Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Sat Aug 08 2020 Valid 00Z Sun Aug 09 2020 - 00Z Tue Aug 11 2020 ...Rounds of thunderstorms across portions of the Heartland could become severe and pose a threat for flash flooding... ...Additional thunderstorm activity likely from the Upper Midwest on Sunday to the Great Lakes and Central Plains on Monday... ...Hot conditions persist across much of the Lower 48, fire weather risk continues in portions of the Rockies and Great Basin... The most active weather nationally through the remainder of the weekend is expected to transpire in the central Plains and Midwest. A frontal boundary draped across the North Central U.S. will be the focal point for showers and thunderstorms this evening. The Storm Prediction Center issued an enhanced risk this afternoon over central Nebraska and southeast South Dakota while a marginal risk extends from the Black Hills to the shores of Lake Michigan. In addition, heavy rainfall likely sets up in the Middle Mississippi Valley this evening with excessive rainfall rates possible. A slight risk for flash flooding has been issued in eastern Missouri and southwest Illinois through early Sunday morning. By Sunday, a cold front racing through the northern High Plains looks to trigger more strong-to-severe storms both along the cold front in the Great Plains and within the warm sector over the Upper Mississippi Valley. This cold front continues tracking east on Monday pushing the area of showers and thunderstorms into the Great Lakes, Ohio Valley, and Central Plains. To the east, pulse thunderstorms will be a daily occurrence from the Mid-Atlantic on south the Gulf Coast. Temperature-wise, the "Dog Days of Summer" continue as above normal temperatures persist from California on east across the Southern Plains and east of the Mississippi River. Sunday high temps in the 90s are widespread from the Desert Southwest to the Mid-Atlantic coast. The coolest temperature anomalies on Sunday set up across the northern Rockies and High Plains. By Monday, the cold front passing through the northern Plains ushers in cooler temperatures to the region while conditions become hotter across the Great Lakes and Northeast. Lastly, the combination of low relative humidities and windy conditions allow for favorable wild fire conditions in parts of the central Rockies and the Snake River Plain. Mullinax Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php