537 FXUS01 KWBC 281938 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 338 PM EDT Sat Jun 28 2025 Valid 00Z Sun Jun 29 2025 - 00Z Tue Jul 01 2025 ...There is a Slight Risk of severe thunderstorms over parts of the Upper Mississippi Valley and Northern/Central Plains on Saturday and over the Upper Great Lakes and Upper/Middle Mississippi Valley on Sunday... The leading low pressure system is tracking from the Great Lakes/Northeast region today through Sunday. Showers and thunderstorms are developing along and ahead of this system from the Mid-Atlantic to the Northeast as well as the Great Lakes region. South of the front, upper-level impulses, daytime heating, and ample amounts of moisture will develop showers and thunderstorms over the Southeast, Tennessee Valley, and Gulf Coast. The Storm Prediction Center has a Slight Risk in effect for portions of the northern Mid-Atlantic and the Northeast for severe storms and WPC has much of the same area in a Marginal Risk for Excessive Rainfall and local flash flooding concerns. A second low pressure system will be tracking through the Northern Plains and Upper Mississippi Valley. Scattered to widespread convection is expected ahead of and along the approaching fronts through Monday. The environment will be conducive for severe thunderstorms to develop across the Northern/Central Plains and portions of the Upper Mississippi Valley. The Storm Prediction Center has a Slight Risk in effect through Sunday morning and WPC has much of the same area in a Marginal Risk for Excessive Rainfall and local flash flooding concerns. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. However, there will be an increased threat of hail two inches or greater over Minnesota. Additionally, weak onshore flow and upper-level energy will produce scattered showers over parts of the Pacific Northwest. Campbell Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$