Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 PM EDT Sun Jul 19 2020 Valid 00Z Mon Jul 20 2020 - 00Z Wed Jul 22 2020 ...Very hot and humid conditions will continue in the East on Monday... ...Severe weather and flash flooding are possible in central and eastern parts of the country along a slow-moving front... Hot temperatures combined with high dewpoints are currently causing dangerous heat across the central and eastern U.S. Heat Advisories stretch from the Southern Plains across the Middle Mississippi and Ohio Valleys to the Eastern Seaboard, with Excessive Heat Warnings in effect for the Philadelphia region, parts of the Delmarva peninsula, and far southeastern Virginia/northeastern North Carolina. Temperatures in some areas continue to rise and could set record high temperatures today. Additionally, even the typically hot Phoenix area has an Excessive Heat Warning in effect today. Overnight, temperatures are forecast to stay warm in the East, compounding the heat danger, and widespread warm low temperatures should be set on Monday morning from the Appalachians eastward. A cold front passing through should help drop temperatures at least a few degrees in the Ohio Valley on Monday, but high heat indices will continue for the Eastern Seaboard. The Northeast should see relief from the heat on Tuesday, but the Mid-Atlantic remains hot. Warmer than average temperatures are also forecast for the Great Basin over the next couple days, while cooler temperatures will be present in the Northern/Central Plains to the Midwest. A cold front is expected to move across the Great Lakes region and Northeast over the next couple of days, providing a focus for thunderstorms. A Slight Risk of severe thunderstorms is in place for the Lower Great Lakes toward portions of the Ohio Valley through the evening, and locally heavy rainfall is possible as well. Farther west, the front will meander over the Plains, Mississippi Valley, and Ohio Valley into Tuesday. With the stalling front, rain and thunderstorms could cause flash flooding over the Central Plains and Middle Mississippi Valley through tonight with rainfall amounts possibly over 2 inches. A Slight Risk of flash flooding is also in place for the Southern High Plains today, while severe weather is more likely farther north over the Central High Plains. Then on Monday, a couple of areas could see rainfall amounts and rates capable of flash flooding: parts of the Northern Plains to Upper Mississippi Valley, and parts of the Central Plains to Middle Mississippi Valley. Severe weather appears most likely in the Northern Plains Monday. Rain and storms should spread up to the Midwest and Great Lakes on Tuesday as the warm front lifts north. Scattered showers and thunderstorms are also possible for Florida and the Gulf Coast through the period. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php