National Weather Service United States Department of Commerce


On the evening of May 31st, thunderstorms developed early in the evening across southeast Minnesota and northeast Iowa.  These storms then tracked due east into western Wisconsin. A few of those storms became severe, producing large hail.

Toward midnight, storms started to redevelop over south central Minnesota, and then tracked eastward over the same areas.  These "training" thunderstorms dumped up to 7 inches of rain in about 12 hours, which led to flash flooding and river flooding across the area.

The next day (June 1st) the Storm Prediction Center (SPC) issued a Tornado Watch around 2 p.m. as storms began to form.  With ample instability and wind shear, the storms organized initially into supercells. The largest and strongest of these supercells originated in the southeast corner of Minnesota, and then tracked over northern La Crosse County, into Monroe County, and then moved more southeast over Adams and Juneau Counties in central Wisconsin.

A couple "weak" tornadoes touch downed in Monroe and Juneau County, with straight-line wind (microburst) and hail damage along the storm's path. The supercells gradually developed into a line of severe thunderstorms by early evening, and moved into eastern Wisconsin.

Weather map from June 1, 2000
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