Wind Damage from Storms on August 21, 2002


Synopsis of event:
A line of thunderstorms moved west to east across south-central and southeast Wisconsin. Individual storms moved northeast. A series of wet microbursts and bow echoes developed. In scattered locations, wind gusts reached hurricane force of 74 mph or higher. Some gusts were in the 90 mph range. Heavy rains and poor visibilities accompanied the gusts. Many homes were damaged. In a couple of cases, intersecting surface outflow boundries, or gust fronts, triggered a gound-based spin up of a gustnado which resulted in damage. Gustnadoes are not true tornadoes.

Reflectivity Image At 6:05 PM, a bowing line segment of storms moved through the area 1 mile southwest of Lamont in Lafayette county. These images are of the Doppler 88D Reflectivity (left) and Velocity (right) around the time the damage occurred. Images of some of the damage are included. Base Velocity Image
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Wet microburst winds tore a garage off a home and flattened an old barn and damaged trees about 1.5 miles southwest of Lamont. Winds were estimated briefly in the 75 mph range (hurricane force). Local residents reported near whiteout conditions due to heavy rain going sideways.


Reflectivity Image At 7:55 PM, a bowing line segment of storms moved through the area 1 mile northeast of the Waukesha airport in Waukesha county. These images are of the Doppler 88D Reflectivity (left) and Velocity (right) around the time the damage occurred. Images of some of the damage are included. Base Velcity Image
Damage Image Damage Image Damage Image
A 98 mph thunderstorm wet microburst started just northeast of the airport and moved northeast through Pewaukee into Brookfield to Capitol Dr. and Calhoun Rd. At least a dozen homes were damaged and numerous trees uptrooted. A 98 mph gust was measured near the intersection of Green and Duplainville Rd. A 56 mph gust occurred at Waukesha airport.


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