A line of severe thunderstorms developed over southwest Wisconsin in the warm sector ahead of an approaching low pressure system.   These storms produced damaging winds, large hail up to 1.5 inches in diameter, and a weak EFO tornado that spun up near Mukwonago in Waukesha County.  A total of 5800 customers lost electrical power due to tree debris impacting power-lines across southeast Wisconsin.  At least 3800 of these customers were in the city of Whitwater (Walworth Co.).  Warm, moist air and MLCAPE values of 1000-1500 J/kg continued to fuel the storms as they moved across southern Wisconsin.  Surface air temperatures were in the upper 70s with dewpoints in the middle to upper 60s.

Thunderstorm Wind in KENOSHA, WISCONSIN
From 08-JUN-09 15:30:00 to 08-JUN-09 15:30:00 (CST-6)
Location: DOWNTOWN KENOSHA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large trees were blown down in the downtown area.

Hail in DANE, WISCONSIN
From 08-JUN-09 13:21:00 to 08-JUN-09 13:21:00 (CST-6)
Location: UTICA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 08-JUN-09 14:10:00 to 08-JUN-09 14:20:00 (CST-6)
Location: WHITEWATER
Magnitude: 56.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

This event is a continuation of a swath of thunderstorm wind damage that affected northeast Rock County and northwest Walworth County.  Many large trees were damaged or uprooted in southeast Jefferson County. The swath was about 4 miles wide.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 08-JUN-09 14:21:00 to 08-JUN-09 14:35:00 (CST-6)
Location: TROY CENTER
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A swath of thunderstorm wind damage was reported in northeast Walworth County.  The swath was about 2 miles wide.  Many large trees were uprooted or damaged.  TA roof on a home in East Troy was damaged by tree debris.

Hail in WAUKESHA, WISCONSIN
From 08-JUN-09 14:47:00 to 08-JUN-09 14:47:00 (CST-6)
Location: MUKWONAGO
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in WALWORTH, WISCONSIN
From 08-JUN-09 14:00:00 to 08-JUN-09 14:10:00 (CST-6)
Location: WHITEWATER
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A swath of thundersrtorm wind damaged affected northwest Walworth County. The swath was about 4 miles wide.  At least 200 trees were uprooted in the Whitewater area, and two vehicles ($estimated $10K in damage) were damaged by tree debris.  The tree debris also knocked out a couple feeder power-lines that resulted in 3800 customers losing electrical power.  This swath started in northeast Rock County and ended in southeast Jefferson County.

Hail in GREEN, WISCONSIN
From 08-JUN-09 13:54:00 to 08-JUN-09 13:54:00 (CST-6)
Location: BRODHEAD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROCK, WISCONSIN
From 08-JUN-09 13:45:00 to 08-JUN-09 14:00:00 (CST-6)
Location: NEWVILLE
Magnitude: 56.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A swath of thunderstorm wind damage raked northeast Rock County.  Many large trees were uprooted or damaged.  The swath was about 4 miles wide.  This event continued into northwest Walworth County and then southeast Jefferson County.

Thunderstorm Wind in RACINE, WISCONSIN
From 08-JUN-09 14:45:00 to 08-JUN-09 14:45:00 (CST-6)
Location: WATERFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large trees were blown down by thunderstorm winds in Waterford.

Tornado in WAUKESHA, WISCONSIN
From 08-JUN-09 14:38:00 to 08-JUN-09 14:42:00 (CST-6)
Location: MUKWONAGO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak, minimal EFO tornado spun up along a line of severe thunderstorms that progressed across southern Wisconsin.  The responsible supercell actually developed a mesocyclone when it crossed the Jefferson-Waukesha County line west of the village of Eagle.  The tornado started at the west end of Lower Phantom Lake and tracked just north of east through the city of Mukwanago and dissipated near the intersection of the Mukwanago River and the Fox River east of the city.  Damage was limited to uprooted trees and broken large limbs.  The winds were estimated at 56 to 61 knots (65-70 mph).  The average path width was about 30 yards.  The compass bearing was about 80 degrees.  Start and ending location was 42.86003/-88.36303 and 42.86666/-88.30144. DI#27(TH), DOD2.