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.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 21-JUL-13 15:30:00 to 21-JUL-13 15:30:00 (CST-6)
Location: EAST TROY
Magnitude: 52.00 EG
Property damage: 7.00K
Reported by: 911 Call Center

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.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 21-JUL-13 15:40:00 to 21-JUL-13 15:40:00 (CST-6)
Location: WHITEWATER
Magnitude: 52.00 EG
Property damage: 10.00K
Reported by: Trained Spotter

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.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 21-JUL-13 16:05:00 to 21-JUL-13 16:05:00 (CST-6)
Location: LA GRANGE
Magnitude: 52.00 EG
Property damage: 7.00K
Reported by: Law Enforcement

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.

Thunderstorm Wind in RACINE, WISCONSIN
From 21-JUL-13 16:15:00 to 21-JUL-13 16:32:00 (CST-6)
Location: WATERFORD
Magnitude: 50.00 EG
Crop damage: 14.00K
Reported by: NWS Employee

An NWS employee reported corn flattened in several fields along a path from 1 mile west-northwest of Waterford to 1 mile west-northwest of Union Grove by thunderstorm wind gusts estimated at 58 mph (50 knots).

Hail in WAUKESHA, WISCONSIN
From 21-JUL-13 15:20:00 to 21-JUL-13 15:20:00 (CST-6)
Location: EAGLE
Magnitude: 0.75 
Reported by: Trained Spotter

A trained spotter reported hail up to 3/4 of an inch in diameter in the Village of Eagle.

Hail in WALWORTH, WISCONSIN
From 21-JUL-13 15:40:00 to 21-JUL-13 15:40:00 (CST-6)
Location: EAGLE
Magnitude: 1.00 
Reported by: Law Enforcement

Law enforcement officials reported hail up to 1 inch in diameter in Whitewater.

Lightning in WAUKESHA, WISCONSIN
From 21-JUL-13 14:30:00 to 21-JUL-13 14:30:00 (CST-6)
Location: EAGLE
Reported by: Newspaper

Lightning struck the ground near a group of horse riders in the Kettle Moraine Forest near Eagle. The lightning traveled through the wet ground and passed through two of the horses and one of the riders. The second rider was injured when thrown from her horse after it was struck.

Thunderstorm Wind in DANE, WISCONSIN
From 21-JUL-13 14:30:00 to 21-JUL-13 14:30:00 (CST-6)
Location: CALDWELL
Magnitude: 52.00 EG
Property damage: 23.00K
Reported by: 911 Call Center

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).