National Weather Service United States Department of Commerce


A line of severe thunderstorms moved across central and southern WI. A frontal boundary was positioned west to east across south-central WI. A very unstable air mass and fast winds aloft allowed thunderstorms to quickly move eastward along this boundary. The thunderstorms evolved into a bowing line segment as they moved across south-central WI. This is called a bow echo, and is associated with very strong straight line winds. Numerous trees were down across this area.

Numerous people witnessed a waterspout/tornado over Kettle Moraine Lake in southeast Fond du Lac County (between Eden and Campbellsport) just after 7 pm. A storm damage survey revealed EF-0 tornado damage with up to 80 mph winds. There was minor damage to trees and a couple of marine structures.

Very heavy rain fell over areas north of Fond du Lac where they received over 1.5 inches of rain. Another area hit with heavy rain was near Sauk City.


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