Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 AM EDT Sun Jul 21 2019 Valid 12Z Sun Jul 21 2019 - 12Z Tue Jul 23 2019 ...Dangerous heat wave will continue through Sunday in the East... ...There is a slight risk of severe thunderstorms over parts of the Middle Mississippi Valley and Central Plains... ...There is a slight risk of excessive rainfall over parts of the Ohio/Tennessee Valleys, Middle Mississippi Valley, Central Plains, and Central/Southern High Plains... ...Temperatures will be 10 to 20 degrees below average over parts of the Northern/Central Plains... Oppressive and dangerous heat wave gripping much of the Midwest to Eastern U.S. will give way after front passes on Monday and Tuesday. In the meantime, Excessive Heat Warning and Heat Advisory extend from parts of the Central/Southern Plains eastward to the Ohio Valley with a second area from parts of New England southward to the Southern Mid-Atlantic. On Sunday, the greatest heat threat will be from the Carolinas to Maine where daytime highs in the mid to upper 90s combined with high dewpoints will make it feel like its near 100 to 110 for many. Even overnight will provide little relief as temperatures struggle to get below the upper 70s or even low 80s. This may challenge or break daily record high minimums for a large number of stations across the Ohio Valley/Northeast and Mid-Atlantic. Please see www.weather.gov for the latest on the coverage of warnings, and also tips on how to stay safe in this heat. A front extending from the Lower Great Lakes roughly westward to the Central High Plains will move southward to Northern Mid-Atlantic southwestward to Central Texas Monday evening. The front will bring an end to the heat wave over the eastern two thirds of the country by Monday evening. Showers and thunderstorms and cooler temperatures will accompany the boundary over the Central Plains and Midwest on Sunday. Some storms could be severe across Middle Mississippi Valley and Central Plains. Locally heavy rainfall could lead to flash flooding as well in these regions. The front should progress slowly south and eastward, reaching the East Coast by Monday. Showers and thunderstorms will accompany this boundary, with heavy rainfall possible across parts of the Tennessee/Ohio Valleys and into the Central Appalachians. WPC highlights this region within a slight risk for flash flooding. Behind the front temperatures will be 10 to 20 degrees below average over parts of the Northern/Central Plains. Elsewhere, expect typical diurnal showers and storms across the Southeast on Sunday and Monday. On Monday evening monsoonal moisture will move into parts of the Southwest combine with daytime heating will produce showers and thunderstorms over parts of the region during the late afternoon into the late evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php