Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 328 PM EDT Thu Mar 21 2019 Valid 00Z Fri Mar 22 2019 - 00Z Sun Mar 24 2019 ...A developing coastal storm to bring rain, interior and higher elevation snows, and gusty winds to parts of the Mid-Atlantic and Northeast... ...A couple rounds of rain and mountain snows likely across parts of the West during the short range, with rain moving into the Southern and Central Plains by Friday... ...Major to historic river flooding will continue across parts of the Mississippi and Missouri River Basins with areal flooding a threat across parts of the Northwest and Northern Plains as well... The main sensible weather threat in the short range with be a developing coastal low pressure system over southeast Virginia this evening, tracking up the East Coast through tonight and into Friday. Moderate to locally heavy rainfall will accompany this system across the Mid-Atlantic and Northeast with flash flooding a marginal and local threat particularly for highly urbanized areas. A handful of flood watches are in effect across parts of the Mid-Atlantic. Accumulating snowfall is likely well inland across portions of the interior Northeast, where winter storm warnings have been issued. Gusty winds are also likely across the Mid-Atlantic and Northeast into the weekend as the storm deepens as it moves up the coast. Meanwhile, a cold front moving across the Four Corners region this evening will continue to produce rain and mountain snows across parts of the Southwest and into the Southern Rockies through Friday. As moisture get drawn northward from the Pacific ahead of the cold front, precipitation is expected to spread into parts of the southern and central Plains on Friday and Saturday. Another cold front entering the West Coast states by late Friday will bring more rain and higher elevation snows to California, the Pacific Northwest, and parts of the interior West this weekend. Major to historic and catastrophic flooding across parts of the Missouri and Mississippi River Basins will continue through the short range due to ongoing effects following a period of rapid snow melt after heavy rainfall last week. Flood warnings and advisories remain for parts of the region. By Saturday, light rain will be possible across areas seeing the highest impacts, which will only exacerbate ongoing flooding. Areal flooding is also a concern across parts of the Northwest and into the Northern Plains as warmer temperatures the end of this week lead to accelerated snowmelt and the potential for ice jams. Snell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php