Discrete supercell thunderstorms congealed into a line of severe thunderstorms over southwest Wisconsin that produced damaging wind gusts and large hail. The line of storms tracked through southern Wisconsin along and just north of a nearly-stationary warm front near the Wisconsin/Illinois border. Strong forcing for ascent was provided by the differential cyclonic vorticity advection associated with a compact mid/upper level trough. Bulk shear in the 0-6 km layer was on the order of 50-60 knots. In addition to the damaging winds and large hail, precipitable water values approached 2 inches, giving the storms sufficient moisture to produce heavy rainfall on the order of 1 to 2 inches in under one hour that caused localized street flooding.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 12-JUN-13 17:23:00 to 12-JUN-13 17:23:00 (CST-6)
Location: WATERLOO
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Emergency Manager

The Jefferson County Emergency Manager reported many trees and power lines were blown down in Waterloo from damaging thunderstorm wind gusts that were estimated up to 65 mph ( knots).

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 12-JUN-13 17:40:00 to 12-JUN-13 17:40:00 (CST-6)
Location: FT ATKINSON
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Emergency Manager

The Jefferson County Emergency Manager reported a couple of large trees and power lines were blown down in Ft. Atkinson from damaging thunderstorm wind gusts that were estimated up to 65 mph (56 knots).

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 12-JUN-13 17:33:00 to 12-JUN-13 17:33:00 (CST-6)
Location: WATERTOWN
Magnitude: 52.00 EG
Property damage: 10.00K
Reported by: Emergency Manager

The Jefferson County Emergency Manager reported trees and power lines were blown down in Watertown from damaging thunderstorm wind gusts that were estimated up to 60 mph (52 knots).

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 12-JUN-13 18:00:00 to 12-JUN-13 18:00:00 (CST-6)
Location: PEWAUKEE
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Law Enforcement

Law enforcement officials reported trees and power lines were blown down along a scattered path from Pewaukee to Eagle from damaging thunderstorm wind gusts that were estimated up to 65 mph (56 knots). Tree debris took down a power line in Eagle.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 12-JUN-13 18:15:00 to 12-JUN-13 18:15:00 (CST-6)
Location: BROOKFIELD
Magnitude: 56.00 EG
Property damage: 25.00K
Reported by: Law Enforcement

The Waukesha County Emergency Manager reported trees and power lines were blown down in Brookfield from damaging thunderstorm wind gusts that were estimated up to 65 mph (56 knots). One tree fell onto a church roof causing damage to the roof.

Hail in WALWORTH, WISCONSIN
From 12-JUN-13 17:15:00 to 12-JUN-13 17:15:00 (CST-6)
Location: WILLIAMS BAY
Magnitude: 1.00 
Reported by: Amateur Radio

An ham radio operator reported hail up to 1 inch 1 mile east-northeast of Williams Bay.

Hail in COLUMBIA, WISCONSIN
From 12-JUN-13 16:31:00 to 12-JUN-13 16:31:00 (CST-6)
Location: RIO
Magnitude: 0.75 
Reported by: Trained Spotter

A trained spotter reported hail up to 3/4 of an inch 1 mile west of Rio.

Hail in WALWORTH, WISCONSIN
From 12-JUN-13 17:20:00 to 12-JUN-13 17:20:00 (CST-6)
Location: WILLIAMS BAY
Magnitude: 0.88 
Reported by: Law Enforcement

A law enforcement official reported hail up to 0.88 of an inch on the campus of George Williams College.

Thunderstorm Wind in DODGE, WISCONSIN
From 12-JUN-13 17:00:00 to 12-JUN-13 17:00:00 (CST-6)
Location: FOX LAKE
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Emergency Manager

The Dodge County Emergency Manager reported many trees and power lines were blown down along a 10 mile-wide path from 5 miles southwest of Fox Lake to 4 miles south of Juneau from damaging thunderstorm wind gusts that were estimated up to 70 mph (61 knots).

Thunderstorm Wind in DANE, WISCONSIN
From 12-JUN-13 17:00:00 to 12-JUN-13 17:00:00 (CST-6)
Location: MARSHALL
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Trained Spotter

A trained spotter reported many large trees were blown down 7 miles north of Marshall from damaging thunderstorm wind gusts that were estimated up to 70 mph (61 knots).

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 12-JUN-13 16:08:00 to 12-JUN-13 17:00:00 (CST-6)
Location: PORTAGE
Magnitude: 70.00 EG
Property damage: 150.00K
Reported by: 911 Call Center

The Columbia County 911 Call Center reported approximately 100 trees were blown down, many power lines downed and scattered clusters of damage along a 17 mile-wide path from 5 miles southwest of Portage to Columbus from damaging thunderstorm wind gusts that were estimated up to 80 mph. A trained spotter recrded a 71 mph wind gust in Pardeeville. The roof was blown off a home and a garage was destroyed in Fall River. A home was destroyed and 2 houses damaged in the Town of Dakorra. Heavy rain accompanying the storms, with 1.58 inches measured in 45 minutes 3 miles east of Poynette, produced street flooding in Portage and Pardeeville.