Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 303 AM EDT Sun Apr 30 2017 Valid 12Z Sun Apr 30 2017 - 12Z Tue May 02 2017 ...Severe thunderstorm and flash flooding threats will continue across portions of the Mississippi and Ohio valleys... ...Heavy snow and gusty winds expected for portions of the High Plains... An intensifying low pressure system across the central U.S. will bring a range of weather hazards to the central and eastern U.S. today and Monday. As the surface low moves from the central plains toward the upper Mississippi valley today, numerous showers and thunderstorms are expected, from the lower Mississippi valley to the Great Lakes. Severe thunderstorms and flash flooding will both be possible across these areas. Please refer to products issued by the Storm Prediction Center for further details on the severe weather threat. On Monday, as the cold front moves east, showers and thunderstorms are expected to spread across much of the eastern U.S., including the major East Coast cities by Monday afternoon and evening. On the western side of the low pressure system, cold air in place will allow precipitation to fall as snow today from the central High Plains to portions of Midwest, and continuing across portions of the Upper Midwest into Monday. Heavy snow is possible today across the central High Plains. Additionally, gusty winds accompanying the snowfall may lead to blizzard conditions for some areas. Elsewhere, a Pacific cold front will bring scattered rain and mountain snow showers from the Northwest to the northern Rockies today into early Monday. Temperatures across the nation will be well below average across the central U.S. in the areas being affected by the winter storm. Above average temperatures are expected once again today across much of the eastern U.S., where high temperatures may reach 10 to 20 degrees above average. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php