Forcing along an advancing cold front moving into a warm, moist unstable air mass over the region produced severe thunderstorms with a tornado, damaging winds and large hail over south-central and southeast Wisconsin during the evening hours of June 8th. The combination of instability, with surface-based CAPE of 3000 J/kg, and 0 to 6 km bulk shear of 40 knots produced supercell thunderstorms, with one of the cells developing an EF1 tornado over central Dane County that uprooted trees, felled power-lines, damaged three vehicles and crushed a garage. A cluster of supercell thunderstorms from Lafayette into Dane County then congealed into a bowing line that moved due east and created damaging wind gusts of 60 to 80 mph across much of the area along and south of Interstate-94.  At the height of the event, over 27,000 customers had no electric power in Southeast Wisconsin, and probably another 15 to 20,000 customers in south-central Wisconsin lost power.

Hail in IOWA, WISCONSIN
From 08-JUN-11 16:28:00 to 08-JUN-11 16:28:00 (CST-6)
Location: HIGHLAND
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DANE, WISCONSIN
From 08-JUN-11 18:56:00 to 08-JUN-11 18:56:00 (CST-6)
Location: SHOREWOOD HILLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IOWA, WISCONSIN
From 08-JUN-11 17:12:00 to 08-JUN-11 17:12:00 (CST-6)
Location: HIGHLAND
Magnitude: 1.00 
Reported by: Law Enforcement

Hail in IOWA, WISCONSIN
From 08-JUN-11 17:13:00 to 08-JUN-11 17:13:00 (CST-6)
Location: HIGHLAND
Magnitude: 2.50 
Reported by: Broadcast Media

The report was received from WMTV-15 in Madison.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 19:13:00 to 08-JUN-11 19:13:00 (CST-6)
Location: ALBION
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A grain bin was destroyed and and several large trees were uprooted.

Hail in DANE, WISCONSIN
From 08-JUN-11 18:47:00 to 08-JUN-11 18:47:00 (CST-6)
Location: MONONA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DANE, WISCONSIN
From 08-JUN-11 19:00:00 to 08-JUN-11 19:00:00 (CST-6)
Location: DOWNTOWN MADISON
Magnitude: 1.50 
Reported by: Broadcast Media

Hail in DANE, WISCONSIN
From 08-JUN-11 18:55:00 to 08-JUN-11 18:55:00 (CST-6)
Location: VERONA
Magnitude: 1.75 
Reported by: Law Enforcement

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 18:15:00 to 08-JUN-11 18:20:00 (CST-6)
Location: MT HOREB
Magnitude: 65.00 EG
Reported by: Newspaper

Powerful thunderstorm winds pushed over several large trees, and broken tree branches snapped a few power-lines in a 2 to 3 mile wide swath.  A business's tower was toppled into its parking lot.

Lightning in GREEN, WISCONSIN
From 08-JUN-11 19:20:00 to 08-JUN-11 19:20:00 (CST-6)
Location: ALBANY
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a power transformer which then caught fire.

Hail in DANE, WISCONSIN
From 08-JUN-11 18:50:00 to 08-JUN-11 18:50:00 (CST-6)
Location: MC FARLAND
Magnitude: 1.75 
Reported by: Law Enforcement

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 08-JUN-11 20:45:00 to 08-JUN-11 20:45:00 (CST-6)
Location: GREENFIELD
Magnitude: 56.00 EG
Reported by: Trained Spotter

Strong winds knocked large branches out of trees and uprooted a couple large trees.

Thunderstorm Wind in ROCK, WISCONSIN
From 08-JUN-11 19:08:00 to 08-JUN-11 19:08:00 (CST-6)
Location: EVANSVILLE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Officials reported up to 40 large trees uprooted, and numerous branches broken by powerful thunderstorm winds.

Funnel Cloud in IOWA, WISCONSIN
From 08-JUN-11 17:26:00 to 08-JUN-11 17:26:00 (CST-6)
Location: DODGEVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IOWA, WISCONSIN
From 08-JUN-11 17:14:00 to 08-JUN-11 17:22:00 (CST-6)
Location: HIGHLAND
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 08-JUN-11 17:45:00 to 08-JUN-11 17:45:00 (CST-6)
Location: MONTELLO
Magnitude: 56.00 EG
Property damage: 0.00K
Reported by: Newspaper

Several large trees were blown down.

Thunderstorm Wind in RACINE, WISCONSIN
From 08-JUN-11 20:20:00 to 08-JUN-11 20:20:00 (CST-6)
Location: BURLINGTON
Magnitude: 56.00 EG
Reported by: Newspaper

Strong winds knocked large branches out of trees and uprooted a couple dozen large trees.  A few power-lines were snapped by the broken branches. Two roads were blocked by the tree debris.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 18:38:00 to 08-JUN-11 18:42:00 (CST-6)
Location: VERONA
Magnitude: 65.00 EG
Reported by: Trained Spotter

Downburst tree damage was caused by downdrafts in a super-cell thunderstorm that spun up a nearby tornado that passed through the south side of Verona to north of McFarland.

Hail in DODGE, WISCONSIN
From 08-JUN-11 19:16:00 to 08-JUN-11 19:16:00 (CST-6)
Location: FOX LAKE
Magnitude: 0.88 
Reported by: Trained Spotter

Thunderstorm Wind in GREEN, WISCONSIN
From 08-JUN-11 19:25:00 to 08-JUN-11 19:25:00 (CST-6)
Location: BRODHEAD
Magnitude: 70.00 EG
Reported by: Newspaper

In the Brodhead area, powerful thunderstorm winds uprooted a few dozen trees and broken branches fell on and snapped several power lines.

Thunderstorm Wind in GREEN, WISCONSIN
From 08-JUN-11 19:45:00 to 08-JUN-11 19:50:00 (CST-6)
Location: MONROE
Magnitude: 56.00 EG
Reported by: Emergency Manager

Powerful thunderstorm winds, accompanied by heavy rains, uprooted several large trees and broken tree branches snapped several power lines.

Thunderstorm Wind in GREEN, WISCONSIN
From 08-JUN-11 19:10:00 to 08-JUN-11 19:15:00 (CST-6)
Location: NEW GLARUS
Magnitude: 65.00 EG
Reported by: Newspaper

Powerful thunderstorm winds, accompanied by heavy rains, uprooted several large trees in and around Monticello, and broken tree branches snapped several power lines.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 18:55:00 to 08-JUN-11 18:55:00 (CST-6)
Location: MC FARLAND
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A gust of 70 mph was measured on a home weather station.  Numerous branches were knocked down in the McFarland area.  The gusts were probably related to the rear flank downdraft of the supercell tornado that tracked just northeast of McFarland around 2000 CST (8 pm CDT).

Hail in SAUK, WISCONSIN
From 08-JUN-11 17:30:00 to 08-JUN-11 17:30:00 (CST-6)
Location: PLAIN
Magnitude: 1.50 
Reported by: Public

Hail in IOWA, WISCONSIN
From 08-JUN-11 18:14:00 to 08-JUN-11 18:14:00 (CST-6)
Location: BARNEVELD
Magnitude: 0.75 
Reported by: Trained Spotter

Thunderstorm Wind in IOWA, WISCONSIN
From 08-JUN-11 18:10:00 to 08-JUN-11 18:10:00 (CST-6)
Location: BARNEVELD
Magnitude: 56.00 EG
Reported by: Trained Spotter

Several large trees were uprooted and large branches were broken.

Hail in FOND DU LAC, WISCONSIN
From 08-JUN-11 18:45:00 to 08-JUN-11 18:45:00 (CST-6)
Location: ROSENDALE
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in GREEN, WISCONSIN
From 08-JUN-11 19:00:00 to 08-JUN-11 19:05:00 (CST-6)
Location: NEW GLARUS
Magnitude: 65.00 EG
Reported by: Newspaper

Powerful thunderstorm winds, accompanied by heavy rains, uprooted several large trees in and around New Glarus, and broken tree branches snapped several power lines.  in New Glarus, a home's roof and a backyard wooden deck suffered minor damage when a large tree fell on it.

Thunderstorm Wind in RACINE, WISCONSIN
From 08-JUN-11 20:30:00 to 08-JUN-11 20:45:00 (CST-6)
Location: STURTEVANT
Magnitude: 56.00 EG
Reported by: Amateur Radio

A 5-mile wide swath of thunderstorm wind damage occurred from the Interstate-94 area west of Racine to the city of Racine.  Semi-tractor trailers were blown over on Interstate-94 at STH 11 and CTH K, resulting in in the injury of two drivers.  A 33-foot long sailboat, that was still on land and located on the shore of the Root River near downtown Racine, was blown over and damaged.  Otherwise a couple dozen large trees were uprooted in the swath and there were reports of many large broken tree branches.

Tornado in DANE, WISCONSIN
From 08-JUN-11 18:41:00 to 08-JUN-11 19:02:00 (CST-6)
Location: VERONA
Tornado F-scale: EF0
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado spun up southwest of Verona about 1/2 mile southwest of the intersection of CTH G and Sugar River Road, and traveled east-northeast to about 3 miles northeast of McFarland about 1.5 miles east-northeast of the intersection of Interstate 39/90 and STH 12/18.  The damage path was sporadic. On the south side of Verona, numerous trees were uprooted, a garage was crushed by a fallen tree, and 3 vehicles were damaged by fallen trees.  Several power lines were pulled down by broken tree branches.  Scattered uprooted trees and/or broken tree branches were seen along the remainder of the tornado path.  However, most of the damage occurred in the Verona area.  Maximum winds in this EF1 tornado were about 95 mph based on DI 27 (TH), DOD 3.  The actual starting location was 42.98002/-89.58399 and the ending location was 43.05538/-89.26050.  The average path width was about 70 yards.

Thunderstorm Wind in IOWA, WISCONSIN
From 08-JUN-11 18:10:00 to 08-JUN-11 18:10:00 (CST-6)
Location: BARNEVELD
Magnitude: 56.00 EG
Reported by: Trained Spotter

Several large trees were uprooted and large branches were broken.

Hail in DANE, WISCONSIN
From 08-JUN-11 18:20:00 to 08-JUN-11 18:20:00 (CST-6)
Location: MT HOREB
Magnitude: 2.75 
Reported by: Broadcast Media

This report was received from WMTV-15 in Madison.

Thunderstorm Wind in IOWA, WISCONSIN
From 08-JUN-11 18:40:00 to 08-JUN-11 18:40:00 (CST-6)
Location: MINERAL PT
Magnitude: 56.00 EG
Reported by: Public

A few large trees were blown over and large branches knocked down.

Thunderstorm Wind in ROCK, WISCONSIN
From 08-JUN-11 20:03:00 to 08-JUN-11 20:03:00 (CST-6)
Location: CLINTON
Magnitude: 70.00 EG
Reported by: Trained Spotter

Powerful thunderstorm winds toppled several large trees.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 08-JUN-11 20:10:00 to 08-JUN-11 20:10:00 (CST-6)
Location: MUSKEGO
Magnitude: 65.00 EG
Reported by: Trained Spotter

Powerful thunderstorm winds toppled several large trees.  A few pieces of siding was removed from a home.

Thunderstorm Wind in IOWA, WISCONSIN
From 08-JUN-11 18:50:00 to 08-JUN-11 18:50:00 (CST-6)
Location: REWEY
Magnitude: 70.00 EG
Reported by: Law Enforcement

A couple of utility poles were pushed over by powerful thunderstorm wind gusts.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 18:54:00 to 08-JUN-11 18:54:00 (CST-6)
Location: BELLEVILLE
Magnitude: 70.00 EG
Reported by: Trained Spotter

Several large trees were uprooted as the rain and small hail moved horizontally.

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 08-JUN-11 18:19:00 to 08-JUN-11 18:37:00 (CST-6)
Location: DALTON
Magnitude: 65.00 EG
Reported by: Fire Department/Rescue

This downburst swath was about 10 miles wide.  Trees and power lines were brought down.

Hail in GREEN LAKE, WISCONSIN
From 08-JUN-11 18:23:00 to 08-JUN-11 18:23:00 (CST-6)
Location: MARQUETTE
Magnitude: 1.00 
Reported by: Emergency Manager

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 08-JUN-11 18:05:00 to 08-JUN-11 18:05:00 (CST-6)
Location: BRIGGSVILLE
Magnitude: 65.00 EG
Reported by: Newspaper

Several trees were uprooted.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 18:55:00 to 08-JUN-11 18:55:00 (CST-6)
Location: MC FARLAND
Magnitude: 61.00 MG
Reported by: Trained Spotter

Several large trees were uprooted by powerful thunderstorm winds.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 08-JUN-11 20:14:00 to 08-JUN-11 20:14:00 (CST-6)
Location: OAK HILL
Magnitude: 52.00 EG
Reported by: NWS Employee

Powerful thunderstorm winds broke numerous large tree branches and toppled several large trees in the vicinity of the Milwaukee/Sullivan WFO.

Hail in MILWAUKEE, WISCONSIN
From 08-JUN-11 20:23:00 to 08-JUN-11 20:23:00 (CST-6)
Location: WEST ALLIS
Magnitude: 1.00 
Reported by: Amateur Radio

Thunderstorm Wind in GREEN, WISCONSIN
From 08-JUN-11 19:15:00 to 08-JUN-11 19:25:00 (CST-6)
Location: DAYTON
Magnitude: 65.00 EG
Reported by: Trained Spotter

Dozens of large trees were uprooted by powerful thunderstorm winds and broken tree branches in a 3-mile wide swath from 3 miles southeast of Dayton to the Albany area.  Near the intersection of STH 59 and CTH F, a barn, built in the 1940s, was pushed over by the winds.  A hanger at the Albany Airport on STH 59 was damaged by the winds.  A few miles north-northwest of Albany the winds damaged some siding and the roof of a barn.

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 08-JUN-11 20:31:00 to 08-JUN-11 20:45:00 (CST-6)
Location: WEST ALLIS
Magnitude: 57.00 MG
Reported by: Trained Spotter

Strong winds knocked large branches out of trees and toppled several large trees.  Some power-lines were snapped by tree debris.  A trained spotter in Cudahy had a measured wind gust of 66 mph.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 08-JUN-11 19:35:00 to 08-JUN-11 19:35:00 (CST-6)
Location: HEBRON
Magnitude: 70.00 EG
Reported by: NWS Employee

Powerful thunderstorm winds pushed over several large trees.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 08-JUN-11 19:35:00 to 08-JUN-11 19:35:00 (CST-6)
Location: DELAVAN
Magnitude: 70.00 EG
Reported by: Amateur Radio

Powerful thunderstorm winds pushed over several large trees.  Roof damage was inflicted on some buildings, but the extent is unknown.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 08-JUN-11 19:56:00 to 08-JUN-11 19:56:00 (CST-6)
Location: DARIEN
Magnitude: 65.00 EG
Reported by: Amateur Radio

Powerful thunderstorm winds pushed over several large trees.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 19:17:00 to 08-JUN-11 19:25:00 (CST-6)
Location: SUN PRAIRIE
Magnitude: 65.00 EG
Reported by: Trained Spotter

Powerful thunderstorm winds pushed over several large trees, and a flag pole was pushed down.

Thunderstorm Wind in ROCK, WISCONSIN
From 08-JUN-11 19:22:00 to 08-JUN-11 19:45:00 (CST-6)
Location: EVANSVILLE
Magnitude: 70.00 EG
Reported by: Trained Spotter

Powerful thunderstorm winds pushed over dozens of large trees, and broken tree branches snapped several power lines in a 7-mile wide swath from Evansville to Milton.  In the Township of Milton, on STH 59, the skeleton of a old barn was blown down.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 08-JUN-11 19:30:00 to 08-JUN-11 19:30:00 (CST-6)
Location: FT ATKINSON
Magnitude: 65.00 EG
Reported by: Newspaper

Powerful thunderstorm wind gusts toppled several large trees.  One of the trees crashed onto and damaged a 5th wheel camper southwest of Ft. Atkinson.  Elsewhere in the Ft. Atkinson area, a roof on a home's 3-season room was ripped off by the powerful winds, and another home received moderate damage when a large tree punctured down through the roof onto a bathtub.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 08-JUN-11 19:25:00 to 08-JUN-11 19:30:00 (CST-6)
Location: CAMBRIDGE
Magnitude: 65.00 EG
Reported by: Amateur Radio

Powerful thunderstorm winds raked the area from around Cambridge east to the Jefferson area.  Dozens of large trees were uprooted, and a number of power-lines and power-poles were snapped by broken tree branches.  In Jefferson, three buildings were damaged: one of them had extensive damage to its roof and interior ceilings, a business's outdoor sign was damaged, and motel had a roof peel and several imploded windows.  A fence in a subdivision east of Cambridge was blown down.  A few roads were temporarily closed until tree debris was removed.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 08-JUN-11 19:25:00 to 08-JUN-11 19:30:00 (CST-6)
Location: LAKE MILLS
Magnitude: 65.00 EG
Reported by: Newspaper

Powerful thunderstorm wind gusts toppled several large trees.  One of the trees crashed onto a home and resulted in minor damage.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 08-JUN-11 19:54:00 to 08-JUN-11 19:54:00 (CST-6)
Location: LAKE GENEVA
Magnitude: 54.00 MG
Reported by: Amateur Radio

Powerful thunderstorm winds pushed over several large trees.

Thunderstorm Wind in DANE, WISCONSIN
From 08-JUN-11 19:15:00 to 08-JUN-11 19:25:00 (CST-6)
Location: OREGON
Magnitude: 70.00 EG
Reported by: Newspaper

Powerful thunderstorm winds pushed over dozens of large trees, and broken tree branches snapped several power-lines in a 5-mile-wide swath.  In Stoughton, the winds knocked over an empty semi-trailer which then impacted and damaged two other trailers.  Also, a road sign in Stoughton was pushed over at a 45-degree angle.