Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 421 AM EDT Mon Aug 19 2019 Valid 12Z Mon Aug 19 2019 - 12Z Wed Aug 21 2019 ...Scattered showers and thunderstorms are forecast across the eastern half of the United States... ...Heavy rainfall continues along the Gulf Coast, with flash flooding possible... ...Widespread and in some areas record-setting heat persists across much of the country... ...Elevated fire weather conditions are expected in the West, particularly Wyoming... On Monday, showers and thunderstorms are forecast ahead of a slow-moving frontal boundary from the Ohio Valley into the Lower Great Lakes region, Mid-Atlantic, and Northeast. Locally heavy rainfall and isolated flash flooding is possible with these storms, and some severe weather cannot be ruled out either. Scattered thunderstorms are also possible by Monday evening in the Northern Plains as a low pressure system drops south. Severe weather is expected just ahead of the fronts associated with this low as they move southward into the Central Plains and Middle Mississippi Valley Tuesday. A Slight Risk of severe weather is currently in place for those regions for Tuesday. A surface low pressure system will meander in the Southeast over the next couple of days, with Gulf moisture streaming into the region. Thus heavy rainfall is once again possible for the Central and Eastern Gulf Coast. A Slight Risk of excessive rainfall/flash flooding is in place today across portions of Florida, Georgia, and southeastern Louisiana, with scattered showers and thunderstorms extending into the Tennessee Valley and Carolinas. Very hot weather will once again be a threat across most of the continental U.S. for the first part of the workweek. Record-setting high temperatures are possible in the Southern/Central High Plains and into the Mid-Atlantic and Northeast, with the Southwest also flirting with record highs on Tuesday. Excessive Heat Warnings and Heat Advisories are in place for portions of the country where heat indices will be dangerous. Meanwhile, below average temperatures are expected in the Northern Plains behind another cold front on Tuesday. Low humidities and gusty winds are expected to combine once again in the West, creating elevated fire weather conditions. Red Flag Warnings are in effect for much of Wyoming. Despite it being typical monsoon season, it has been dry lately, but isolated showers and storms may form particularly for the Rockies and High Plains by Tuesday evening. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php