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Strong to severe thunderstorms impacted southeast Michigan during the morning hours of September 21st. Storms initiated over northern lower Michigan along residual outflow from the previous evening's storms over Wisconsin, reinvigorating in a region of elevated instability over northern lower Michigan. Individual cells organized into a broken line prior to reaching the Tri Cities and Saginaw Bay, around 800 AM EDT. A Severe Thunderstorm Watch was issued for southeast Michigan at 940 AM given the persistence of these storms and associated hail/wind threat. Thunderstorms maintained their organization as they tracked southeast, producing isolated hail up to 1 inch in diameter, marine thunderstorm wind gusts exceeding 34 knots (40 mph), and localized tree/power line damage per local storm reports, before exiting the CWA by 100 PM EDT.

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