Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 AM EDT Tue Jul 23 2019 Valid 12Z Tue Jul 23 2019 - 12Z Thu Jul 25 2019 ...There is a slight risk of severe thunderstorms over parts of the Southern Mid-Atlantic... ...There is a slight risk of excessive rainfall over parts of the Central Gulf Coast, Southeast, and Southern Mid-Atlantic... A strong cold front will move off most of the East Coast and the Gulf Coast bringing to an end the recent heat wave in the East and Mid West. Showers and thunderstorms will develop along the boundary from the Southern Mid-Atlantic to the Central Gulf Coast and into parts of the Western Gulf Coast. Rain will develop along the northern portion of the front from the Southern mid-Atlantic northward to parts of New England that will move off the coast by Tuesday evening. Heavy rain associated with showers and thunderstorms will lead to areas of flash flooding (excessive rainfall) over parts of the Southern Mid-Atlantic to parts of the Central Gulf Coast. Temperatures and the humidity will drop in its wake with a much cooler/drier air mass for Tuesday--most areas will see below normal readings for late July in the 70s and lower 80s behind the front. Showers and thunderstorms will linger over parts of Northern Florida into the Florida Peninsula through Thursday morning. Additionally, in the wake of the front and associated upper-level trough, instability showers will develop due to daytime heating and cool air aloft over parts of the Great Lakes and the Upper Mississippi Valley on Tuesday and Wednesday with parts of the Lower Great Lakes and Ohio Valley added on Wednesday. Monsoonal moisture will move into parts of the Southwest/Great Basin and the Southern/Central Rockies on Tuesday and Wednesday. With the aid of daytime heating, showers and thunderstorms will develop over the region with maximum areal coverage during the late afternoon into the late evening on Tuesday and Wednesday. In addition, upper-level energy will move into the Pacific Northwest that will produce showers and thunderstorms over parts of the Northern Intermountain Region and Northern Rockies and rain over parts of the Northwest on Tuesday, ending by Wednesday evening. The energy will aid in developing a front over parts of the Northern Rockies overnight Tuesday into Wednesday morning. By Wednesday evening, showers and thunderstorms will develop over parts of the Northern/Central High Plains moving into parts of the Northern Plains by Thursday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php