Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 345 AM EDT Mon Apr 22 2019 Valid 12Z Mon Apr 22 2019 - 12Z Wed Apr 24 2019 ...Severe thunderstorms and locally heavy to excessive rainfall possible Monday into Tuesday for parts of the Southern Plains... ...Snowmelt combined with rainfall could lead to flooding across parts of the Upper Midwest and also Maine... ...The Western U.S. should stay mostly dry and very warm through the short range... A frontal system moving slowly south and eastward through the middle part of the country today will continue to allow for scattered showers along the boundary from the Upper Midwest to the Southern Plains. Strong to severe thunderstorms could be a threat Monday into Tuesday across parts of Texas, where the Storm Prediction Center has highlighted a slight risk. Storms could also contain heavy rainfall with locally excessive rains/flash flooding possible. Along the boundary to the northeast, enhanced rainfall will continue into Monday across parts of Wisconsin and the Upper Peninsula of Michigan, where present snow cover coupled with modest rainfall could lead to flooding. Flood watches remain in effect across this region. This front will usher in a much cooler airmass by today from the Upper Mississippi Valley to the High Plains, with locally heavy mountain snows continuing across parts of the Colorado Rockies. The cold air sinks south and eastward by Tuesday, with the greatest departures (as much as 20 degrees below normal) expected across parts of the Southern/Central Plains. Ahead of the front, temperatures will be warm and above normal from the Midwest to the East, with daytime highs running about 10 to 15 degrees above normal. Elsewhere, a developing surface low off the Atlantic coast will lift northward on Monday resulting in scattered rain showers along the Mid-Atlantic coast and into parts of the the Northeast. Though amounts should generally be light, any additional rainfall could exacerbate ongoing flooding across parts of Maine due to snowmelt. Out west, a weak front entering the Pacific Northwest may spark light and scattered rain for parts of the Northwest and Northern Rockies, but otherwise weather across the remainder of the West will be dry and very warm (10 to 20 degrees above normal) as a strong ridge of high pressure builds and expands across the region. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php