A cold front combined with a warm and humid air mass to trigger thunderstorms that moved across northeast Wisconsin.  The storms produced hail to golf ball size, wind gusts to 95 mph, funnel clouds and heavy rainfall that led to flash flooding.  Downed trees and power lines were common and thousands of homes lost power.

Thunderstorm Wind in VILAS, WISCONSIN
From 27-JUL-10 18:30:00 to 27-JUL-10 18:30:00 (CST-6)
Location: MANITOWISH WATERS
Magnitude: 61.00 EG
Reported by: Emergency Manager

Thunderstorm winds downed trees and power lines around Manitowish Waters and scattered other locations in Vilas County.

Thunderstorm Wind in ONEIDA, WISCONSIN
From 27-JUL-10 19:47:00 to 27-JUL-10 19:47:00 (CST-6)
Location: THREE LAKES
Magnitude: 52.00 EG
Property damage: 7.50K
Reported by: Law Enforcement

Thunderstorm winds downed trees near Three Lakes.  One of the trees fell onto a cabin.

Thunderstorm Wind in ONEIDA, WISCONSIN
From 27-JUL-10 19:48:00 to 27-JUL-10 19:48:00 (CST-6)
Location: RHINELANDER
Magnitude: 56.00 EG
Reported by: Trained Spotter

Thunderstorm winds estimated at 65 mph were reported in the Town of Newbold.

Thunderstorm Wind in OCONTO, WISCONSIN
From 27-JUL-10 21:18:00 to 27-JUL-10 21:18:00 (CST-6)
Location: MOUNTAIN BOWMAN ARPT
Magnitude: 78.00 EG
Reported by: Park/Forest Service

A strong thunderstorm downburst snapped or uprooted several hundred trees in the Nicolet National Forest about a mile north of Bear Paw Lake.

Flash Flood in FLORENCE, WISCONSIN
From 27-JUL-10 23:30:00 to 27-JUL-10 23:30:00 (CST-6)
Location: RIDGETOP
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Runoff from very heavy rainfall washed out secondary roads and culverts along Highway 70 near Florence.

Hail in SHAWANO, WISCONSIN
From 27-JUL-10 14:40:00 to 27-JUL-10 14:40:00 (CST-6)
Location: TIGERTON
Magnitude: 1.50 
Reported by: Post Office

Thunderstorms dropped ping pong ball size hail at Tigerton.

Thunderstorm Wind in SHAWANO, WISCONSIN
From 27-JUL-10 14:45:00 to 27-JUL-10 14:45:00 (CST-6)
Location: TIGERTON
Magnitude: 52.00 EG
Reported by: Trained Spotter

Thunderstorm winds downed trees in Tigerton.

Thunderstorm Wind in SHAWANO, WISCONSIN
From 27-JUL-10 14:55:00 to 27-JUL-10 14:55:00 (CST-6)
Location: SPLIT ROCK
Magnitude: 52.00 EG
Reported by: Trained Spotter

Thunderstorm wind gusts to 60 mph accompanied golf ball size hail at Split Rock.

Thunderstorm Wind in VILAS, WISCONSIN
From 27-JUL-10 19:13:00 to 27-JUL-10 19:20:00 (CST-6)
Location: STARLAKE
Magnitude: 83.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A severe thunderstorm, within a line of storms, produced downburst winds southwest of Conover.  Winds of 80 to 90 mph, with higher gusts, snapped or uprooted hundreds of trees, some as large as three feet in diameter, along a 5 mile long path.  Several homes and cabins were damaged by the fallen trees.  The storm moved over a camp where 650 people were located.  The camp staff heard the warning and was able to get everyone to safety before the storm hit.  There were no injuries from the storm.

Thunderstorm Wind in FOREST, WISCONSIN
From 27-JUL-10 19:51:00 to 27-JUL-10 19:51:00 (CST-6)
Location: NELMA
Magnitude: 61.00 EG
Reported by: Public

Thunderstorm winds downed trees on State Highway 70 near the Florence County border.  Time of report was estimated.

Thunderstorm Wind in FLORENCE, WISCONSIN
From 27-JUL-10 20:23:00 to 27-JUL-10 20:23:00 (CST-6)
Location: FLORENCE
Magnitude: 61.00 EG
Reported by: Public

Thunderstorm winds downed trees on State Highway 70 and County Road N.

Hail in SHAWANO, WISCONSIN
From 27-JUL-10 14:45:00 to 27-JUL-10 14:45:00 (CST-6)
Location: TIGERTON
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail fell at Tigerton.

Hail in SHAWANO, WISCONSIN
From 27-JUL-10 14:50:00 to 27-JUL-10 14:50:00 (CST-6)
Location: SPLIT ROCK
Magnitude: 1.25 
Reported by: Amateur Radio

Half dollar size hail fell at Split Rock.

Hail in SHAWANO, WISCONSIN
From 27-JUL-10 14:55:00 to 27-JUL-10 14:55:00 (CST-6)
Location: SPLIT ROCK
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail fell at Split Rock.

Hail in WAUPACA, WISCONSIN
From 27-JUL-10 15:17:00 to 27-JUL-10 15:17:00 (CST-6)
Location: MARION
Magnitude: 0.75 
Reported by: Public

Penny size hail fell at Marion.

Funnel Cloud in MARATHON, WISCONSIN
From 27-JUL-10 13:25:00 to 27-JUL-10 13:25:00 (CST-6)
Location: ROTHSCHILD
Reported by: Public

A funnel cloud was spotted near the intersection of County Highway Q and Weston Avenue.

Funnel Cloud in VILAS, WISCONSIN
From 27-JUL-10 18:45:00 to 27-JUL-10 18:45:00 (CST-6)
Location: LAC DU FLAMBEAU
Reported by: Law Enforcement

A funnel cloud was spotted at Lac du Flambeau.

Thunderstorm Wind in WOOD, WISCONSIN
From 27-JUL-10 22:30:00 to 27-JUL-10 22:30:00 (CST-6)
Location: WISCONSIN RAPIDS
Magnitude: 56.00 EG
Reported by: Public

Several trees were knocked down by an isolated thunderstorm that moved across far southern Wood County.  The trees blocked a road in Wisconsin Rapids.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 27-JUL-10 19:30:00 to 27-JUL-10 19:30:00 (CST-6)
Location: GOODMAN
Magnitude: 65.00 EG
Reported by: Public

Thunderstorm winds uprooted many large trees on the east side of LaFaye Lake, knocking out power and blocking at least one area road.

Thunderstorm Wind in FLORENCE, WISCONSIN
From 27-JUL-10 18:55:00 to 27-JUL-10 18:55:00 (CST-6)
Location: HEMATITE
Magnitude: 52.00 EG
Reported by: Public

Thunderstorm winds downed trees near Highway N south of Florence.

Thunderstorm Wind in OCONTO, WISCONSIN
From 27-JUL-10 21:18:00 to 27-JUL-10 21:18:00 (CST-6)
Location: MOUNTAIN
Magnitude: 61.00 EG
Reported by: Public

Thunderstorm winds downed trees in Mountain.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 27-JUL-10 20:25:00 to 27-JUL-10 20:25:00 (CST-6)
Location: MERRILL MUNI ARPT
Magnitude: 61.00 EG
Reported by: Law Enforcement

Thunderstorms downed numerous trees and caused power outages around Merrill.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 27-JUL-10 20:20:00 to 27-JUL-10 20:20:00 (CST-6)
Location: IRMA
Magnitude: 52.00 EG
Reported by: Amateur Radio

Thunderstorm winds estimated at 60 mph were reported at the intersection of County Road J and Interstate 39.

Thunderstorm Wind in MARATHON, WISCONSIN
From 27-JUL-10 21:00:00 to 27-JUL-10 21:05:00 (CST-6)
Location: WAUSAU
Magnitude: 52.00 EG
Reported by: Broadcast Media

Thunderstorm winds caused damage in the Wausau area.  Power lines were downed just west of U.S. Highway 51 on Stewart Avenue and trees were knocked down on Bridge Street.

Thunderstorm Wind in OCONTO, WISCONSIN
From 27-JUL-10 21:22:00 to 27-JUL-10 21:22:00 (CST-6)
Location: MOUNTAIN
Magnitude: 56.00 EG
Reported by: Public

Thunderstorm winds downed trees in Mountain.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 27-JUL-10 21:29:00 to 27-JUL-10 21:29:00 (CST-6)
Location: CRIVITZ
Magnitude: 52.00 EG
Reported by: Public

Thunderstorm winds downed trees in Crivitz.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 27-JUL-10 21:52:00 to 27-JUL-10 21:52:00 (CST-6)
Location: PESHTIGO
Magnitude: 52.00 EG
Reported by: Public

Thunderstorm winds downed trees in Peshtigo.

Thunderstorm Wind in FLORENCE, WISCONSIN
From 27-JUL-10 18:00:00 to 27-JUL-10 18:00:00 (CST-6)
Location: TIPLER
Magnitude: 56.00 EG
Reported by: Public

Thunderstorms winds downed trees at the intersection of State Highways 70 and 139 near Tipler.  Time of report is estimated.