Thunderstorm Wind in Iowa County, Wisconsin

A swath of wind damage of around 9 miles long and 1.5 miles wide occurred with the rear-flank downdraft of a supercell thunderstorm that had a history of producing a tornado. Two farm properties sustained heavy outbuilding damage, with a barn wall blown out and roof pulled upward, a lean-to destroyed with sheet metal lofted into a nearby field, and a metal barn destroyed with sheet metal lofted and placed in trees by the church across the road. There were numerous hardwood trees snapped and uprooted along the path, and power poles were leaning in one location.

A cluster of thunderstorms developed within the vicinity of a strong mid-upper level shortwave trough and a surface low. One supercell tracked from southeast Minnesota through northeast Iowa and into southwest Wisconsin while maintaining is strength during the late afternoon. The storm evolved into a line as it trtacked through south central Wisconsin during the early evening and produced a swath of damaging winds and three tornadoes.