Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 601 AM EDT Wed Aug 12 2020 Valid 12Z Wed Aug 12 2020 - 12Z Fri Aug 14 2020 ...There is a Moderate Risk of excessive rainfall over the Mid-Atlantic... ...There is a Slight Risk of severe thunderstorms over parts of the Northern/Central Plains... ...Elevated fire weather conditions and Excessive Heat Warnings are in effect over portions of the Western U.S... A front will become quasi-stationary over the Northeast/Mid-Atlantic into the Ohio Valley through Friday. Tropical moisture will pool along the front aiding in producing showers and thunderstorms. Showers and thunderstorms will develop from parts of Southern New England/Mid-Atlantic into parts of the Ohio Valley through Friday. The WPC has issued a Moderate Risk of excessive rainfall over the Mid-Atlantic through Thursday morning. Heavy rain associated with the thunderstorms will aid in producing numerous flash flooding events with significant events possible. In addition, another front moving into the Upper Midwest will aid in producing showers and thunderstorms. The SPC has issued a Slight Risk of severe thunderstorms over parts of the Northern/Central Plains in two separate areas. The hazards associated with the severe thunderstorms are frequent lightning, severe thunderstorm wind gust, and hail over the area through Thursday morning. 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, and areas around northwest Nevada on Thursday. Red Flag Warnings are in effect for many of these areas. And with very little monsoon moisture to speak of, daytime temperatures remain well above 100 degrees in the Southwest and California. An Excessive Heat Watch has been posted for a good portion of the Central Valley and coastal southern California. An Excessive Heat Warning was issued for the desert portions of California and areas in southern Arizona starting Wednesday. High temperatures here may commonly reach 110 to 120 degrees this week, with Death Valley itself likely to reach the mid 120s. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php