Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 351 PM EDT Sat Aug 29 2020 Valid 00Z Sun Aug 30 2020 - 00Z Tue Sep 01 2020 ...Showers and storms continue across the East Coast through this evening due to moisture from former Laura... ...Severe weather and flash flooding are expected for portions of the Plains and Mississippi to Tennessee Valleys through Monday... ...Locally heavy rain could cause flash flooding in portions of the Southwest but fire danger continues in the Northwest... A cold front is forecast to move eastward across the Mid-Atlantic and Northeast through the evening. Along and ahead of the front, moisture from the remnants of Laura will continue to cause storms, some of which could be severe and cause heavy rain. These threats should diminish tonight as the front moves offshore. While the cold front should move progressively through the northeastern U.S., the trailing end of the front is forecast to stall over the Tennessee Valley and across Arkansas and Oklahoma over the next couple of days, providing a focus for rain and thunderstorms there. There is a Moderate Risk of flash flooding in place for portions of Arkansas and far eastern Oklahoma through tonight, where a few inches of rain could fall over soil that is already generally saturated from Laura moving across recently. Slight Risks of excessive rainfall are in place for Sunday and Monday across parts of the Mississippi and Tennessee Valleys. Marginal to Slight Risks of severe weather are also in place there. South of the front, Heat Advisories and Excessive Heat Warnings are in effect for the Southern Plains and Lower Mississippi Valley, where temperatures will exceed 100 degrees. Meanwhile farther north, another potent frontal boundary moving across the Northern/Central Plains into the Midwest could also cause severe weather and flash flooding on Sunday, as well as much cooler temperatures behind it. Farther west, monsoonal moisture finally comes into the Southwest and could cause locally heavy rainfall and the possibility of flash flooding this evening and early next week. However, very dry weather in the northwestern U.S. will contribute to Elevated to Critical Risks of fire weather in eastern Washington/Oregon into the Great Basin and Northern Rockies. Red Flag Warnings are widespread throughout the region. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php