The National Weather Service in Milwaukee has completed their damage survey of two damaged areas near the county line of Rock and Walworth Counties. 

The tornado began near Avalon in Rock County and traveled a total distance of five miles hitting just north of Darien in Walworth County. 

There were two main areas of damage with a barn destroyed in Rock County and machine shed collapsed in Walworth County. 

The tornado was rated an EF-1 with winds up to 100 mph and had a width of approximately 50 yards.

Based on radar, it was determine the tornado occurred between 2:40 PM to 2:50 PM.

No injuries have been reported.