Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 333 AM EDT Sun Apr 08 2018 Valid 12Z Sun Apr 08 2018 - 12Z Tue Apr 10 2018 ...Accumulating snowfall possible from the northern Plains into the middle and upper Mississippi Valley Sunday and Sunday night... ...Well below normal temperatures and record lows possible across portions of the northern Plains and the Mississippi Valley on Sunday... Precipitation across the Western U.S. and the Rockies should begin to wane on Sunday as the upper level system moves inland and high pressure builds at the surface. Up to an additional foot of snow may still be possible in the highest elevations of the Washington Cascades as well as the northern Rockies. As the surface low associated with this system shifts eastward today, snowfall will develop on the north side of the low from the northern Plains and into portions of the upper and middle Mississippi Valley. Winter weather advisories are in effect from northeast Montana into northern Iowa where up to half a foot of snow is forecast. A frontal boundary draped across the Gulf of Mexico will begin slowly drifting northward by overnight Sunday and into Monday. As a result, widely scattered showers and thunderstorms can be expected along the Gulf Coast and into the Southeastern states the next few days. Organized moderate to locally heavy rainfall with embedded thunderstorms may be possible across portions of northern Florida and the Carolina coasts as a surface low drifts across the Sunshine State and out into the western Atlantic late Monday and into Tuesday. Temperature wise, upper level troughing will support relatively chilly temperatures, at least for early April standards, across much of the country east of the Rockies. Temperatures from the northern Plains into the Mississippi Valley may be as much as 20 to 30 degrees below normal, with record lows possible. Meanwhile, warmer than average temps across the Southwest on Sunday will spread up the West Coast by Monday as upper level ridging builds. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php