A low pressure area and warm front resulted in rounds of strong to severe thunderstorms. Damaging winds caused tree damage and some structural damage. Large hail was also observed.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 17-MAY-17 18:01:00 to 17-MAY-17 18:07:00 (CST-6)
Location: WHITEWATER
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

A considerable number of trees and limbs down in Whitewater. Some trees or limbs down on homes and vehicles. Roads were closed due to the large number of trees blocking the roads. No electricity into the next day with schools cancelled. A corn dryer on Howard Road was disconnected from its gas line, thereby causing a fire.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 17-MAY-17 18:01:00 to 17-MAY-17 18:07:00 (CST-6)
Location: WHITEWATER
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees down on the University of Wisconsin Whitewater campus including near Perkins Stadium on the north side of Whitewater in Jefferson County.

Hail in COLUMBIA, WISCONSIN
From 17-MAY-17 14:16:00 to 17-MAY-17 14:16:00 (CST-6)
Location: PORTAGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in COLUMBIA, WISCONSIN
From 17-MAY-17 14:18:00 to 17-MAY-17 14:18:00 (CST-6)
Location: PORTAGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GREEN LAKE, WISCONSIN
From 17-MAY-17 15:18:00 to 17-MAY-17 15:18:00 (CST-6)
Location: FAIRBURN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROCK, WISCONSIN
From 17-MAY-17 17:51:00 to 17-MAY-17 17:51:00 (CST-6)
Location: DOWNTOWN JANESVILLE
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in RACINE, WISCONSIN
From 17-MAY-17 18:15:00 to 17-MAY-17 18:15:00 (CST-6)
Location: WATERFORD
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WALWORTH, WISCONSIN
From 17-MAY-17 21:56:00 to 17-MAY-17 21:56:00 (CST-6)
Location: LAKE GENEVA
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in IOWA, WISCONSIN
From 17-MAY-17 18:59:00 to 17-MAY-17 19:04:00 (CST-6)
Location: DODGEVILLE
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees and limbs down including power lines.

Thunderstorm Wind in GREEN, WISCONSIN
From 17-MAY-17 19:34:00 to 17-MAY-17 19:34:00 (CST-6)
Location: JORDAN
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Straight-line winds downed six trees.

Thunderstorm Wind in SAUK, WISCONSIN
From 17-MAY-17 13:45:00 to 17-MAY-17 13:45:00 (CST-6)
Location: MERRIMAC
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees and limbs down including power lines.

Thunderstorm Wind in SAUK, WISCONSIN
From 17-MAY-17 19:48:00 to 17-MAY-17 19:48:00 (CST-6)
Location: BARABOO
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Amateur Radio

A 20 inch diameter tree down.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 17-MAY-17 19:47:00 to 17-MAY-17 20:10:00 (CST-6)
Location: DEKORRA
Magnitude: 61.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous reports of trees and limbs down across the western portion of the county.

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 17-MAY-17 21:30:00 to 17-MAY-17 21:40:00 (CST-6)
Location: WALDO
Magnitude: 70.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

A barn blown down and two 2X4s blown into a nearby house.

Thunderstorm Wind in ROCK, WISCONSIN
From 17-MAY-17 17:36:00 to 17-MAY-17 18:00:00 (CST-6)
Location: BELOIT JCT
Magnitude: 61.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Over 200 calls pertaining to tree damage over the eastern two-thirds of the county. Some power lines down. These locations included Beloit, Janesville, Milton and other communities near these cities and east and north to the Walworth and Jefferson County borders.

Thunderstorm Wind in ROCK, WISCONSIN
From 17-MAY-17 17:44:00 to 17-MAY-17 17:49:00 (CST-6)
Location: DOWNTOWN JANESVILLE
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Trees uprooted landing on a large overhang of a home, thereby collapsing it.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 17-MAY-17 21:39:00 to 17-MAY-17 21:45:00 (CST-6)
Location: WALWORTH
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous large branches down and a few rotten trees snapped. Over 100 square feet of siding removed from a home. A power pole was leaning from the strong winds. Some power lines down.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 17-MAY-17 18:00:00 to 17-MAY-17 18:05:00 (CST-6)
Location: COLD SPG
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Newspaper

A barn lost its roof, an uprooted tree and branches down.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 17-MAY-17 18:02:00 to 17-MAY-17 18:07:00 (CST-6)
Location: FT ATKINSON
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Newspaper

Two street light poles down in Fort Atkinson, one downtown and the other on the northwest side of the city. Branches down in the city.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 17-MAY-17 18:12:00 to 17-MAY-17 18:16:00 (CST-6)
Location: OAK HILL
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large uprooted tree landing on a house.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 17-MAY-17 18:18:00 to 17-MAY-17 18:18:00 (CST-6)
Location: OAK HILL
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 17-MAY-17 18:20:00 to 17-MAY-17 18:20:00 (CST-6)
Location: OCONOMOWOC LAKE
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

A large tree uprooted.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 17-MAY-17 18:22:00 to 17-MAY-17 18:27:00 (CST-6)
Location: SUMMIT CORNERS
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous trees and limbs down.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 17-MAY-17 18:53:00 to 17-MAY-17 18:53:00 (CST-6)
Location: BELMONT
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: State Official

Several trees and limbs down along highway 126.

Thunderstorm Wind in IOWA, WISCONSIN
From 17-MAY-17 18:56:00 to 17-MAY-17 19:00:00 (CST-6)
Location: MINERAL PT
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees and limbs down including power lines.

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 17-MAY-17 21:28:00 to 17-MAY-17 21:38:00 (CST-6)
Location: BATAVIA
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

A grain bin was blown over.

Hail in ROCK, WISCONSIN
From 17-MAY-17 17:45:00 to 17-MAY-17 17:45:00 (CST-6)
Location: DOWNTOWN JANESVILLE
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in ROCK, WISCONSIN
From 17-MAY-17 17:47:00 to 17-MAY-17 17:54:00 (CST-6)
Location: FAIRFIELD
Magnitude: 70.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Walls collapsed on several older farm buildings.

Thunderstorm Wind in DANE, WISCONSIN
From 17-MAY-17 19:57:00 to 17-MAY-17 20:03:00 (CST-6)
Location: CAMP RANDALL STADIUM
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees and limbs down.