A surge of warm, moist, and unstable air aloft brought large thunderstorm complexes across southern WI during the evening of July 19th into the early morning hours of July 20th. The first thunderstorm complex brought damaging straight line winds to portions of south central WI, and was immediately followed by a wake low which also produced strong, damaging winds. Repeated rounds of heavy rain of 3-5 inches also produced flooding mostly south and west of Madison.

Heavy Rain in IOWA, WISCONSIN
From 21-JUL-17 01:00:00 to 21-JUL-17 09:00:00 (CST-6)
Location: AVOCA
Property damage: 360.00K
Crop damage: 300.00K
Reported by: Emergency Manager

Washouts of mainly gravel roads and driveways in the northwest portion of the county. About 50 homes with mostly minor water damage. However, the north foundation of a home collapsed while the east and west foundations buckled due to water pressure. Water was briefly over a bridge on Sunny Road at the Dodge Branch of the Pecatonica River. The flooding also led to the loss of crops.

Thunderstorm Wind in IOWA, WISCONSIN
From 19-JUL-17 18:34:00 to 19-JUL-17 18:34:00 (CST-6)
Location: ARENA
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Trees and power lines down.

Thunderstorm Wind in DANE, WISCONSIN
From 19-JUL-17 18:45:00 to 19-JUL-17 18:45:00 (CST-6)
Location: BELLEVILLE
Magnitude: 56.00 EG
Property damage: 1.00K
Reported by: Storm Chaser

Greater than 2 inch diameter tree branches down.

Thunderstorm Wind in GREEN, WISCONSIN
From 19-JUL-17 18:28:00 to 19-JUL-17 19:05:00 (CST-6)
Location: JORDAN
Magnitude: 56.00 EG
Property damage: 7.00K
Reported by: Law Enforcement

Trees and power lines down in multiple areas of the county including the city of Monroe.

Thunderstorm Wind in SAUK, WISCONSIN
From 19-JUL-17 18:35:00 to 19-JUL-17 18:35:00 (CST-6)
Location: LIMERIDGE
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Trees and power lines down in the far western portions of the county.

Thunderstorm Wind in DANE, WISCONSIN
From 19-JUL-17 18:45:00 to 19-JUL-17 18:45:00 (CST-6)
Location: BELLEVILLE
Magnitude: 56.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

Large tree branches down.

Thunderstorm Wind in ROCK, WISCONSIN
From 19-JUL-17 18:53:00 to 19-JUL-17 19:43:00 (CST-6)
Location: MAGNOLIA
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Several trees and branches down throughout the county.

Heavy Rain in GREEN, WISCONSIN
From 20-JUL-17 12:00:00 to 21-JUL-17 12:00:00 (CST-6)
Location: MONTICELLO
Property damage: 10.00K
Reported by: Law Enforcement

The west branch of the Little Sugar River and the Little Sugar River flooded during the afternoon of July 20th after several inches of overnight rain. A small number of roads near the river were closed and the parking lot for the Badger and Sugar River Bike Trails was flooded. In downtown Monticello, basement flooding occurred at a cafe, the village hall, and a chemical LLC. A portion of Fahey Road, south of Belleville, was washed out during the morning hours.

High Wind in DANE, WISCONSIN
From 19-JUL-17 20:15:00 to 19-JUL-17 21:00:00 (CST-6)
Magnitude: 61.00 EG
Property damage: 40.00K
Reported by: Law Enforcement

Wake low wind damage especially in the communities of Mount Horeb, Verona, Mt. Vernon, and the southwest side of Madison. Significant tree damage occurred. There was minor structural damage to homes in Mount Horeb due to trees landing on them or shingles being removed from high winds.

High Wind in GREEN, WISCONSIN
From 19-JUL-17 20:15:00 to 19-JUL-17 21:15:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 15.00K
Reported by: Law Enforcement

Wake low wind damage to trees and branches across the county.

Strong Wind in SAUK, WISCONSIN
From 19-JUL-17 19:45:00 to 19-JUL-17 20:30:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 3.00K
Reported by: Public

Wake low wind gusts downing tree branches.

Thunderstorm Wind in IOWA, WISCONSIN
From 19-JUL-17 17:55:00 to 19-JUL-17 18:13:00 (CST-6)
Location: MONTFORT JCT
Magnitude: 56.00 EG
Property damage: 7.00K
Reported by: Broadcast Media

Large branches and power lines down in the western portion of the county including Cobb and Mineral Point.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 19-JUL-17 17:56:00 to 19-JUL-17 18:16:00 (CST-6)
Location: IPSWICH
Magnitude: 56.00 EG
Property damage: 6.00K
Reported by: Law Enforcement

Trees and power lines down in the western portion of the county.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 19-JUL-17 18:22:00 to 19-JUL-17 18:26:00 (CST-6)
Location: SOUTH WAYNE
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Trees and power lines down and damage to a metal shed.