Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 PM EDT Mon Apr 06 2020 Valid 00Z Tue Apr 07 2020 - 00Z Thu Apr 09 2020 ...Precipitation and cooler weather continues for California into the Southwest over the next couple of days, with heavy rain causing flash flooding potential... ...Severe weather expected for the Ohio Valley to Mid-Atlantic Tuesday and for the Tennessee Valley Wednesday... ...Warmth continues for much of the country through midweek... An anomalously deep upper-level low is forecast to meander in the eastern Pacific offshore of California, eventually making its way into the Southwest late Wednesday. This and plenty of available moisture will continue to cause precipitation over much of California and into the Southwest and Great Basin. With persistent heavy rain expected in southern parts of California, flooding and flash flooding are possible, especially over burn scars but in urbanized areas as well. Slight Risks of excessive rainfall are in place over the next few days to outline this threat. Additionally, snow is forecast to continue especially over southern portions of the Sierra Nevada as well as the San Bernadino and San Gabriel Mountains. Farther east, showers and thunderstorms are possible in the eastern half of the nation through Wednesday. Storms are expected to focus near and south of a warm front located in the Ohio Valley to Mid-Atlantic today, pushing northward toward the Great Lakes on Tuesday. The Storm Prediction Center has outlined a large Slight Risk area for potential severe weather on Tuesday for much of the Ohio Valley into the Appalachians and Mid-Atlantic, after Marginal Risks today. Some localized high rainfall totals could cause flash flooding concerns there as well. Then, ahead of an approaching cold front, severe weather could be a hazard for the Tennessee Valley and Lower Ohio Valley on Wednesday. Elsewhere, there is an Elevated to Critical fire weather threat over the Southern/Central High Plains through Tuesday, where downslope winds and low humidities will combine. Temperatures are forecast to remain quite warm from the Rockies eastward again on Tuesday. High temperatures of 15 to 20 degrees above normal are likely from the Central Plains to the Midwest, with highs near 80 degrees. The Northern Plains is expected to cool down by Wednesday as a cold front moves through, and the Northeast will cool down Wednesday as well, but much of the rest of the nation will stay warm. Highs in the upper 80s on Wednesday could be close to records across the Lower Mississippi Valley and Gulf Coast. Meanwhile, the low upper-level heights should keep temperatures cool for the southern half of California into portions of the Southwest through the period; highs 15 to 25 degrees below average are expected there. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php