Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 416 AM EDT Thu Jun 20 2019 Valid 12Z Thu Jun 20 2019 - 12Z Sat Jun 22 2019 ...There is a slight risk of severe thunderstorms over parts of the Middle Mississippi Valley/Central Plain and the Central High Plains... ...There is a slight risk of severe thunderstorms over parts of the Mid-Atlantic/Southeast with an embedded enhance risk over parts of the Southern Mid-Atlantic... ...There is a slight risk of excessive rainfall over parts of the Northeast into the Ohio Valley/Central Appalachians and parts of the Northern Plains... ...Snow possible over parts of the Northern Rockies/Cascades... Low pressure over the Ohio Valley will slowly move eastward off the Northeast Coast by Friday evening. The system will produce showers and thunderstorms over parts of the Northeast to the Great Lakes southward to the Central Gulf coast to the Southeast that will slowly move off most of the East Coast by Friday morning into Friday afternoon. Rain will linger over parts of the Northeast through Friday evening. Upper-level energy over the Northern Plains will move eastward into the Upper Great Lakes by late Thursday night. The energy will produce rain and showers/thunderstorms over parts of the Northern Plains, on Thursday morning, that will slowly move into parts of the Upper Mississippi Valley by Thursday evening, slowly dissipating overnight Thursday. Meanwhile, an upper-level low over Southwestern Canada will move southward over the Northern Rockies/Northern High Plains by Friday and expanding into the Great Basin by Saturday. The energy will produce rain and highest elevation snow over parts of the Pacific Northwest and the Cascades into parts of the Northern Intermountain Region continuing through Friday afternoon. Rain and highest elevation snow and daytime thunderstorms will develop over parts of the Northern/Central Rockies through late Friday night. Upper-level dynamics assocated with the upper-level low will aid in producing rain and showers/thunderstorms over parts of the Northern/Central Plains overnight Thursday that will expand into parts of the Middle/Lower Mississippi Valley by Friday morning. The showers and thunderstorms will continue to expand into parts of the Western Ohio and Tennessee Valleys by Friday evening continuing into Saturday. Furthernmore, showers and thunderstorms will develop a long and ahead of a dryline over the Southern Plains on Friday evening into early Saturday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php