A cluster of thunderstorms developed over eastern North Dakota and northwestern Minnesota the evening of Wednesday July 20th. The outflow from the storms coalesced into a couple main bow echoes that quickly sped across northeast and central Minnesota, and then into northwest Wisconsin, during the early morning hours of Thursday July 21st. The multi-bow derecho caused extensive damage across the region from widespread straight-line winds of 60 to 80 mph. There were some isolated higher gusts to around 90 mph.

Thunderstorm Wind in ASHLAND, WISCONSIN
From 21-JUL-16 03:38:00 to 21-JUL-16 03:38:00 (CST-6)
Location: LA POINTE MADELINE I
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down on Stockton Island.

Thunderstorm Wind in ASHLAND, WISCONSIN
From 21-JUL-16 03:40:00 to 21-JUL-16 03:40:00 (CST-6)
Location: LA POINTE MADELINE I
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down on Michigan Island.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:05:00 to 21-JUL-16 03:05:00 (CST-6)
Location: IRON RIVER
Magnitude: 70.00 EG
Reported by: Trained Spotter

There were numerous trees down.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:28:00 to 21-JUL-16 03:28:00 (CST-6)
Location: WASHBURN
Magnitude: 70.00 EG
Reported by: Trained Spotter

There were 8 to 9 diameter trees down and the power was out. There were other trees damaged.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 04:02:00 to 21-JUL-16 04:02:00 (CST-6)
Location: TOPSIDE
Magnitude: 51.00 MG
Reported by: Mesonet

The weather station was the RAWS near Washburn with the identification WSHW3.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:26:00 to 21-JUL-16 03:26:00 (CST-6)
Location: LEONARDS
Magnitude: 70.00 EG
Reported by: Public

There were numerous trees down along Sunset Road west of Cable.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:05:00 to 21-JUL-16 03:05:00 (CST-6)
Location: IRON RIVER
Magnitude: 70.00 EG
Reported by: Public

There were numerous trees down near Jackman Lake.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:20:00 to 21-JUL-16 03:20:00 (CST-6)
Location: SAND BAY
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down on Sand Island.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 21-JUL-16 02:31:00 to 21-JUL-16 02:31:00 (CST-6)
Location: SUPERIOR BONG FLD AR
Magnitude: 52.00 EG
Reported by: Trained Spotter

Susquehanna Avenue near 17th St was blocked by fallen tree branches.

Thunderstorm Wind in IRON, WISCONSIN
From 21-JUL-16 04:05:00 to 21-JUL-16 04:05:00 (CST-6)
Location: IRON BELT
Magnitude: 70.00 EG
Reported by: Public

There were many trees and power lines down in Iron Belt.

Thunderstorm Wind in PRICE, WISCONSIN
From 21-JUL-16 04:40:00 to 21-JUL-16 04:40:00 (CST-6)
Location: CRANBERRY LAKE
Magnitude: 61.00 EG
Reported by: Trained Spotter

Two 50' tall pine trees were knocked down on County Road D.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 21-JUL-16 02:58:00 to 21-JUL-16 02:58:00 (CST-6)
Location: BRULE
Magnitude: 65.00 EG
Reported by: Newspaper

There were trees and at least one power line down along the county road near Brule.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 21-JUL-16 02:30:00 to 21-JUL-16 02:30:00 (CST-6)
Location: SUPERIOR
Magnitude: 52.00 EG
Reported by: Public

There was a large tree down along Belknap Street.

Thunderstorm Wind in ASHLAND, WISCONSIN
From 21-JUL-16 03:29:00 to 21-JUL-16 03:29:00 (CST-6)
Location: ASHLAND ARPT
Magnitude: 65.00 MG
Reported by: ASOS

Thunderstorm Wind in ASHLAND, WISCONSIN
From 21-JUL-16 03:30:00 to 21-JUL-16 03:30:00 (CST-6)
Location: ASHLAND
Magnitude: 70.00 EG
Reported by: Trained Spotter

There were numerous trees down in the city of Ashland. The tree diameters ranged from 8 to 10. Some branches were thrown 100' feet away.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 02:59:00 to 21-JUL-16 02:59:00 (CST-6)
Location: OULA
Magnitude: 78.00 EG
Reported by: Public

A trailer home, which was built in the 1980s, was destroyed by the straight-line winds. The trailer was in the middle of a wide open field. There were some trees down along the tree line.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 21-JUL-16 02:31:00 to 21-JUL-16 02:31:00 (CST-6)
Location: SUPERIOR
Magnitude: 61.00 EG
Reported by: Newspaper

Two docks on Barker Island were damaged.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 21-JUL-16 02:53:00 to 21-JUL-16 02:53:00 (CST-6)
Location: BLUEBERRY
Magnitude: 61.00 EG
Reported by: Trained Spotter

There were large trees down along County Road F.

Thunderstorm Wind in SAWYER, WISCONSIN
From 21-JUL-16 03:45:00 to 21-JUL-16 03:45:00 (CST-6)
Location: GRINDSTONE LAKE
Magnitude: 70.00 EG
Reported by: Public

There were trees snapped and uprooted. A tree fell onto a garage.

Thunderstorm Wind in ASHLAND, WISCONSIN
From 21-JUL-16 03:31:00 to 21-JUL-16 03:31:00 (CST-6)
Location: LA POINTE MADELINE I
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down on Oak Island.

Thunderstorm Wind in ASHLAND, WISCONSIN
From 21-JUL-16 03:38:00 to 21-JUL-16 03:38:00 (CST-6)
Location: LA POINTE MADELINE I
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down on Cat Island.

Thunderstorm Wind in SAWYER, WISCONSIN
From 21-JUL-16 03:45:00 to 21-JUL-16 03:45:00 (CST-6)
Location: THE NORTHWOODS BEACH
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down near the Northwoods Beach.

Thunderstorm Wind in SAWYER, WISCONSIN
From 21-JUL-16 03:46:00 to 21-JUL-16 03:46:00 (CST-6)
Location: THE NORTHWOODS BEACH
Magnitude: 70.00 EG
Reported by: Newspaper

There were numerous trees down along and near Skunawong Lane on East Side of Lac Courte Oreilles.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 02:59:00 to 21-JUL-16 02:59:00 (CST-6)
Location: OULA
Magnitude: 70.00 EG
Reported by: Trained Spotter

A 5' diameter tree was down. Other trees 5 to 12 in diameter were snapped. There were widespread power outages.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:18:00 to 21-JUL-16 03:18:00 (CST-6)
Location: BARKSDALE
Magnitude: 70.00 EG
Reported by: Park/Forest Service

There were numerous trees down at the Birch Grove Campground, which trapped some campers. Four campers sustained non-life-threatening injuries.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 21-JUL-16 03:17:00 to 21-JUL-16 03:17:00 (CST-6)
Location: MOQUAH
Magnitude: 78.00 EG
Reported by: Public

Groves of trees were flattened to the west-northwest of Birch Grove Campground near Forest Road 437.