National Weather Service United States Department of Commerce


A complex thunderstorms brought severe weather and beneficial rainfall to portions of the Upper Mississippi River Valley and southwest Wisconsin on the evening on June 17, 2021.

Two supercells in particular produced destructive hailstones up to the size of baseballs along a path from Le Sueur County in south central Minnesota eastward to Wabasha and Winona counties along the Mississippi River.

Rainfall amounts were generally in the 1-3 inch range with a few higher amounts. Due to the very dry conditions present in the area, little in the way of flooding impacts were reported.

Very large hail in Buffalo City - Photo by Dave Timmons
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Rainfall Map from June 17 Hail reports from the evening storms (view interactive map) Radar imagery shows the two back-to-back supercells 
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