A bow echo squall line moved through much of northeast Wisconsin on the afternoon of July 30th.  Winds from the storms caused considerable damage, downing numerous trees and power lines.  Some houses and cars were damaged when trees landed on them.
As many as 36,000 customers were without electricity at some time immediately after the storms passed.  Wisconsin Public Service Corporation had to call in more than 100 employees and 50 contractors to help restore power.

Hail in LINCOLN, WISCONSIN
From 30-JUL-11 13:20:00 to 30-JUL-11 13:20:00 (CST-6)
Location: MERRILL
Magnitude: 1.00 
Reported by: Public

Thunderstorms produced quarter size hail in Merrill.

Thunderstorm Wind in LANGLADE, WISCONSIN
From 30-JUL-11 13:41:00 to 30-JUL-11 13:41:00 (CST-6)
Location: ANTIGO
Magnitude: 50.00 EG
Reported by: Trained Spotter

Thunderstorm winds downed 8 to 12 inch diameter trees.

Thunderstorm Wind in WINNEBAGO, WISCONSIN
From 30-JUL-11 15:42:00 to 30-JUL-11 15:42:00 (CST-6)
Location: (OSH)WITTMAN FLD OSH
Magnitude: 50.00 EG
Reported by: NWS Employee

Thunderstorm winds tipped over portable bathrooms and knocked a trailer onto its side at the EAA Grounds.

Thunderstorm Wind in MENOMINEE (C), WISCONSIN
From 30-JUL-11 14:20:00 to 30-JUL-11 14:20:00 (CST-6)
Location: KESHENA
Magnitude: 50.00 EG
Reported by: Law Enforcement

Thunderstorm winds downed many tree branches and limbs and also knocked a one foot diameter tree onto a road.

Thunderstorm Wind in ONEIDA, WISCONSIN
From 30-JUL-11 13:09:00 to 30-JUL-11 13:09:00 (CST-6)
Location: (RHI)RHINELANDER ARP
Magnitude: 56.00 EG
Reported by: Trained Spotter

Thunderstorm winds knocked out power in the Town of Newbold.

Thunderstorm Wind in CALUMET, WISCONSIN
From 30-JUL-11 15:26:00 to 30-JUL-11 15:26:00 (CST-6)
Location: HIGH CLIFF
Magnitude: 61.00 MG
Reported by: Trained Spotter

Wind equipment that is about 40 feet above the ground near the east shore of Lake Winnebago measured a thunderstorm wind gust of 70 mph.

Thunderstorm Wind in OCONTO, WISCONSIN
From 30-JUL-11 14:20:00 to 30-JUL-11 14:20:00 (CST-6)
Location: TOWNSEND
Magnitude: 50.00 EG
Reported by: Public

Thunderstorm winds uprooted trees and lifted the table from the deck of a house and threw it into a window, breaking it.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 30-JUL-11 13:03:00 to 30-JUL-11 13:03:00 (CST-6)
Location: TOMAHAWK
Magnitude: 50.00 EG
Reported by: Newspaper

Thunderstorm winds snapped and uprooted numerous trees and downed power lines in Tomahawk and across much of northern Lincoln County.

Thunderstorm Wind in VILAS, WISCONSIN
From 30-JUL-11 12:55:00 to 30-JUL-11 12:55:00 (CST-6)
Location: ARBOR VITAE
Magnitude: 50.00 EG
Reported by: Newspaper

Thunderstorm winds downed trees near Big Arbor Vitae Lake.  One home sustained significant damage when a tree fell across its deck.

Thunderstorm Wind in ONEIDA, WISCONSIN
From 30-JUL-11 13:10:00 to 30-JUL-11 13:10:00 (CST-6)
Location: MC NAUGHTON
Magnitude: 55.00 EG
Reported by: Trained Spotter

Thunderstorm winds downed numerous 6 to 12 inch diameter trees in a small area of Fort Wilderness Camp.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 30-JUL-11 13:30:00 to 30-JUL-11 13:30:00 (CST-6)
Location: GLEASON
Magnitude: 50.00 EG
Reported by: Amateur Radio

Thunderstorm winds tore shingles from roofs and left debris on roads in Gleason.

Thunderstorm Wind in SHAWANO, WISCONSIN
From 30-JUL-11 14:14:00 to 30-JUL-11 14:14:00 (CST-6)
Location: LYNDHURST
Magnitude: 56.00 EG
Reported by: Law Enforcement

Thunderstorm winds downed numerous trees and power lines between Tilleda and Shawano.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 30-JUL-11 13:20:00 to 30-JUL-11 13:20:00 (CST-6)
Location: MERRILL
Magnitude: 50.00 EG
Property damage: 10.00K
Reported by: Public

Thunderstorm winds downed trees and power lines in Merrill and several locations in southeast Lincoln County.  One of the trees landed on a car on East Main Street in Merrill.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 30-JUL-11 14:46:00 to 30-JUL-11 14:46:00 (CST-6)
Location: NIAGARA
Magnitude: 52.00 EG
Property damage: 25.00K
Reported by: Newspaper

Thunderstorm winds downed large trees around Niagara.  A 3 foot diameter maple tree crashed down on a Niagara house, causing severe structural damage to its roof.

Thunderstorm Wind in LANGLADE, WISCONSIN
From 30-JUL-11 14:14:00 to 30-JUL-11 14:14:00 (CST-6)
Location: HOLLISTER
Magnitude: 50.00 EG
Reported by: Trained Spotter

Thunderstorm winds downed several trees and very large branches at White Lake and at Silver Birch Ranch.

Thunderstorm Wind in MARATHON, WISCONSIN
From 30-JUL-11 13:35:00 to 30-JUL-11 13:35:00 (CST-6)
Location: WAUSAU
Magnitude: 56.00 EG
Reported by: Law Enforcement

Thunderstorm winds downed numerous trees, some 4 to 5 feet in diameter, in downtown Wausau.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 30-JUL-11 14:38:00 to 30-JUL-11 14:38:00 (CST-6)
Location: CRIVITZ MUNI ARPT
Magnitude: 52.00 EG
Reported by: Amateur Radio

Thunderstorm winds knocked down trees around High Falls Reservoir, leaving two blocking a road.

Thunderstorm Wind in VILAS, WISCONSIN
From 30-JUL-11 13:15:00 to 30-JUL-11 13:15:00 (CST-6)
Location: EAGLE RIVER ARPT
Magnitude: 50.00 EG
Reported by: Newspaper

Thunderstorm winds uprooted 4 large pine trees on Perch Lake Road.

Thunderstorm Wind in LANGLADE, WISCONSIN
From 30-JUL-11 13:40:00 to 30-JUL-11 13:40:00 (CST-6)
Location: SUMMIT LAKE
Magnitude: 50.00 EG
Reported by: Newspaper

Thunderstorm winds downed trees, causing damage at Bass Lake Country Club and Golf Course.  The strong winds also lifted a paddle boat, that was on Summit Lake, out of the water and carried it up a hill.