National Weather Service United States Department of Commerce


An active weather pattern brought large hail, damaging wind, flooding, and at least one brief tornado to the region on September 6th and 7th.

On Tuesday September 6th, scattered strong to severe thunderstorms impacted parts of western Wisconsin and northeast Iowa.  They dropped large hail (up to 2") in the Black River Falls, WI area and produced wind damage as they tracked east.  Another set of storms produced at least one small tornado near the Iowa-Minnesota state line, not too far from Cresco, IA.

Later that evening, and well into the morning hours of Wednesday September 7th, numerous additional thunderstorms formed and began tracking near the Minnesota-Iowa state line and into southwest Wisconsin (see radar loop to the right).  Rainfall of 4-7 inches fell and led to river and flash flooding.

Radar loop from overnight Sept.6-7
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