central and northern Plains by next <br>weekend as the ridge shifts eastward. <br> <br>Santorelli/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(); 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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>407 PM EDT Mon Apr 7 2025 <br> <br>Valid 00Z Tue Apr 08 2025 - 00Z Fri Apr 11 2025 <br> <br>...Interior Northeast... <br>Days 1,2... <br> <br>A compact low tracking from Lake Huron this afternoon east along <br>the Canadian border and across Maine through Tuesday afternoon will <br>cause an area of mostly light snow to fall along its track, as most <br>locations near the track stay below freezing, favoring mostly snow <br>as the precipitation type. The initial front is largely over the <br>Ontario Peninsula (the area bounded between Lakes Huron, Erie, and <br>Ontario) at the time of this writing. Temperatures with this band <br>are largely above freezing, so any snow embedded within it is not <br>sticking, especially to roads. Going into tonight, however, without <br>solar insulation, it's likely on the higher elevations of the <br>Chautauqua Ridge, and eventually Adirondacks and points further <br>east, snow will begin sticking and have some impacts. <br> <br>The greatest impact from this low for most areas is likely to be <br>the potential for flash freezing. As sub-freezing air moves in with <br>the snow, road/ground temperatures could rapidly drop, resulting in <br>a thin glaze of ice on some colder surfaces. This of course may <br>have travel impacts. With the snow itself, in some of the stronger <br>convective cells, visibility in any snow may drop enough to cause <br>travel impacts as the winds with the snow and cold front become <br>gusty. Fortunately, the snow is not expected to become very strong, <br>as a stronger low along the moisture plume off the Eastern Seaboard <br>saps a lot of energy from this polar low as they track parallel to <br>one another. <br> <br>As far as snow amounts are concerned, impacts from this low will <br>start tonight, increase through the day Tuesday, then peak Tuesday <br>evening as the snow rates wane as the parent low moves off to the <br>east. A few inches of accumulation are possible in the valleys from <br>the Champlain Valley east to coastal Maine. Meanwhile, locally <br>much greater impacts from much higher accumulations are expected <br>from the Tug Hill Plateau of central New York to the west, to the <br>Adirondacks, the northern Greens and Whites of VT and NH, <br>respectively, and much of western Maine. Local accumulations on the <br>highest elevations could approach a foot of new snow by the time <br>the snow is all said and done. <br> <br>WPC Probabilities are moderate-to-high (50-70%) across far northern <br>New Hampshire and much of western Maine for 6 inches or more of <br>snow. Since the heaviest snow will be falling during the day <br>further west across northern New York and Vermont, those <br>percentages are much lower (10-30%) in those mountains. Minor <br>impacts are expected in these areas, though where snow falls <br>heavier in any convective snow showers, locally greater impacts are <br>probable. <br> <br>...Great Lakes... <br>Days 1-3... <br> <br>Extensive lake-effect snow is expected behind the aforementioned <br>low that is moving through the Great Lakes currently. 850 mb temps <br>will be falling to the west (cold side) of the low to between -12C <br>and -18C across all of the Great Lakes tonight. Despite this being <br>the climatologically unfavored time of year for lake-effect (due to <br>usual warm air in place over the cold lakes), the air will be cold <br>enough in this case for all of the lakes to support multiple bands <br>and cellular lake-effect convection from the U.P. of Michigan, <br>where lake-effect snow is ongoing presently, to western Michigan <br>off its namesake lake, and later tonight off the lower lakes <br>through the Chautauqua Ridge and Tug Hill Plateau. As usual with <br>lake-effect, the typical impacts such as rapidly reduced <br>visibilities, snow-covered roads, and blowing snow are likely in <br>the aforementioned impacted areas. The heaviest lake-effect and <br>greatest snowfall amounts are expected on the Tug Hill where <br>amounts approaching 10 inches are possible through Tuesday. <br> <br>A developing low along a slow-moving warm front extending from the <br>Arrowhead of Minnesota through southern lower Michigan and <br>eventually into portions of northern New York may cause additional <br>areas of snow Wednesday Night into Thursday morning. As is typical <br>during April, temperatures will be hovering right around freezing, <br>so precipitation type between snow and rain will be a major <br>determining factor as to accumulations in any one area. A general <br>1-3 inches of snow are possible in these areas from the low and <br>front. <br> <br> <br>...Northern Rockies and Cascades... <br>Days 1,2... <br> <br>A pair of shortwave troughs rotating east along the base of a <br>longwave trough over the northeast Pacific will direct plumes of <br>Pacific moisture into the Pacific Northwest through Wednesday. Snow <br>is expected to remain at higher elevations, especially over the <br>Olympics and Cascades. Higher elevations such as Mt. Rainier may <br>see multiple feet of snow through the period due to very persistent <br>and heavy upslope snow. Accumulations will be extremely elevation <br>dependent, as many valley locations see mostly rain or snow light <br>enough to not be able to stick to warm surfaces. Measurable snow <br>will impact many of the mountain ranges of the Pacific Northwest, <br>including the Blue, Sawtooth, Bitterroots, Absaroka, Teton, and <br>Lewis Ranges. Strong ridging building in behind the troughs by <br>Wednesday and Wednesday night will end any remaining high elevation <br>snow. <br> <br> <br>Wegman <br> <br> <br> <br> </div> </div> <a onclick="javascript:displaylinks('dlinks-wwx')" href="javascript:;"> + Additional Links</a> <div id="dlinks-wwx" style="display: none"> <ul class="linkslist"> <li>» <a href="/wwd/wso" target="_blank">Experimental Winter Storm Outlook</a></li> <li>» <a href="/wwd/wssi/prob_wssi.php" target="_blank">Probabilistic Winter Storm Severity Index</a></li> <li>» <a href="../verification/winwx/winwx.php" alt="Product Verification">Product Verification</a></li> <li>» <a href="../archives/web_pages/winwx/get_winwx_images.php" alt="Product Archive">Product Archive</a></li> <li>» <a href="../wwd/about.shtml" alt="Product Info">Product Info</a></li> <li>» <a href="../wwd/winter_wx.shtml" alt="Other Products">Other Winter Weather Products</a></li> </ul> </div> </div> </div> </div> <div class="product-content-new" id="med">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).keydown( function(e) { if (e.keyCode == 39) { $(".overviewm:focus").closest('li').next().find('a.overviewm').focus(); 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var newvaltime = new Array(); if (nam == 'mxt') { //display max temp newimgsrc = ["..\/medr\/DAY3_MAX_filled.gif","..\/medr\/DAY4_MAX_filled.gif","..\/medr\/DAY5_MAX_filled.gif","..\/medr\/DAY6_MAX_filled.gif","..\/medr\/DAY7_MAX_filled.gif"]; newvaltime = ["Valid Thu Apr 10, 2025","Valid Fri Apr 11, 2025","Valid Sat Apr 12, 2025","Valid Sun Apr 13, 2025","Valid Mon Apr 14, 2025"]; } else if (nam =='mxta') { //display max temp anom newimgsrc = ["..\/medr\/DAY3_MAX_ANOM_filled.gif","..\/medr\/DAY4_MAX_ANOM_filled.gif","..\/medr\/DAY5_MAX_ANOM_filled.gif","..\/medr\/DAY6_MAX_ANOM_filled.gif","..\/medr\/DAY7_MAX_ANOM_filled.gif"]; newvaltime = ["Valid Thu Apr 10, 2025","Valid Fri Apr 11, 2025","Valid Sat Apr 12, 2025","Valid Sun Apr 13, 2025","Valid Mon Apr 14, 2025"]; } else if (nam =='mnt') { //display min temp newimgsrc = ["..\/medr\/DAY3_MIN_filled.gif","..\/medr\/DAY4_MIN_filled.gif","..\/medr\/DAY5_MIN_filled.gif","..\/medr\/DAY6_MIN_filled.gif","..\/medr\/DAY7_MIN_filled.gif"]; newvaltime = ["Valid Thu Apr 10, 2025","Valid Fri Apr 11, 2025","Valid Sat Apr 12, 2025","Valid Sun Apr 13, 2025","Valid Mon Apr 14, 2025"]; 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An amplifying shortwave trough originating from south- <br>central Canada is expected to amplify as it drops southeast across <br>the Ohio Valley, to support a surface low from the Midwest to the <br>Mid-Atlantic coast to close out the work week and emerging off the <br>coast next Saturday. Meanwhile, an upper level ridge builds across <br>the Intermountain West and Rockies Thursday into Friday, and then <br>shifts eastward to the Plains by next weekend. With the ridge <br>departing the West, an upper trough approaches from the Pacific <br>Northwest and supports a cold front crossing the Intermountain West <br>to the central/northern Plains through next Monday. <br> <br> <br>...Guidance/Predictability Assessment... <br> <br>The latest models and ensembles remain in good agreement at least <br>through the first half of the period, showing a departing Eastern <br>trough only to be replaced with an amplifying shortwave established <br>over the East by Saturday. Models suggest a brief closed low over <br>the East this weekend and then some increased uncertainty in timing <br>and placement of the main energy as it exits the Northeast early <br>next week. The next trough enters the Northwest by Saturday, and <br>the past several runs of the CMC has been notably slower with this. <br>By Monday, the CMC has a closed low still over the interior West, <br>while the GFS and ECMWF (with support from the ensemble means) is <br>well east into the Upper Midwest by that point. <br> <br>The WPC blend for today utilized a deterministic model blend for <br>Days 3 and 4, bringing in the ensemble means in place of the CMC by <br>Day 5. Gradually increased contributions of the ensemble means for <br>late period, but still maintained a 50/50 deterministic (GFS and <br>ECMWF)/ensemble mean blend. This maintained good agreement with the <br>previous shift as well. <br> <br> <br>...Weather/Hazards Highlights... <br> <br>The low pressure system crossing the Ohio Valley and then reaching <br>the East Coast to close out the week will be the next event to <br>monitor, with widespread showers expected from the Deep South to <br>the Great Lakes on Thursday. Even though forecast rainfall totals <br>are not expected to be heavy, the ground will likely still be quite <br>saturated for many of those areas affected by the prolific recent <br>rainfall, so that is something that will continue to be monitored, <br>but for now no risk areas appear warranted for the Day 4/Thursday <br>excessive rainfall outlook. Colder high pressure held over the <br>Northeast interior in advance of the system may allow for some <br>terrain focusing snow chances. 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 Virginia to New <br>England into next weekend. A Marginal Risk area continues for Day <br>5/Friday from NJ/PA northward to southern New England with more of <br>an enhanced QPF signal in the deterministic guidance, with perhaps <br>1-2 inches of rainfall. <br> <br>Elsewhere across the country, periods of moderate rain and <br>mountain snow return to western Washington and Oregon courtesy of <br>onshore flow and a shortwave passage Thursday, but this does not <br>look like a major event at this time. Light snow then reaches the <br>higher elevations of the northern Rockies by next weekend as the <br>moisture moves inland. Dry conditions are forecast from the <br>Southwestern U.S. to the central/southern Plains during the entire <br>forecast period. <br> <br>In terms of temperatures, a moderating trend commences by the end <br>of the week across the Eastern U.S. as the upper trough lifts out <br>of New England. Looking ahead to next weekend, lows should be near <br>average while daytime highs remain slightly below average with <br>increased cloud cover. Meanwhile, a warm pattern is expected for <br>the Western U.S. through the end of the week with both daytime <br>highs and overnight lows about 10-20 degrees above average, with <br>the greatest anomalies over the Great Basin on Friday. These milder <br>conditions then reach the central and northern Plains by next <br>weekend as the ridge shifts eastward. <br> <br>Santorelli/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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