Storm Record · Dane, Walworth, Waukesha Counties
July 21, 2013: Straight-line wind in Dane, Walworth and Waukesha Counties
1″
Largest hail
60
Strongest gust
6
NWS reports
What the National Weather Service recorded
Severe thunderstorms crossed southern Wisconsin during the afternoon hours of July 21st. The storms produced damaging wind gusts as well as hail up to 1 inch. Two people were hurt when their horses were struck by lightning while riding in the Kettle Moraine Forest near Eagle in Waukesha County. The thunderstorms formed in a region of focused warm air advection, with lift aided by vorticity advection from a short wave that tracked across the region.
Source: NOAA Storm Events Database · episode 78210
Every report, in the Weather Service's words
Where It Hit
| Location | County | Hazard | Size | Report |
|---|---|---|---|---|
| East Troy | Walworth | Wind | 60 mph wind | The Walworth County 911 Call Center received reports of trees and power lines downed by thunderstorm wind gusts estimated at 60 mph (52 knots) in East Troy. |
| Whitewater | Walworth | Wind | 60 mph wind | A trained spotter reported trees downed and roof damage caused by thunderstorm wind gusts estimated at 60 mph (52 knots) along a path from Whitewater to 1 mile east of Whitewater. |
| La Grange | Walworth | Wind | 60 mph wind | Law enforcement officials reported trees and power lines downed by thunderstorm wind gusts estimated at 60 mph (52 knots) in in the town of La Grange. |
| Caldwell (60.98 WNW) | Dane | Wind | 60 mph wind | The Dane County 911 call Center reported a roof was blown off a home 1 mile south of De Forest with debris from the roof damaging other homes by a possible gustnado as two outflow boundaries collided over the area. Wind gusts were estimated at 60 mph (52 knots). |
| Eagle (14.11 WSW) | Walworth | Hail | 1" hail | Law enforcement officials reported hail up to 1 inch in diameter in Whitewater. |
| Eagle | Waukesha | Hail | 0.75" hail | A trained spotter reported hail up to 3/4 of an inch in diameter in the Village of Eagle. |
Service areas this storm touched