A strong surge of warm, moist, and unstable air ahead of an approaching warm front led to a large bow echo with damaging straight line winds across southern WI. Numerous tree damage and some structural damage occurred. A wake low with wind gusts up to 40 mph immediately followed the thunderstorms. There was no known tree damage from the wake low.

Thunderstorm Wind in IOWA, WISCONSIN
From 22-JUN-15 08:37:00 to 22-JUN-15 08:41:00 (CST-6)
Location: HOLLANDALE
Magnitude: 78.00 EG
Property damage: 10.00K
Reported by: NWS Storm Survey

Many trees snapped or uprooted. A section of aluminum bleachers broke away from its pedestal and tumbled 20 yards.

Thunderstorm Wind in IOWA, WISCONSIN
From 22-JUN-15 08:33:00 to 22-JUN-15 08:37:00 (CST-6)
Location: WALDWICK
Magnitude: 78.00 EG
Property damage: 10.00K
Reported by: Public

Numerous 10 to 30 inch diameter trees snapped in the town of Waldwick.

Thunderstorm Wind in IOWA, WISCONSIN
From 22-JUN-15 08:32:00 to 22-JUN-15 08:36:00 (CST-6)
Location: JONESDALE
Magnitude: 70.00 EG
Property damage: 5.00K
Reported by: Public

A pole and shed blown down near Jonesdale.

Thunderstorm Wind in IOWA, WISCONSIN
From 22-JUN-15 08:35:00 to 22-JUN-15 08:35:00 (CST-6)
Location: MINERAL POINT AIRPORT
Magnitude: 51.00 MG
Property damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in GREEN, WISCONSIN
From 22-JUN-15 08:45:00 to 22-JUN-15 08:49:00 (CST-6)
Location: POSTVILLE
Magnitude: 84.00 EG
Property damage: 20.00K
Reported by: NWS Storm Survey

Two homes with greater than 20 percent of the roof damaged or removed. Numerous large trees snapped or uprooted. A very large uprooted tree clipped the corner of a house damaging the roof, and also fell on a truck.

Thunderstorm Wind in GREEN, WISCONSIN
From 22-JUN-15 08:45:00 to 22-JUN-15 08:48:00 (CST-6)
Location: POSTVILLE
Magnitude: 87.00 EG
Property damage: 20.00K
Reported by: NWS Storm Survey

Numerous large trees snapped and uprooted. A 15 foot trailer was rolled into the side of a garage, damaging a portion of the wall.

Thunderstorm Wind in DANE, WISCONSIN
From 22-JUN-15 09:15:00 to 22-JUN-15 09:20:00 (CST-6)
Location: FITCHBURG
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Several large tree branches down on Blizzard Road. One large limb fell onto the back of a car.

Thunderstorm Wind in DANE, WISCONSIN
From 22-JUN-15 09:21:00 to 22-JUN-15 09:26:00 (CST-6)
Location: STOUGHTON
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines down at various locations in the city.

Thunderstorm Wind in ROCK, WISCONSIN
From 22-JUN-15 09:08:00 to 22-JUN-15 09:30:00 (CST-6)
Location: EVANSVILLE
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Law Enforcement

Numerous trees down in northern Rock County.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 22-JUN-15 09:39:00 to 22-JUN-15 09:45:00 (CST-6)
Location: FT ATKINSON
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Numerous trees and power lines down throughout the city.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 22-JUN-15 09:34:00 to 22-JUN-15 09:39:00 (CST-6)
Location: WHITEWATER
Magnitude: 61.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

One 12-14 inch diameter tree knocked over. Large tree limbs down.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 22-JUN-15 10:02:00 to 22-JUN-15 10:06:00 (CST-6)
Location: DOWNTOWN WAUKESHA
Magnitude: 52.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Social Media

Two foot diameter tree snapped.

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 22-JUN-15 10:14:00 to 22-JUN-15 10:17:00 (CST-6)
Location: NORTH MILWAUKEE
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Social Media

Two large tree branches down.

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 22-JUN-15 10:10:00 to 22-JUN-15 10:13:00 (CST-6)
Location: GREENFIELD
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Twelve to fourteen inch diameter tree down on a road.

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 22-JUN-15 10:11:00 to 22-JUN-15 10:15:00 (CST-6)
Location: HALES CORNERS ARPT
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A tree was uprooted and many small branches were down across the area.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 22-JUN-15 10:03:00 to 22-JUN-15 10:07:00 (CST-6)
Location: MUSKEGO LAKE
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Social Media

A large tree snapped and fell on Muskego Dam Road.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 22-JUN-15 08:19:00 to 22-JUN-15 08:24:00 (CST-6)
Location: IPSWICH
Magnitude: 78.00 EG
Property damage: 100.00K
Reported by: NWS Storm Survey

Three pole barns and one small barn all located southwest of Belmont suffered severe damage with the lost of the roofs and some walls collapsed. Large trees uprooted and snapped in Belmont. Trees down on one house causing severe roof damage and a couple mobile homes suffering minor damage from fallen trees or the high winds. Scattered trees and power lines were reported down throughout the remainder of the county.