Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 422 PM EDT Sun Jun 21 2020 Valid 00Z Mon Jun 22 2020 - 00Z Wed Jun 24 2020 ...There is a moderate risk of severe thunderstorms over parts of the Central/Southern Plains... ...There is a slight risk of excessive rainfall over parts Middle Mississippi Valley and Central/Southern Plains... ...Temperatures will be 5 to 10 degrees above normal over parts of Northern California and the Lower Great Lakes to Northern New England... A front extending from the Great Lakes across the Middle Mississippi Valley/Central Plains to the Central High Plains will slowly move to the Lower Great Lakes southwestward to the Southern Plains by Tuesday evening. Moisture from the Western Gulf of Mexico will stream northward over the Plains and pooling along the boundary aiding in the development of showers and thunderstorms through Tuesday evening. The SPC has issued a moderate risk of severe thunderstorms over parts of the Central/Southern Plains with a slight risk extending from Upper/Middle Mississippi Valley and the Northern/Central Plains southward to the Southern Plains. The main hazards with these thunderstorms will be large hail over two inches, damaging thunderstorm wind, as high as 75 mph, wind-driven hail, and some tornado risk. The WPC has issued two areas of slight risk of excessive rainfall over parts Middle Mississippi Valley and Central/Southern Plains. One area will be over the Central Plains/Upper Mississippi Valley and a second over parts of the Central/Southern Plains. Heavy rain associated with the thunderstorms will produce areas of mainly localized scattered flash flooding through Monday morning. North of the primary front, the coolest temperatures are expected to persist across the North-Central United States. Out West, a building warm core high pressure system will lead to heat building into California and the Great Basin, which peaks on Monday in the Great Basin before a front settles into the region, leading to some relief. Record high temperatures will be possible in and near Northern California on Monday and Tuesday. Excessive heat watch is posted over the San Joaquin Valley. The building high will foster hot temperatures across the adjoining Southern Plains, with a risk of record highs near the Trans Pecos region of Texas on Monday. The most anomalous temperature departures from normal over the next few days are forecast for the Northeast, where highs at or above 90 degrees possible. Monday appears to be when record high temperature are most threatened, in and near Vermont. Meanwhile, unsettled weather is also expected toward the Eastern Seaboard, with scattered thunderstorms forecast. In addition, showers and thunderstorms will develop over parts of the Northern/Central High Plains on Sunday night into Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php