Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 AM EDT Mon Jun 21 2021 Valid 12Z Mon Jun 21 2021 - 12Z Wed Jun 23 2021 ...There is a Slight Risk of excessive rainfall over parts of the Central Appalachians/Ohio Valley to the Lower Mississippi Valley and parts of the Western to Eastern Gulf coast through Tuesday morning... ...There is a Slight Risk of severe thunderstorms over parts of the Northeast/northern Mid-Atlantic and parts of the Ohio Valley/Central Appalachians through Tuesday morning... ...Dangerous and record-breaking heat wanes across California and the Southwest, while expanding into the Pacific Northwest on Monday... A front extends from the Great Lakes roughly southwestward to the Southern High Plains, moves eastward off the Northeast Coast by Tuesday evening and off the Southeast Coast by Wednesday morning. Moisture will be pooling along the boundary and showers and thunderstorms as the front moves eastward through Wednesday. The WPC has issued a Slight Risk of excessive rainfall with these thunderstorms. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams are the most vulnerable through Tuesday morning. Similarly, upper-level energy will be over the Gulf Coast with tropical moisture in place, showers and thunderstorms will develop over the region. The WPC has issued a Slight Risk of excessive rainfall with these thunderstorms. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams are the most vulnerable through Tuesday morning. Furthermore, the front will produce showers and thunderstorms over the Northeast. The SPC has issued a Slight Risk of severe thunderstorms over parts of the Northeast/northern Mid-Atlantic and parts of the Ohio Valley/Central Appalachians through Tuesday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. The severe thunderstorm threat weakens a bit on Tuesday along the Mid-Atlantic and Southeast. The excessive rainfall threat weakens, too. However, there will be a Slight Risk of excessive rainfall over parts of the Southeast and Southern Appalachians on Tuesday into Wednesday morning. Tropical Depression Claudette is forecast to move eastward off the North Carolina Coast on Monday, redevelops into a Tropical Storm. Claudette will then move northeastward out over the Western Atlantic off the Northeast Coast towards the Canadian Maritimes by Wednesday. Check the latest advisory from the National Hurricane Center for the most up-to-date track and intensity of Claudette. Claudette will produce heavy rain over parts of the Southeast/Mid-Atlantic until the storm moves off the coast on Monday. Elsewhere, the high heat over most of the western U.S. will end as the temperature becomes more average. However, there is a potential for record-breaking high minimum temperatures across the Northwest on Monday. The combination of heat and exceptional drought is also leading fire weather concerns throughout the Great Basin and parts of the Southwest through Wednesday. Red Flag Warnings are in effect across parts of Utah, western Colorado, and northwestern Nevada. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php