Persistent warm and moist advection over an outflow boundary triggered thunderstorms over west central WI that organized into a large and slow moving squall line. The slow moving line of storms produced numerous areas of straight line wind damage and some areas of flash flooding over southern WI during the late afternoon and evening hours. Power outages across southern WI affected approximately 25,000 customers.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 21-JUL-16 16:04:00 to 21-JUL-16 16:16:00 (CST-6)
Location: FRIESLAND
Magnitude: 78.00 EG
Property damage: 20.00K
Reported by: NWS Storm Survey

Minor house damage, a car blown into the ditch, and multiple large trees snapped at the trunk or uprooted. A wind turbine measured a 106 mph wind gust.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 21-JUL-16 16:02:00 to 21-JUL-16 16:16:00 (CST-6)
Location: FRIESLAND
Magnitude: 78.00 EG
Property damage: 35.00K
Reported by: NWS Storm Survey

The roof and walls of barn collapsed. Some damage to the roof and walls of a home.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 21-JUL-16 19:00:00 to 21-JUL-16 19:40:00 (CST-6)
Location: CALAMINE
Magnitude: 56.00 EG
Property damage: 15.00K
Reported by: 911 Call Center

Numerous trees and power lines down throughout the county.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 21-JUL-16 16:53:00 to 21-JUL-16 17:40:00 (CST-6)
Location: WATERLOO
Magnitude: 50.00 EG
Property damage: 10.00K
Reported by: 911 Call Center

Sporadic trees and power lines down throughout the county.

Thunderstorm Wind in IOWA, WISCONSIN
From 21-JUL-16 18:25:00 to 21-JUL-16 19:25:00 (CST-6)
Location: CLYDE
Magnitude: 56.00 EG
Property damage: 15.00K
Reported by: State Official

Trees and branches down throughout the county.

Hail in DANE, WISCONSIN
From 21-JUL-16 17:30:00 to 21-JUL-16 17:30:00 (CST-6)
Location: MT HOREB
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DANE, WISCONSIN
From 21-JUL-16 17:20:00 to 21-JUL-16 17:20:00 (CST-6)
Location: MT HOREB
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DANE, WISCONSIN
From 21-JUL-16 16:54:00 to 21-JUL-16 16:54:00 (CST-6)
Location: MADISON TRUAX AIRPORT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in DANE, WISCONSIN
From 21-JUL-16 17:05:00 to 21-JUL-16 17:17:00 (CST-6)
Location: MAPLE BLUFF
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A five inch diameter tree landed on a road.

Thunderstorm Wind in DANE, WISCONSIN
From 21-JUL-16 17:15:00 to 21-JUL-16 17:25:00 (CST-6)
Location: CAMP RANDALL STADIUM
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Construction damage on University of Wisconsin campus.

Thunderstorm Wind in ROCK, WISCONSIN
From 21-JUL-16 17:20:00 to 21-JUL-16 17:35:00 (CST-6)
Location: MILTON
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees and branches down.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 21-JUL-16 17:30:00 to 21-JUL-16 17:40:00 (CST-6)
Location: DOWNTOWN WAUKESHA
Magnitude: 52.00 MG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees and branches down on the north side of Waukesha.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 21-JUL-16 17:30:00 to 21-JUL-16 17:45:00 (CST-6)
Location: LITTLE PRAIRIE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Sporadic tree damage across northern Walworth County.

Flash Flood in ROCK, WISCONSIN
From 21-JUL-16 18:40:00 to 21-JUL-16 21:15:00 (CST-6)
Location: LEYDEN
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple intersections and roads flooded and impassable in Janesville and Beloit after 1.5-2.0 inches in approximately one hour.

Flash Flood in DANE, WISCONSIN
From 21-JUL-16 18:22:00 to 21-JUL-16 20:30:00 (CST-6)
Location: MADISON MOREY ARPT
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Multiple intersections on the west to southwest side of Madison and in Middleton are flooded and impassable after 3 to 3.5 inches of rain in approximately 2 hours. Vehicles were stalled or stranded by the deep water. Water in some residential basements and some businesses flooded. 50,000 to 75,000 gallons of untreated wastewater was discharged into the public storm sewer system in Middleton.

Thunderstorm Wind in DODGE, WISCONSIN
From 21-JUL-16 16:33:00 to 21-JUL-16 16:48:00 (CST-6)
Location: PORTLAND
Magnitude: 71.00 EG
Property damage: 10.00K
Reported by: Broadcast Media

Half the roof of a large pole barn was removed by high winds.

Thunderstorm Wind in SAUK, WISCONSIN
From 21-JUL-16 16:17:00 to 21-JUL-16 16:50:00 (CST-6)
Location: NORTH FREEDOM
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines down.

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 21-JUL-16 15:30:00 to 21-JUL-16 16:10:00 (CST-6)
Location: WESTFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Many trees, branches, and power lines down throughout the county.

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 21-JUL-16 16:12:00 to 21-JUL-16 16:26:00 (CST-6)
Location: GREEN LAKE
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ten trees down in the town of Green Lake.

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 21-JUL-16 16:00:00 to 21-JUL-16 16:17:00 (CST-6)
Location: DALTON
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Emergency Manager

Trees and branches down on CR B, also near Kingston, Marquette, and Dalton.

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 21-JUL-16 16:00:00 to 21-JUL-16 16:10:00 (CST-6)
Location: PRINCETON
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Several trees down in and near Princeton.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 21-JUL-16 16:08:00 to 21-JUL-16 16:25:00 (CST-6)
Location: PARDEEVILLE
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Branches down 6-8 inches in diameter. Reports of trees and branches down across northern Columbia County.

Thunderstorm Wind in DODGE, WISCONSIN
From 21-JUL-16 16:25:00 to 21-JUL-16 16:48:00 (CST-6)
Location: SOUTH BEAVER DAM
Magnitude: 52.00 MG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees and branches down in the Beaver Dam area,  including a 36 inch diameter tree that was uprooted.

Thunderstorm Wind in DODGE, WISCONSIN
From 21-JUL-16 16:33:00 to 21-JUL-16 16:50:00 (CST-6)
Location: REESEVILLE
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Several trees and branches down, and bleachers moved by the high winds in Reeseville.

Thunderstorm Wind in SAUK, WISCONSIN
From 21-JUL-16 16:50:00 to 21-JUL-16 17:16:00 (CST-6)
Location: SAUK CITY
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines down.