A major severe weather episode occurred across northwest Wisconsin, with thunderstorms producing tornadoes, high winds, and large hail.  A significant squall line with embedded supercells moved into northwest Wisconsin from Minnesota, with one particular storm producing three tornadoes in Ashland and Iron Counties.  The Turtle Flambeau Flowage area of Iron County was hit the worst, with several injuries at a campground, massive tree damage, and structural damage occurring.  Another area of major damage occurred in the Drummond and Delta areas, as down burst winds caused structural damage and destroyed hundreds of trees.

Hail in ASHLAND, WISCONSIN
From 27-JUL-10 17:19:00 to 27-JUL-10 17:19:00 (CST-6)
Location: HIGH BRIDGE
Magnitude: 1.75 
Reported by: Amateur Radio

Hail in ASHLAND, WISCONSIN
From 27-JUL-10 17:26:00 to 27-JUL-10 17:26:00 (CST-6)
Location: MELLEN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SAWYER, WISCONSIN
From 27-JUL-10 17:50:00 to 27-JUL-10 17:50:00 (CST-6)
Location: HAYWARD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 27-JUL-10 16:45:00 to 27-JUL-10 16:45:00 (CST-6)
Location: BENOIT
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

A roof was blown off of a barn.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 27-JUL-10 16:35:00 to 27-JUL-10 16:35:00 (CST-6)
Location: INO
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Shingles were blown from a roof and siding was damaged on a house. A barn was severely damaged.

Tornado in ASHLAND, WISCONSIN
From 27-JUL-10 18:12:00 to 27-JUL-10 18:14:00 (CST-6)
Location: PEEKSVILLE
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Tree damage was evident from Roddis Line Road north of Highway F, evident of EF0 tornado damage.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 27-JUL-10 16:00:00 to 27-JUL-10 16:00:00 (CST-6)
Location: BLUEBERRY
Magnitude: 50.00 EG
Property damage: 1.50K
Reported by: Trained Spotter

Three large trees were blown down.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 27-JUL-10 15:58:00 to 27-JUL-10 15:58:00 (CST-6)
Location: MAPLE
Magnitude: 50.00 EG
Property damage: 1.50K
Reported by: Law Enforcement

Several power lines were blown down.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 27-JUL-10 16:20:00 to 27-JUL-10 16:20:00 (CST-6)
Location: IRON RIVER
Magnitude: 52.00 EG
Property damage: 10.00K
Reported by: Trained Spotter

Trees were blown down on a recreational vehicle, trapping a camper at Twin Bear Campground.

Thunderstorm Wind in ASHLAND, WISCONSIN
From 27-JUL-10 17:28:00 to 27-JUL-10 17:28:00 (CST-6)
Location: GLIDDEN
Magnitude: 50.00 EG
Reported by: Law Enforcement

A tree was blown down.

Hail in ASHLAND, WISCONSIN
From 27-JUL-10 17:14:00 to 27-JUL-10 17:14:00 (CST-6)
Location: HIGH BRIDGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ASHLAND, WISCONSIN
From 27-JUL-10 17:17:00 to 27-JUL-10 17:17:00 (CST-6)
Location: HIGH BRIDGE
Magnitude: 1.00 
Reported by: Amateur Radio

Tornado in IRON, WISCONSIN
From 27-JUL-10 18:20:00 to 27-JUL-10 18:26:00 (CST-6)
Location: SPRINGSTEAD
Tornado F-scale: EF1
Property damage: 160.00K
Reported by: NWS Storm Survey

This tornado likely began on the southern tip of Big Island. Aerial photographs taken by the Wisconsin Department of Natural Resources showed evidence of tornado damage on smaller islands over the western part of the flowage between the Turtle Dam and Springstead Landing. These islands had large sections of trees completely destroyed - either snapped or uprooted, and the aerial photographs revealed trees laying across one another in a cross-hatched pattern, in a few cases at 90 degree incidence angles.
Substantial tree damage began occurring near Springstead Landing and east into a small neighborhood near the intersection of Flowage Rd. and Franks Ln. A stand of large trees between Flowage Landing Rd. and Simmons Rd. was completely demolished with similar evidence of tornadic winds. All of the trees were snapped or uprooted.
Impacts to cabins in the area started on the western edge of Simmons Rd. and then continued into the neighborhood near the northern tip of Flowage Rd. Some structures in this area were damaged by falling trees. The tree damage in this neighborhood was still rather significant, with large trees up to 2 feet in diameter uprooted or snapped. The tornado then continued east where uprooted and snapped trees were noted along the edge of the shoreline near campsites D-31, C-2, and D-35 before damage became much more sporadic near the canoe portage. It was at this point where the damage path narrowed and the tornado likely ended.  Three campers were injured while camping at remote campsites on the Turtle-Flambeau Flowage.

Tornado in ASHLAND, WISCONSIN
From 27-JUL-10 17:21:00 to 27-JUL-10 17:24:00 (CST-6)
Location: MORSE
Tornado F-scale: EF2
Reported by: NWS Storm Survey

There was significant damage to trees near Dry Lake Road, with evidence suggesting EF2 tornado damage.

Thunderstorm Wind in PRICE, WISCONSIN
From 27-JUL-10 19:00:00 to 27-JUL-10 19:00:00 (CST-6)
Location: PARK FALLS
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Law Enforcement

Several trees were blown down.

Hail in BAYFIELD, WISCONSIN
From 27-JUL-10 16:30:00 to 27-JUL-10 16:30:00 (CST-6)
Location: INO
Magnitude: 1.75 
Property damage: 8.00K
Reported by: Law Enforcement

Three vehicles were dented by the hail, and a police car windshield was smashed.  High winds accompanied the hail.

Hail in BAYFIELD, WISCONSIN
From 27-JUL-10 16:20:00 to 27-JUL-10 16:20:00 (CST-6)
Location: IRON RIVER
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in SAWYER, WISCONSIN
From 27-JUL-10 18:30:00 to 27-JUL-10 18:30:00 (CST-6)
Location: STONE LAKE
Magnitude: 50.00 EG
Property damage: 0.50K
Reported by: Law Enforcement

A large tree was blown down on Bouten Road.

Thunderstorm Wind in WASHBURN, WISCONSIN
From 27-JUL-10 18:52:00 to 27-JUL-10 18:52:00 (CST-6)
Location: BIRCHWOOD
Magnitude: 50.00 EG
Property damage: 15.00K
Reported by: Law Enforcement

A large pine tree was blown down on a cabin, causing a large hole in the roof.

Thunderstorm Wind in WASHBURN, WISCONSIN
From 27-JUL-10 18:30:00 to 27-JUL-10 18:30:00 (CST-6)
Location: SPOONER
Magnitude: 50.00 EG
Property damage: 0.50K
Reported by: Law Enforcement

A large tree limb was blown down on a cabin.

Hail in BAYFIELD, WISCONSIN
From 27-JUL-10 16:30:00 to 27-JUL-10 16:30:00 (CST-6)
Location: IRON RIVER
Magnitude: 1.75 
Property damage: 2.00K
Reported by: Public

The hail fell at Scenic Drive Resort.  In addition to the hail, strong winds blew down trees along County Highway H.

Hail in BAYFIELD, WISCONSIN
From 27-JUL-10 16:35:00 to 27-JUL-10 16:35:00 (CST-6)
Location: INO
Magnitude: 2.75 
Reported by: Emergency Manager

Wheat and corn fields were destroyed along County Highway E by the very large hail and high winds.

Hail in BAYFIELD, WISCONSIN
From 27-JUL-10 16:48:00 to 27-JUL-10 16:48:00 (CST-6)
Location: MASON
Magnitude: 1.00 
Property damage: 2.00K
Reported by: Post Office

A few trees were blown down, in addition to the hail.

Hail in ASHLAND, WISCONSIN
From 27-JUL-10 17:02:00 to 27-JUL-10 17:02:00 (CST-6)
Location: MARENGO
Magnitude: 1.75 
Reported by: Public

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 27-JUL-10 17:53:00 to 27-JUL-10 17:53:00 (CST-6)
Location: INO
Magnitude: 50.00 EG
Reported by: Amateur Radio

A 2-foot diameter tree was snapped.

Thunderstorm Wind in IRON, WISCONSIN
From 27-JUL-10 18:30:00 to 27-JUL-10 18:30:00 (CST-6)
Location: MERCER
Magnitude: 50.00 EG
Property damage: 10.00K
Reported by: Amateur Radio

Numerous trees and power lines were blown down along Murray Landing Road.

Thunderstorm Wind in IRON, WISCONSIN
From 27-JUL-10 18:30:00 to 27-JUL-10 18:30:00 (CST-6)
Location: MERCER
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Amateur Radio

Numerous trees were blown down.

Thunderstorm Wind in SAWYER, WISCONSIN
From 27-JUL-10 19:06:00 to 27-JUL-10 19:06:00 (CST-6)
Location: RADISSON
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

A large tree was blown down on Highway 70/27.

Hail in ASHLAND, WISCONSIN
From 27-JUL-10 17:22:00 to 27-JUL-10 17:22:00 (CST-6)
Location: MELLEN
Magnitude: 1.00 
Reported by: Trained Spotter