Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 337 AM EDT Mon Oct 26 2015 Valid 12Z Mon Oct 26 2015 - 12Z Wed Oct 28 2015 ...Heavy rainfall expected across the Central/Eastern Gulf Coast... ...Higher elevations snow are likely over the Wyoming Tetons... A slow-moving upper trough sliding along the Western/Central Gulf Coast will continue to be a heavy rainfall producer as it intercepts a moisture laden air mass. While the associated surface cyclone should slowly weaken in time, the slow nature of this system combined with anomalous moisture content will provide heavy rains and a threat for flash flooding to the Central/Eastern Gulf Coast region. The current WPC precipitation forecast suggests 3 to 5 inches are likely across lower Alabama into the western Florida panhandle through Wednesday morning. By Tuesday and Wednesday, the rainfall threat will migrate northward with the surface low spreading moderate to heavy rains to areas of the Ohio/Tennessee Valleys and along the favored upslope terrain of the Southern Appalachians. A myriad of smaller-scale features tracking within the active Pacific flow will focus an area of precipitation from the Upper Intermountain West into the Northern Plains. The boundary should initially be nearly stationary in nature before sinking south as a cold front once the upper trough begins to amplify and deepen across the Rockies. Temperatures should be cold enough across the highest elevations of the Wyoming Tetons and adjacent mountain ranges to produce minor snowfall accumulations. The WPC snowfall forecast suggests 4 to 8 inches during the next 48 hours across the Tetons. Given a lack of arctic air entering the picture, temperatures should generally be at or above normal across a majority of the continental United States. The only exceptions should be within the broad rainfall shield anchoring the Gulf Coast where limited sunshine will keep readings a bit lower than usual. Additionally, areas along the Eastern Seaboard which are under influence of a strong surface high will maintain readings around 5 to 10 degrees below climatology the next couple of days. Rubin-Oster Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php