National Weather Service United States Department of Commerce


Two rounds of thunderstorms impacted Southeastern Michigan on August 11: the first during the afternoon and the second during the late evening into the following morning. The first round produced widespread severe wind gusts across the area between 3 and 5pm as a well-organized line swept eastward across the state. This line knocked out power for hundreds of thousands of customers as widespread tree and power line damage occurred. A wind gust of 75 mph was measured in Mt. Clemens and prompted the issuance of NWS Detroit's first "Destructive" Severe Thunderstorm Warning. A lull in activity followed for much of the evening before the next round of storms tracked eastward across the region after 10pm. Severe reports were more isolated with this round, but abundant moisture moved in and led to repeated rounds of training thunderstorms that resulted in prolonged heavy rain and flooding overnight. Flash Flood Warnings were issued for Livingston County and the Detroit Metro region where some areas saw 3 to 5 inches of rain. Additional severe storms occurred the early morning of the 12th along and south of the I-94 corridor before storms finally moved out. In all, 9 Severe Thunderstorm Warnings, 2 Flash Flood Warnings, and 3 Special Marine Warnings were issued. According to DTE and Consumers Energy outage reports, nearly 850,000 customers across the state lost power due to the storms on August 11 as well as a round of storms on the 10th.

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