A mesoscale convective system over the Dakotas moved east-southeast through Wisconsin.  It was aided by a strong short wave trough aloft and a cold front dropping southeast.  Short bowing segments of storms generated damaging winds, large hail, and heavy rains that led to localize flash flooding.

Hail in MARQUETTE, WISCONSIN
From 03-JUL-07 17:10:00 to 03-JUL-07 17:10:00 (CST-6)
Location: PACKWAUKEE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 03-JUL-07 18:04:00 to 03-JUL-07 18:04:00 (CST-6)
Location: GREEN LAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst winds gusting to around 52 knots (60 mph) toppled several large trees.

Lightning in WASHINGTON, WISCONSIN
From 03-JUL-07 12:20:00 to 03-JUL-07 12:20:00 (CST-6)
Location: SLINGER
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a home in Slinger, and the resultant fire damaged only the living room and electrical wiring.

Thunderstorm Wind in SAUK, WISCONSIN
From 03-JUL-07 17:50:00 to 03-JUL-07 17:50:00 (CST-6)
Location: LAKE DELTON
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst thundestorm winds gusting to around 52 knots (60 mph) toppled large trees.  A couple power-lines came down with tree debris.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 03-JUL-07 18:00:00 to 03-JUL-07 18:00:00 (CST-6)
Location: PORTAGE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst thundestorm winds gusting to around 52 knots (60 mph) toppled large trees.  A couple power-lines came down with tree debris.

Thunderstorm Wind in DODGE, WISCONSIN
From 03-JUL-07 18:37:00 to 03-JUL-07 18:37:00 (CST-6)
Location: RANDOLPH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerful downburst thundestorm winds gusting to around 52 knots (60 ph) toppled several large trees.

Thunderstorm Wind in IOWA, WISCONSIN
From 03-JUL-07 18:45:00 to 03-JUL-07 18:45:00 (CST-6)
Location: ARENA
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst thundestorm winds gusting to around 52 knots (60 mph) toppled large trees.  Seveal power-lines came down with tree debris.

Thunderstorm Wind in IOWA, WISCONSIN
From 03-JUL-07 19:10:00 to 03-JUL-07 19:10:00 (CST-6)
Location: BARNEVELD
Magnitude: 65.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst thundestorm winds gusting to around 65 knots (75 mph) toppled hundreds of large trees in a forested area.  Several power-lines came down with tree debris.  One large tree fell onto a vehicle.  Two small sheds were destroyed by the winds, and one home sustained window damage.

Thunderstorm Wind in DANE, WISCONSIN
From 03-JUL-07 19:40:00 to 03-JUL-07 19:40:00 (CST-6)
Location: SUN PRAIRIE
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst thundestorm winds gusting to around 56 knots (65 mph) toppled several large trees. Several power-lines came down with tree debris.

Thunderstorm Wind in IOWA, WISCONSIN
From 03-JUL-07 19:40:00 to 03-JUL-07 19:40:00 (CST-6)
Location: REWEY
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful downburst thundestorm winds gusting to around 52 knots (60 mph) toppled large trees.  Seveal power-lines came down with tree debris.

Thunderstorm Wind in GREEN, WISCONSIN
From 03-JUL-07 19:55:00 to 03-JUL-07 19:55:00 (CST-6)
Location: JORDAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerful downburst thundestorm winds gusting to around 52 knots (60 mph) toppled several large trees.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 03-JUL-07 19:45:00 to 03-JUL-07 19:45:00 (CST-6)
Location: ARGYLE
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerful downburst thundestorm winds gusting to around 52 knots (60 mph) toppled several large trees and a couple power-lines came down due to tree debris.

Lightning in ROCK, WISCONSIN
From 03-JUL-07 23:30:00 to 03-JUL-07 23:30:00 (CST-6)
Location: DOWNTOWN JANESVILLE
Property damage: 275.00K
Crop damage: 0.00K
Reported by: Newspaper

A 2-story Janesville home was destroyed by a fire after ligntning struck it.

Flash Flood in MARQUETTE, WISCONSIN
From 03-JUL-07 17:15:00 to 03-JUL-07 19:30:00 (CST-6)
Location: HARRISVILLE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Slow moving thunderstorm cells trained over the same area northeast of Harrisville near and along CTH E (3 NE Harrisville or about 2.7 miles west-southwest of Budsin), resulting in a flash flood.  Water depths on road surfaces reached 2 to 3 feet, and water entered basements of several homes.  Damage occurred to personal property in the basements.  WSR-88D Doppler radar rainfall estimates were on the order of 3 to 4 inches.

Thunderstorm Wind in SAUK, WISCONSIN
From 03-JUL-07 18:36:00 to 03-JUL-07 18:40:00 (CST-6)
Location: SPRING GREEN
Magnitude: 52.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: ASOS

Powerful downburst thundestorm winds gusting to a measured 52 knots (60 mph) gust at the Lone Rock Airport (LNR) ASOS unit toppled large trees.  A couple power-lines came down with tree debris.

Lightning in WASHINGTON, WISCONSIN
From 03-JUL-07 11:10:00 to 03-JUL-07 11:10:00 (CST-6)
Location: KEWASKUM
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck an 150-year-old building's TV antenna, resulting in an attic fire.  Damage was limited to the attic and one apartment.