On June 18th small clusters of storms moved northeast through southeastern Wisconsin ahead of a cold front.  Wet microbursts  and macrobursts generated powerful wind gusts of 65 to 87 knots (75 to 100 mph) that toppled large trees, damaged power-lines and power-poles, and pushed over vehicles.  Localized flash flooding was reported.  Maximum afternoon air temperatures reached the mid to upper 80s with dewpoints in the mid to upper 60s.  About 19,400 customers lost electrical service.

Thunderstorm Wind in MILWAUKEE, WISCONSIN
From 18-JUN-07 15:29:00 to 18-JUN-07 15:32:00 (CST-6)
Location: OAK CREEK
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm winds toppled large trees and damaged power-lines.  Estimated wind gusts were on the order of 56 knots (65 mph).

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 18-JUN-07 15:52:00 to 18-JUN-07 15:52:00 (CST-6)
Location: MENOMONEE FALLS
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerful thunderstorm winds toppled large trees.  Estimated wind gusts were on the order of 52 knots (60 mph).

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 18-JUN-07 16:00:00 to 18-JUN-07 16:00:00 (CST-6)
Location: MEQUON
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Powerful thunderstorm winds toppled large trees.  Estimated wind gusts were on the order of 52 knots (60 mph).

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 18-JUN-07 15:37:00 to 18-JUN-07 15:41:00 (CST-6)
Location: BROOKFIELD
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Powerful thunderstorm winds toppled large trees.  Estimated wind gusts were on the order of 52 knots (60 mph).  One tree landed on the roof of a home, but there was only minor gutter damage.

Thunderstorm Wind in KENOSHA, WISCONSIN
From 18-JUN-07 14:57:00 to 18-JUN-07 15:12:00 (CST-6)
Location: BENET LAKE
Magnitude: 74.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A powerful macroburst moved northeast through central Kenosha County and tore up dozens of trees, and damaged a number of powerlines.  The width of the damage path was on the order of 5 to 6 miles.  Estimated peak wind gusts were probably on the order of 74 knots (85 mph).  A large tree in Bristol fell on a church, resulting in appreciable damage.  In the civil town of Paris, on CTH D, a 10' by 50' part of a home's roof was ripped off.

Thunderstorm Wind in RACINE, WISCONSIN
From 18-JUN-07 15:12:00 to 18-JUN-07 15:28:00 (CST-6)
Location: STURTEVANT
Magnitude: 74.00 EG
Property damage: 600.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A powerful macroburst moved northeast through the eastern half of Racine county and tore up hundreds of trees, blew over several semi-tractor trailers on Interstate-94 between STH 11 and 20, leveled a barn, detroyed another pole shed, riped the roof off a home, and toppled about 30 power-poles and 59 spans of wire.  Additionally, there was wind damage to the Ives Grove Golf Course, the County Board chambers, a Sheriff's Department storage building, and a Public Works Department garage.  About a half-dozen campers were overturned by the powerful winds.  Several homes sustained tree debris damage.  At least six other cars were significantly damaged by flying debris or fallen trees.  Monetary damage to the power-poles and power-lines was on the order of $90,000 alone.  Newspaper reports mentioned that the damaged swath looked like a war-zone.  The width of the damage swath was on the order of 3 to 5 miles.  Based on the structural damage it is that estimated peak wind gusts were probably on the order of 87 knots (100 mph).  Eyewitness accounts indicated that visibility was less than 10 yards due to the winds and rains.

Flash Flood in ROCK, WISCONSIN
From 18-JUN-07 21:30:00 to 18-JUN-07 23:00:00 (CST-6)
Location: BELOIT
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Repeated rounds of thunderstorms resulted in a flash flood that left water depths on some roads to around 3 feet.  Several cars were stalled and sustained water damage.  Some basements also flooded. WSR-88D Doppler radar rainfall estimates were in the 2 to 3 inch range.

Flash Flood in KENOSHA, WISCONSIN
From 18-JUN-07 23:00:00 to 18-JUN-07 23:45:00 (CST-6)
Location: SILVER LAKE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Repeated rounds of thunderstorms resulted in a brief flash flood that left water depths on some roads to 2 to 3 feet.  CTH B, south of STH 50, was washed out by fast-flowing water, and water depths in that area reached 3 feet. Some gravel shoulder washouts were also noted around Silver Lake.  WSR-88D Doppler radar rainfall estimates were in the 2 to 3 inch range.  Private citizes measured 2.6 inches in Bristol and Paris.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 18-JUN-07 14:15:00 to 18-JUN-07 14:15:00 (CST-6)
Location: FT ATKINSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Powerful thunderstorm wind gusts toppled several large trees, some up to 18 inches in diameter.