Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 312 PM EDT Wed Aug 12 2020 Valid 00Z Thu Aug 13 2020 - 00Z Sat Aug 15 2020 ...A Slight to Moderate Risk of excessive rainfall exists in the Mid-Atlantic through Thursday... ...A Slight Risk of excessive rainfall and severe thunderstorms exists over the Northern Plains through Friday... ...Elevated fire weather conditions & Excessive Heat Warnings are in effect over portions of the Western U.S through Thursday... ...Record heat from the Southern Plains into the Southwest possible through Friday... A front will become quasi-stationary over the Northeast/Mid-Atlantic into the Ohio Valley into Thursday, before sagging southward late Thursday into Friday as high pressure builds southward from eastern Canada. High moisture will pool along the front, which when lit by daytime heating sparks showers and thunderstorms near and south of the boundary with potentially heavy rainfall. A Moderate Risk of excessive rainfall exists over the Mid-Atlantic from Wednesday afternoon into Thursday morning due to recent and expected heavy rainfall, with a Slight Risk existing in and near Virginia Thursday and Thursday night. A slowly moving cold front is expected to produce windy conditions, but little precipitation, which will factor into elevated to critical fire weather conditions Wednesday and Thursday across portions of the Northwest, Northern Rockies and Great Basin. Red Flag Warnings are in effect for many of these areas. Meanwhile, potentially record heat spreads westward from the Southern Plains through the Southwest into California. Excessive Heat Watches and Warnings have been posted for portions of California and the Southwest. High temperatures above 105 degrees should be commonplace, with Death Valley itself likely to reach the mid 120s; record highs are possible across these areas. Moisture in advance of the slowly progressive Western front moving into the Northern Plains will aid in producing showers and thunderstorms with heavy rainfall across the Northern Plains and eventually the Upper Mississippi; a Slight Risk of excessive rainfall/flash flooding and severe thunderstorms exists through Friday. Roth Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php