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WPC Proposes Changes to Excessive Rainfall Outlook - Survey Open through September 5, 2026

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Estimated Storm Time of Arrival

Showers and thunderstorms are likely tonight into Thursday morning. The main threats include locally heavy rain (better chances south of I-90) and strong winds up to 70 mph (better chances near the Missouri River into northwest Iowa). While the risk is lower, marginally severe hail up to the size of a quarter is also possible. This graphic shows an estimated time of storm arrival and duration. While the greatest risk for severe weather is south of I-90, a few strong to severe storms are possible for areas to the north.