July 21, 2005: Straight-line wind in Jefferson and Waukesha Counties

Scattered severe thunderstorms developed during the mid to late morning hours on July 21st, across mainly southeast Wisconsin, in response to a disturbance riding along a quasi-stationary front. These storms produced primarily damaging winds that uprooted trees, and/or damaged power lines. The earliest cluster of severe storms affected northern Green County. A home in New Glarus was damaged after the powerful winds pushed a tree on its roof. One storm developed along Interstate-43 in Rock County and headed northeast through the central part of Waukesha County with winds of 56 to 61 knots (65 to 70 mph). From there it passed through Ozaukee County and out over Lake Michigan. Scattered areas of tree damage resulted from this storm, especially in the Waukesha and Brookfield areas of Waukesha County. Lightning also struck a home in Grafton (Ozaukee Co.) and set it on fire with this storm. Another storm produced a funnel cloud south of Beaver Dam (Dodge Co.).