Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 403 PM EDT Thu Apr 28 2016 Valid 00Z Fri Apr 29 2016 - 00Z Sun May 01 2016 ...There are slight risks of severe thunderstorms over parts of the Southern Plains and over parts of the Southern Mid-Atlantic... ...Heavy rain possible over parts of the Southern Plains, Lower/Middle Mississippi Valley and western Tennessee Valley... ...Snow over parts of the Central Rockies... Showers and thunderstorms are generating along and ahead of a low pressure system moving through the Mississippi, Ohio and Tennessee Valleys this afternoon. Some of the storms tracking through the Mid-Atlantic region could potentially turn severe. The Storm Prediction Center has issued a slight risk for portions of West Virginia, Virginia and North Carolina. Several storms has developed along the central Gulf Coast and across the Southeast; however the threat for turning severe is marginal. The system will continue to advance eastward through Friday afternoon. Scattered showers and thunderstorms continue along the Appalachians through Friday evening with most coastal areas having cleared out. Heavy rain and flash flooding is also a concern with some of the storms that are tracking through the Mid-Atlantic. Excessive rainfall outlooks have been issued for portions of eastern Kentucky, most of West Virginia and northeast North Carolina. The threat is expected to weaken or diminish by early Friday morning. A second storm will push through the Four Corners region this evening and cross the southern Rockies on Friday. Scattered showers and a few thunderstorms have developed over the Desert Southwest, Great Basin and portions of the southern/central Rockies today. Rain and higher elevation snow across portions of the West and Great Plains will continue into the weekend. Snow accumulations of 1 to 2 feet may be possible for the highest elevations of the Colorado Rockies by Sunday evening. Snow will decrease intensity through the day on Saturday as the system pushes further into the Southern Plains. Strong to severe thunderstorms will likely develop across portions of Oklahoma, Texas, western Arkansas and northern Louisiana on Friday. The Storm Prediction Center has issued a slight risk for portions of the Southern Plains through early Saturday morning. Heavy rainfall will likely accompany the convection on Friday and Saturday therefore an excessive rainfall outlook has been issued for nearly the same region. The area of increased risk will shift to the east on Saturday, spanning from the western Gulf Coast to the Middle Mississippi Valley. In addition by Friday morning, a third system will move onshore over Pacific Northwest moving to parts of the Great Basin/Central California by Friday evening. Rain will begin over parts of the Pacific Northwest on Friday morning that will extend from the Northwest to parts of the Rockies and the Southwest by Friday evening. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php