Southeast Wisconsin Deluged by Potentially 1000-Year Rain Event, Record Flooding Reported
Southeast Wisconsin Deluged by Potentially 1000-Year Rain Event, Record Flooding Reported
Southeast Wisconsin has been hit by an extraordinary rainfall event over the past two days, August 10-11, 2025, leading to widespread and severe flooding across the region. Areas in Milwaukee, Waukesha, and Ozaukee counties experienced precipitation totals that could qualify as a ‘1000-year rain,’ with some locations receiving over a foot of rain in less than 24 hours.
The heaviest reliable measurement recorded was a staggering 12.62 inches in Pewaukee, west of Milwaukee. An unofficial report of 14.50 inches also emerged, which, if verified by the National Weather Service, would establish a new state rainfall record for Wisconsin. The NWS is currently reviewing the unofficial gauge’s site and data, a process that could take weeks to months.
For context, a ‘100-year rain’ in this area typically ranges between six and seven inches in 24 hours, while a ‘500-year rain’ is around 8.4 inches, and a ‘1000-year rain’ is defined at 9.5 inches. The recent deluge, with multiple locations exceeding these thresholds, underscores the unprecedented nature of the flooding and its significant impact on communities.
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