Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Sun May 03 2020 Valid 00Z Mon May 04 2020 - 00Z Wed May 06 2020 ...Showers and thunderstorms from the Middle Mississippi Valley to the Mid-Atlantic coast this evening, scattered showers and storms also possible in the Rockies and Plains... ...A pair of storm systems to make for a wet and stormy Monday in the Plains and Mississippi Valley Monday, additional storms possible across the South on Tuesday... ...Amplifying jet stream pattern to make for increasingly hot conditions in the Southwest and much cooler temperatures in the East... This evening, a frontal boundary stretching from the Northeast to the Southern Plains will spark additional showers and thunderstorms. Some storms could be severe and produce heavy rainfall. Slight risks for severe weather and excessive rainfall have been issued for the Ohio Valley but the threat for severe storms extends as far west as the middle Mississippi Valley. Showers and thunderstorms will dot the Rockies and northern High Plains where some storms could also become severe. The bulk of the precipitation across the Lower 48 the first half of the week will come at the hands of two storm systems in the Plains. One area of low pressure will generate scattered showers and thunderstorms across the Midwest on Monday. To the south, a more potent area of low pressure will be the catalyst for yet another round of severe weather from West Texas and the Mid-South to the southern Appalachians on Monday. The northern most feature will fizzle out on Tuesday with remnant showers possible in the Midwest and Ohio Valley, while the southern wave has the best chance to produce a broad area of potential thunderstorms from the Rio Grande River to the Carolina coast. The weather pattern through the period can be summarized by the start of an increasingly amplified jet stream pattern over North America that will continue into next weekend. Starting out west, an intensifying upper level ridge over the Southwest means the return of sizzling temperatures to the region. Temperatures in the Desert Southwest will surpass the century mark by Tuesday and continue into Wednesday with the potential for record warmth. Much of California and the Great Basin will also bask in increasingly warmer temperatures through Tuesday. In the East, a deepening trough in the jet stream pattern will usher in a Canadian air-mass that will force temperatures to plummet from the Midwest to the Northeast. The Southeast will see the summer-like temperatures stick around through Tuesday but cooler temperatures should arrive mid-week. Mullinax Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php