455 FXUS01 KWBC 191925 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 323 PM EDT Sat Sep 19 2026 Valid 00Z Sun Sep 20 2026 - 00Z Tue Sep 22 2026 ...There is a Moderate Risk (level 3/4) of excessive rainfall over parts of the Upper Great Lakes, into parts of the Middle Mississippi Valley, and over parts of the Northern High Plains on Saturday.... ...There is a Slight Risk (level 2/4) of excessive rainfall over parts of the Northern/Central Plains and Northern Rockies on Sunday and the Northern Rockies and Northern High Plains on Saturday... ...There is a Slight Risk (level 2/5) of severe thunderstorms over parts of the Central/Southern Plains and Central High Plains on Saturday and Central High Plains and Southern Plains on Sunday... A wave of low pressure over the Middle Mississippi Valley will move eastward off the Northeast Coast by Monday and produce heavy rain over parts of the Upper Great Lakes into parts of the Middle Mississippi Valley. Therefore, the WPC has issued a Moderate Risk (level 3/4) of excessive rainfall over parts of the Upper Great Lakes into parts of the Middle Mississippi Valley through Sunday morning. Numerous flash flooding events are possible. In addition, many streams may flood, potentially affecting larger rivers. On Sunday, showers and thunderstorms will continue to develop along the front, producing heavy rain over parts of the Ohio Valley into parts of the Middle Mississippi Valley. Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Ohio Valley/Upper Great Lakes/Middle Mississippi Valley on Sunday into Monday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas being the most vulnerable. In addition, a second wave of low pressure over the Northern High Plains on Saturday will produce showers and thunderstorms with heavy rain. Therefore, the WPC has issued a Moderate Risk (level 3/4) of excessive rainfall over parts of the Northern High Plains Saturday into Sunday morning. Numerous flash flooding events are possible. In addition, many streams may flood, potentially affecting larger rivers. Similarly, showers and thunderstorms with heavy rain will develop over parts of the Northern High Plains on Sunday. Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Northern High Plains on Sunday into Monday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas being the most vulnerable. The SPC has also issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Central High Plains and the Central/Southern Plains through Sunday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes. Likewise, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Central High Plains from Sunday through Monday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. Additionally, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Southern Plains from Sunday through Monday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes. Elsewhere, showers and thunderstorms will develop over parts of Florida and the Southeast through Monday evening. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$