An upper level disturbance and a cold front interacting with an unstable air mass resulted in the formation of thunderstorms.  The strongest storms produced hail as large as tennis ball size and wind gusts to 60 mph.

Hail in BROWN, WISCONSIN
From 30-JUL-12 18:28:00 to 30-JUL-12 18:28:00 (CST-6)
Location: GREENLEAF
Magnitude: 1.75 
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Storm Chaser

Golf ball size hail fell in Greenleaf, cracking the windshield of at least one vehicle.

Hail in BROWN, WISCONSIN
From 30-JUL-12 16:54:00 to 30-JUL-12 16:57:00 (CST-6)
Location: CORMIER
Magnitude: 2.50 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Hail reached the size of tennis balls west of Green Bay in the village of Howard. Several homes and cars sustained minor damage from the large hail.

Hail in DOOR, WISCONSIN
From 30-JUL-12 18:30:00 to 30-JUL-12 18:30:00 (CST-6)
Location: EPHRAIM FSH CRK ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Nickel size hail fell at Peninsula State Park.

Hail in MANITOWOC, WISCONSIN
From 30-JUL-12 19:00:00 to 30-JUL-12 19:03:00 (CST-6)
Location: MARIBEL
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Large hail, at least 2 inches in diameter, fell in Maribel.

Hail in DOOR, WISCONSIN
From 30-JUL-12 19:06:00 to 30-JUL-12 19:06:00 (CST-6)
Location: EGG HARBOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell at Egg Harbor.

Hail in DOOR, WISCONSIN
From 30-JUL-12 19:15:00 to 30-JUL-12 19:15:00 (CST-6)
Location: EGG HARBOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Quarter size hail fell at Egg Harbor.

Thunderstorm Wind in MANITOWOC, WISCONSIN
From 30-JUL-12 19:35:00 to 30-JUL-12 19:35:00 (CST-6)
Location: EASTWIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds blew down trees near the Lake Michigan shore on Country Road V a few miles north of Two Rivers.

Hail in MARINETTE, WISCONSIN
From 30-JUL-12 15:20:00 to 30-JUL-12 15:20:00 (CST-6)
Location: NIAGARA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell near Niagara though most of the hailstones were pea to marble size.

Hail in WAUPACA, WISCONSIN
From 30-JUL-12 16:19:00 to 30-JUL-12 16:19:00 (CST-6)
Location: CLINTONVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell near Bear Creek.

Hail in OCONTO, WISCONSIN
From 30-JUL-12 16:30:00 to 30-JUL-12 16:30:00 (CST-6)
Location: CHASE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail to 2 inches in diameter fell west of Sobieski.

Hail in BROWN, WISCONSIN
From 30-JUL-12 18:25:00 to 30-JUL-12 18:25:00 (CST-6)
Location: MORRISON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Penny size hail fell in Morrison.

Hail in DOOR, WISCONSIN
From 30-JUL-12 18:31:00 to 30-JUL-12 18:31:00 (CST-6)
Location: FISH CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell at Fish Creek.

Hail in BROWN, WISCONSIN
From 30-JUL-12 16:42:00 to 30-JUL-12 16:42:00 (CST-6)
Location: CORMIER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell west of Green Bay, near Howard.

Hail in OCONTO, WISCONSIN
From 30-JUL-12 16:42:00 to 30-JUL-12 16:42:00 (CST-6)
Location: LITTLE SUAMICO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell in Little Suamico.

Hail in BROWN, WISCONSIN
From 30-JUL-12 16:52:00 to 30-JUL-12 16:52:00 (CST-6)
Location: GREEN BAY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Walnut size hail fell in Green Bay.

Hail in BROWN, WISCONSIN
From 30-JUL-12 16:57:00 to 30-JUL-12 16:57:00 (CST-6)
Location: SUAMICO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Quarter size hail fell south of Suamico.

Hail in BROWN, WISCONSIN
From 30-JUL-12 17:25:00 to 30-JUL-12 17:25:00 (CST-6)
Location: BELLEVUE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail fell in Bellevue.

Hail in KEWAUNEE, WISCONSIN
From 30-JUL-12 18:10:00 to 30-JUL-12 18:10:00 (CST-6)
Location: STANGELVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell southeast of Pilsen.

Hail in BROWN, WISCONSIN
From 30-JUL-12 18:10:00 to 30-JUL-12 18:12:00 (CST-6)
Location: WRIGHTSTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell for 2 minutes in Wrightstown.