Short lines of severe thunderstorms moved east-northeast through south-central and southeast Wisconsin during the overnight hours.  Some cell movement exceeded 43 kts (50 mph) to the east.  Powerful downburst winds reached hurricane-force at 64 knots or higher (74 mph+), resulting in considerable tree and power-line damage.  Synoptically, a stationary front stretched from northern Iowa to northern Illinois.  Warm, moist, unstable air flowed north over the front in association with an upper-level short-wave trough, resulting in thunderstorm generation.

Hail in DANE, WISCONSIN
From 22-AUG-07 00:25:00 to 22-AUG-07 00:25:00 (CST-6)
Location: SUN PRAIRIE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 22-AUG-07 00:02:00 to 22-AUG-07 00:02:00 (CST-6)
Location: BELMONT
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 52 knots (60 mph) toppled several large trees and damaged several power-lines.

Lightning in WAUKESHA, WISCONSIN
From 22-AUG-07 01:00:00 to 22-AUG-07 01:00:00 (CST-6)
Location: WATERVILLE
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck the roof of a church, started a fire, and damaged the church's sound system, computer system, and natural gas lines.  An automated fire-sprinkler system limited the amount of fire damage.

Thunderstorm Wind in SAUK, WISCONSIN
From 21-AUG-07 23:30:00 to 21-AUG-07 23:30:00 (CST-6)
Location: REEDSBURG
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 65 knots (75 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in SAUK, WISCONSIN
From 21-AUG-07 23:40:00 to 21-AUG-07 23:40:00 (CST-6)
Location: LAKE DELTON
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 65 knots (75 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in IOWA, WISCONSIN
From 21-AUG-07 23:25:00 to 21-AUG-07 23:25:00 (CST-6)
Location: AVOCA
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 65 knots (75 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in IOWA, WISCONSIN
From 21-AUG-07 23:40:00 to 21-AUG-07 23:40:00 (CST-6)
Location: ARENA
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 56 knots (65 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 22-AUG-07 00:12:00 to 22-AUG-07 00:12:00 (CST-6)
Location: PORTAGE
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 56 knots (65 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 22-AUG-07 00:34:00 to 22-AUG-07 00:34:00 (CST-6)
Location: CAMBRIA
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 56 knots (65 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 22-AUG-07 00:21:00 to 22-AUG-07 00:21:00 (CST-6)
Location: RIO
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 56 knots (65 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in DANE, WISCONSIN
From 22-AUG-07 00:35:00 to 22-AUG-07 00:35:00 (CST-6)
Location: OREGON
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 52 knots (60 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in DANE, WISCONSIN
From 22-AUG-07 00:25:00 to 22-AUG-07 00:25:00 (CST-6)
Location: SUN PRAIRIE
Magnitude: 53.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerful thunderstorm wind gusts to 53 knots (61 mph) toppled many trees and damaged several power-lines.

Thunderstorm Wind in SAUK, WISCONSIN
From 21-AUG-07 23:20:00 to 21-AUG-07 23:20:00 (CST-6)
Location: IRONTON
Magnitude: 61.00 MG
Property damage: 100.00K
Crop damage: 250.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts to 61 knots (70 mph) toppled many trees and damaged several power-lines.  Some corn fields in the surrounding countryside were flattened by the winds.