1980 – Western Wisconsin Derecho

The Western Wisconsin Derecho was a severe weather system that moved through several western counties on July 15, 1980. It cut a 20-mile-wide swath through St Croix, Pierce, Dunn, Eau Claire, Chippewa, and Clark counties. Although much of the storm’s damage was caused by straight-line winds in excess of 100 mph, several tornadoes were also reported. The storm caused nearly $160M in damage (1980 dollars) and killed three people.