Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 350 PM EDT Sat Sep 21 2019 Valid 00Z Sun Sep 22 2019 - 00Z Tue Sep 24 2019 ...There is a moderate risk of excessive rainfall over parts of the Lower Missouri Valley... ...There is a slight risk of severe thunderstorms over parts of the Upper Midwest and the Lower Mississippi Valley/Central Plains... ...Temperatures will be 15 to 20 degrees above average over parts of the Great Lakes into the Western Ohio/Middle Mississippi Valley... A strong front extending from the Upper Mississippi Valley southward to the Central Plains then southwestward to the Southern High Plains will move eastward to the Northeast/Northern Mid-Atlantic Coast roughly southwestward to the Tennessee Valley then into the Southern Plains by Monday evening. This boundary will produce showers and thunderstorms in the Upper Midwest and Central Plains/Middle Missouri Valley. Some of the storms could be severe, with frequent lightning, large hail, damaging winds, and a couple of tornadoes possible. The Storm Prediction Center has issued a Slight Risk for severe thunderstorms across Upper Midwest and Central Plains/Middle Missouri Valley. Flash flooding will also be possible, particularly across Northeast Kansas and Northern Missouri. A Moderate Risk of excessive rainfall has been issued for this region, where 2 to 4 inches of rain is possible producing numerous areas of flash flooding that will be likely over these parts. Colder air will continue to linger across the western states behind the cold front, with temperatures running 10 to 20 degrees below average for this time of year on Saturday. These cold temperatures will allow for snow to fall above 7000 feet across portions of Wyoming and Montana through Sunday morning. A Freeze Watch has been issued across portions of Wyoming. Temperatures will moderate slightly on Sunday across the Northwest, but will still remain below average. Ahead of the cold front, temperatures will run as much as 15 to 20 degrees above average across the Great Lakes and eastern U.S. through the weekend. This equates to widespread high temperatures in the 80s and low 90s, with overnight lows only dropping into the 60s. There is a possibility of record high low night time temperatures over parts of the area. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php