Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 404 PM EDT Tue Jun 18 2019 Valid 00Z Wed Jun 19 2019 - 00Z Fri Jun 21 2019 ...Enhanced Risk of severe weather for the Southern/Central Plains through Tuesday night with flash flooding possible as well... ...Thunderstorms containing flash flooding and severe weather are possible more broadly from the Rockies to Eastern Seaboard... ...In the West, fire weather conditions expected in the Columbia Basin and then snow in higher elevations of the Cascades and Northern Rockies... A couple of frontal systems across the central and eastern U.S. should move gradually eastward over the next couple of days ahead of some upper-level energy. Abundant moisture streaming in will lead to scattered thunderstorms across much of the U.S., from the Rockies to the Eastern Seaboard. Through Tuesday night, the best chance for severe thunderstorms will be in the Central and Southern Plains, where an Enhanced Risk of severe weather is in place from the Storm Prediction Center. Heavy rainfall causing flash flooding is also possible there. Additionally, a Slight Risk of excessive rainfall is in place from the Southern Appalachians to parts of the Mid-Atlantic where heavy rain could occur, and Flood and Flash Flood Watches are in effect for some of these areas. A Slight Risk of severe weather is also outlooked for portions of the Mid-Atlantic region. On Wednesday, the potential for widespread thunderstorms, some of which could create severe weather and flash flooding, moves eastward with the front. A Slight Risk of excessive rainfall/flash flooding is in place for parts of the Middle Mississippi Valley and much of the Ohio Valley on Wednesday and Wednesday night. The greatest risk for severe weather will be mainly farther south, from the Southern Plains to the Lower Mississippi and Tennessee Valleys but into the Ohio Valley as well, where there is a Slight Risk of severe weather in place. By Thursday, widespread rain and thunderstorms are expected for the Central Appalachians, northern Mid-Atlantic, and parts of the Northeast. A deep upper-level low is expected to move southeastward from Canada into the northwestern U.S. on Wednesday and Thursday. As the low approaches, increasing winds and dry soil will lead to favorable fire weather conditions in interior Washington and Oregon (Columbia Basin), where there is a Critical Risk of fire weather from the Storm Prediction Center Wednesday after an elevated risk Tuesday. Farther east, thunderstorms are possible with a frontal system across the Northern/Central Rockies to Northern Plains. The upper low will bring in colder than average temperatures for the Northwest, which could lead to a dusting to a few inches of snow in higher elevations of the Cascades and Northern Rockies by Wednesday and Thursday. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php