Thunderstorms that developed ahead of an approaching surface boundary moved south across Wisconsin.  Some of the storms produced heavy rainfall that caused minor urban flooding, damaging winds that downed trees and power lines, and hail up to golf ball size across eastern Wisconsin.  As the storms moved across southern Lake Winnebago they produced gusts to around 40 mph that caused large waves to quickly develop, capsizing a boat with four people on board.  Three of the boat's passengers reached shore while the fourth had to be rescued by the Winnebago County Sheriff's Department.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 14-AUG-15 15:50:00 to 14-AUG-15 15:50:00 (CST-6)
Location: FREEDOM
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed trees in Freedom.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 14-AUG-15 15:45:00 to 14-AUG-15 15:45:00 (CST-6)
Location: BLACK CREEK
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed trees in Black Creek.

Thunderstorm Wind in BROWN, WISCONSIN
From 14-AUG-15 15:40:00 to 14-AUG-15 15:40:00 (CST-6)
Location: DE PERE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed trees in De Pere.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 14-AUG-15 16:00:00 to 14-AUG-15 16:00:00 (CST-6)
Location: KAUKAUNA
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds snapped large trees about five feet above the ground in Kaukauna.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 14-AUG-15 16:10:00 to 14-AUG-15 16:10:00 (CST-6)
Location: KAUKAUNA
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed trees in Kaukauna.

Thunderstorm Wind in BROWN, WISCONSIN
From 14-AUG-15 15:38:00 to 14-AUG-15 15:38:00 (CST-6)
Location: ASHWAUBENON
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorms produced a wind gust of 62 mph that was measured at Austin Straubel International Airport.

Heavy Rain in OUTAGAMIE, WISCONSIN
From 14-AUG-15 15:55:00 to 14-AUG-15 16:15:00 (CST-6)
Location: BLACK CREEK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Heavy rainfall caused street flooding on Highway 47 in Black Creek.  Water was about six inches deep.

Hail in WINNEBAGO, WISCONSIN
From 14-AUG-15 17:22:00 to 14-AUG-15 17:22:00 (CST-6)
Location: LARSEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell near the intersection of Highway 76 AND Country Highway II.

Thunderstorm Wind in BROWN, WISCONSIN
From 14-AUG-15 15:45:00 to 14-AUG-15 15:45:00 (CST-6)
Location: SUAMICO
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds tore shingles from a roof in Suamico.

Hail in WINNEBAGO, WISCONSIN
From 14-AUG-15 17:15:00 to 14-AUG-15 17:15:00 (CST-6)
Location: LARSEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel to quarter size hail fell in Clayton Township.

Hail in MARINETTE, WISCONSIN
From 14-AUG-15 14:45:00 to 14-AUG-15 14:45:00 (CST-6)
Location: WILCOX
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail fell west of Peshtigo.

Hail in LANGLADE, WISCONSIN
From 14-AUG-15 14:15:00 to 14-AUG-15 14:15:00 (CST-6)
Location: ELTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell northwest of Elton.

Hail in MARINETTE, WISCONSIN
From 14-AUG-15 14:18:00 to 14-AUG-15 14:18:00 (CST-6)
Location: MARINETTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped quarter size hail in Marinette.

Thunderstorm Wind in BROWN, WISCONSIN
From 14-AUG-15 15:35:00 to 14-AUG-15 15:35:00 (CST-6)
Location: ASHWAUBENON
Magnitude: 56.00 EG
Property damage: 6.50K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds downed power lines and a few large trees at the corner of West Point Road and Packerland Drive.

Hail in OUTAGAMIE, WISCONSIN
From 14-AUG-15 17:10:00 to 14-AUG-15 17:10:00 (CST-6)
Location: GREENVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell at the intersection of Highway 76 and Highway 96 in Greenville.

Hail in OCONTO, WISCONSIN
From 14-AUG-15 15:15:00 to 14-AUG-15 15:15:00 (CST-6)
Location: SOBIESKI
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped golf ball size hail as it passed through Sobieski.

Hail in BROWN, WISCONSIN
From 14-AUG-15 15:20:00 to 14-AUG-15 15:20:00 (CST-6)
Location: PULASKI
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped golf ball size hail as it passed through Pulaski.

Hail in OCONTO, WISCONSIN
From 14-AUG-15 14:45:00 to 14-AUG-15 14:45:00 (CST-6)
Location: OCONTO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell just to the west of Oconto.

Thunderstorm Wind in DOOR, WISCONSIN
From 14-AUG-15 13:30:00 to 14-AUG-15 13:30:00 (CST-6)
Location: ELLISON BAY
Magnitude: 52.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed a few trees and power lines near Ellison Bay.

Thunderstorm Wind in BROWN, WISCONSIN
From 14-AUG-15 15:45:00 to 14-AUG-15 15:45:00 (CST-6)
Location: CORMIER
Magnitude: 52.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed trees and power lines on the west side of Green Bay.

Thunderstorm Wind in CALUMET, WISCONSIN
From 14-AUG-15 16:27:00 to 14-AUG-15 16:27:00 (CST-6)
Location: CHILTON
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed trees in Chilton.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 14-AUG-15 16:00:00 to 14-AUG-15 16:00:00 (CST-6)
Location: KIMBERLY
Magnitude: 51.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms produced a wind gust of 59 mph that was measured at Little Chute High School.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 14-AUG-15 15:58:00 to 14-AUG-15 15:58:00 (CST-6)
Location: KIMBERLY
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed trees in Kimberly, blocking a road.

Thunderstorm Wind in BROWN, WISCONSIN
From 14-AUG-15 15:37:00 to 14-AUG-15 15:37:00 (CST-6)
Location: GREEN BAY
Magnitude: 56.00 EG
Property damage: 6.50K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed power lines and a few large trees in Green Bay.