Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 347 AM EDT Sun Apr 14 2019 Valid 12Z Sun Apr 14 2019 - 12Z Tue Apr 16 2019 ...The threat for severe thunderstorms moves into eastern U.S. today... ...Possible flooding and flash flooding from the Appalachians into portions of the Northeast... ...Roller coaster ride of temperatures continues from the Plains to the East Coast... The spring storm system responsible for an outbreak of severe storms from eastern Texas through the Lower Mississippi Valley on Saturday will continue to move east today and tonight. The greatest threat today will be from the Upper Ohio Valley into the Central to Southern Appalachians where the Storm Prediction Center has an Enhanced Risk in place. A line of severe thunderstorms, ongoing from early Sunday morning, is expected to move into the Southeast through the remainder of the morning and early afternoon hours. Some fragmentation and possible weakening of this line is expected but a second round of storms is anticipated farther north into the Appalachians later this afternoon. Both the southern and northern locations of this storm system will see locally heavy rain from thunderstorms but the more susceptible terrain of the Appalachians and portions of New York will see a threat for flooding/flash flooding from one to perhaps as much as three inches of rain by Monday morning. On the north side of the system, temperatures should be cold enough to support light to moderate snow accumulations from northern Illinois into Lower Michigan during the day into the early part of tonight. The combination of warm temperatures, rain and lingering snow cover across portions of northern New England will generate a threat for flooding of rivers and streams through Tuesday morning. Behind the cold front, today's high temperature departures will be well below average from the Upper Great Lakes to the central and western Gulf Coast, roughly 10 to 20 degrees below typical mid-April average highs. This cool weather, though somewhat moderated, will reach east of the Mississippi River for Monday which will be in contrast to the above average temperatures in store for today. Across the Great Plains, a chilly start this morning will be followed by temperatures much closer to average for today's daytime highs, and well into the 80s for Monday from western Kansas into West Texas (10 to 15 degrees above average). Unsettled weather will continue through Monday for the western U.S. as a cold front moves inland during the day today. Rain and higher elevation snow will accompany this system with some moderate to locally heavy snowfall accumulations possible in the higher elevations of western Wyoming with as much as 1 to 2 feet through Monday. Yet another storm system will approach the West Coast on Monday, bringing a renewed round of rain and mountain snows to California, Oregon and the Great Basin for the second half of Monday into Tuesday. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php