Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 404 AM EDT Wed May 20 2020 Valid 12Z Wed May 20 2020 - 12Z Fri May 22 2020 ...There is high risk of excessive rainfall over the Southern Appalachians... ...There is an enhanced risk of severe thunderstorms over parts of the Northern/Central High Plains... ...Daily episodes of severe weather to transpire in the High Plains, Critical fire weather conditions linger across portions of the Southwest and Four Corners Region... An upper-level low producing heavy rain over the Ohio Valley and Southern Mid-Atlantic with bands of heavy showers and thunderstorms. The storm's seemingly endless supply of moisture and slow movement is a recipe for flooding concerns in these regions through Friday. High Risks for excessive rainfall is forecast for the Southern Appalachians through Thursday morning. Severe widespread flash flooding is expected in areas that do not normally experience flash flooding. Lives and property are in great danger. By Thursday evening, rainfall amounts could exceed seven inches in parts of the southern Appalachians. In addition, high pressure over the Northeast will produced strong wind over the parts of the Mid-Atlantic into the Ohio Valley with wind of 15 to 25 mph with gust up to 50 mph on Wednesday. There is an enhanced risk of severe thunderstorms over parts of the Northern/Central High Plains. A cold front should trigger strong-to-severe storms over the region. Meanwhile, a slow progressing frontal boundary will be the catalyst for thunderstorms up and down the High Plains Wednesday, and again on Thursday. The front's slow nature could also lead to flash flooding concerns in the Northern and Central High Plains. To the south, dry and windy conditions will prevail across the Southwest, promoting elevated to critical fire weather conditions across much of the Southwest through the Four Corners region through Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php