National Weather Service United States Department of Commerce


Just in time for the autumnal equinox, a pattern-changing series of low pressure systems and attendant strong cold front brought heavy rainfall, strong winds, and cooler temperatures to the Great Lakes region from September 21st-23rd, 2021. Heavy rainfall was aided by a deep supply of moisture, while strong winds developed in the wake of a tight surface pressure gradient around the low pressure center. Overall, a total of 2-5 inches of rain were observed, with the highest  totals in Oakland and Wayne Counties (over 5 inches in some locations). This led to localized areas of minor flooding as well as minor to moderate flooding on the Saginaw, Clinton, Huron, and Rouge Rivers. Strong winds, with localized gusts to 50 mph, were observed across Lake Huron and nearshore counties; although gusty winds impacted the entire County Warning Area (CWA), leading to scattered power outages across Southeast Michigan. Flood headlines, Gale Warnings, Small Craft Advisories, and wind headlines were all issued throughout the event period to account for these hazards. 

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