Hot and very humid air overspread northwest Wisconsin from July 16th through the 19th.  The heat index approached 120 degrees in some areas at times.  Dew points reached as high as 82 degrees in the upper St Croix Valley.  Thunderstorms forming within this air mass occasionally produced local heavy rain and severe weather.
Widespread thunderstorms with intense winds and huge hail moved across northwest Wisconsin on the evening of the 19th. The most damage occurred in Douglas and Sawyer Counties.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 17-JUL-11 17:05:00 to 17-JUL-11 17:05:00 (CST-6)
Location: DRUMMOND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down around Drummond.

Thunderstorm Wind in PRICE, WISCONSIN
From 17-JUL-11 18:00:00 to 17-JUL-11 18:00:00 (CST-6)
Location: PARK FALLS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Twelve to 14 inch diameter trees were blown down across County Road E.

Thunderstorm Wind in IRON, WISCONSIN
From 17-JUL-11 18:10:00 to 17-JUL-11 18:10:00 (CST-6)
Location: SPRINGSTEAD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down near Fishermans' Landing.  Trees were also down across many other parts of Iron County.

Thunderstorm Wind in SAWYER, WISCONSIN
From 17-JUL-11 18:42:00 to 17-JUL-11 18:42:00 (CST-6)
Location: HAYWARD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

There were many reports of trees down and tree limbs bringing down power lines across Hayward.

Thunderstorm Wind in PRICE, WISCONSIN
From 17-JUL-11 18:45:00 to 17-JUL-11 18:45:00 (CST-6)
Location: DOVER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree limbs and power lines were down in Emery Township.

Thunderstorm Wind in IRON, WISCONSIN
From 17-JUL-11 18:15:00 to 17-JUL-11 18:15:00 (CST-6)
Location: SPRINGSTEAD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Campers were stranded as their canoes and boats were blown away from their campsites.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 19-JUL-11 15:52:00 to 19-JUL-11 15:52:00 (CST-6)
Location: MOOSE JCT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Branches were blown across Highway 35.  Dime-size hail also fell.

Thunderstorm Wind in WASHBURN, WISCONSIN
From 19-JUL-11 16:10:00 to 19-JUL-11 16:10:00 (CST-6)
Location: LAMPSON
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down across Highway 53.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 19-JUL-11 16:15:00 to 19-JUL-11 16:15:00 (CST-6)
Location: WASCOTT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Large trees were blown down on Smith Ridge Road.

Thunderstorm Wind in SAWYER, WISCONSIN
From 19-JUL-11 17:10:00 to 19-JUL-11 17:10:00 (CST-6)
Location: WINTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several limbs were down, including an 8 inch poplar branch.  Power was out across Winter WI.

Hail in WASHBURN, WISCONSIN
From 19-JUL-11 17:10:00 to 19-JUL-11 17:10:00 (CST-6)
Location: SPRING BROOK
Magnitude: 2.50 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

The hail shredded 100 acres of corn.

Thunderstorm Wind in WASHBURN, WISCONSIN
From 19-JUL-11 17:00:00 to 19-JUL-11 17:00:00 (CST-6)
Location: SPRING BROOK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Many 16 inch diameter maple trees were snapped off.  A large oak was uprooted and toppled.

Hail in IRON, WISCONSIN
From 17-JUL-11 17:18:00 to 17-JUL-11 17:18:00 (CST-6)
Location: MERCER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SAWYER, WISCONSIN
From 19-JUL-11 16:40:00 to 19-JUL-11 16:40:00 (CST-6)
Location: EDGEWATER
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in SAWYER, WISCONSIN
From 19-JUL-11 16:40:00 to 19-JUL-11 16:40:00 (CST-6)
Location: GRINDSTONE LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated winds of over 50 mph accompanied the hail.

Thunderstorm Wind in SAWYER, WISCONSIN
From 17-JUL-11 17:10:00 to 17-JUL-11 17:10:00 (CST-6)
Location: STONE LAKE
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds toppled a large tree onto an electrical wire, almost causing a fire.  Also, 1.5 miles west of Stone Lake a large oak tree fell across Highway 70 near Golden Pond Road.  Also, on Lake Road trees were uprooted and went through the roof a  garage and a chicken coop. A 125-year old white pine was uprooted and fell against a home, taking out a dormer.  Power was lost for at least three days. Also, strong winds hit the southeast end of Stone Lake where tree loss was in the hundreds. Many boat lifts on the lake were flipped upside down.

Hail in SAWYER, WISCONSIN
From 19-JUL-11 16:57:00 to 19-JUL-11 16:57:00 (CST-6)
Location: STONE LAKE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SAWYER, WISCONSIN
From 19-JUL-11 16:50:00 to 19-JUL-11 16:50:00 (CST-6)
Location: LEMINGTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in WASHBURN, WISCONSIN
From 19-JUL-11 17:00:00 to 19-JUL-11 17:00:00 (CST-6)
Location: SPRING BROOK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 19-JUL-11 16:10:00 to 19-JUL-11 16:10:00 (CST-6)
Location: GORDON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Six 12-inch trees were blown down and blocked Highway 35.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 19-JUL-11 15:55:00 to 19-JUL-11 15:55:00 (CST-6)
Location: MOOSE JCT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees were uprooted at a roadside rest area.

Hail in SAWYER, WISCONSIN
From 19-JUL-11 17:10:00 to 19-JUL-11 17:10:00 (CST-6)
Location: WOODDALE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WASHBURN, WISCONSIN
From 19-JUL-11 17:10:00 to 19-JUL-11 17:10:00 (CST-6)
Location: BIRCHWOOD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WASHBURN, WISCONSIN
From 19-JUL-11 17:10:00 to 19-JUL-11 17:10:00 (CST-6)
Location: SPRING BROOK
Magnitude: 70.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Newspaper

The intense winds brought down hundreds of trees. A barn was destroyed, a new recreational vehicle camper was destroyed, a home had major roof damage and a beef cow was killed.

Thunderstorm Wind in SAWYER, WISCONSIN
From 19-JUL-11 16:40:00 to 19-JUL-11 16:40:00 (CST-6)
Location: HAYWARD
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Power was out across Hayward as thunderstorms knocked trees into power lines.

Hail in SAWYER, WISCONSIN
From 19-JUL-11 22:13:00 to 19-JUL-11 22:13:00 (CST-6)
Location: LORETTA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail was accompanied by winds gusting over 50 mph.

Lightning in DOUGLAS, WISCONSIN
From 17-JUL-11 16:50:00 to 17-JUL-11 16:50:00 (CST-6)
Location: SOLON SPRINGS
Property damage: 100.00K
Crop damage: 100.00K
Reported by: Trained Spotter

Lightning hit a boat lift canopy, which burned the boat, shortly after a nearby house was hit by lightning.  The house burned.

Hail in SAWYER, WISCONSIN
From 19-JUL-11 22:29:00 to 19-JUL-11 22:29:00 (CST-6)
Location: DRAPER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning in IRON, WISCONSIN
From 17-JUL-11 17:50:00 to 17-JUL-11 17:50:00 (CST-6)
Location: MERCER
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Lightning hit a shed and the shed caught on fire.  The shed was located on Fisher Lake road in Mercer WI.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 17-JUL-11 17:03:00 to 17-JUL-11 17:03:00 (CST-6)
Location: GRANDVIEW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down near Highway 63.  Several other trees were blown down across Bayfield County.