Storms initiated over North Dakota Friday afternoon and congealed into a large storm complex that marched across Minnesota during the evening hours and into northwest Wisconsin for the early morning hours of the 17th. Damaging winds and a few short lived tornado were produced by the complex leading to large areas of tree damage along with some property damage.

Thunderstorm Wind in BURNETT, WISCONSIN
From 18-JUL-20 00:35:00 to 18-JUL-20 00:37:00 (CST-6)
Location: (GTG)GRANTSBURG MUNI
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A small section of roof was torn off a hanger at the Grantsburg Airport.

Thunderstorm Wind in DOUGLAS, WISCONSIN
From 18-JUL-20 00:46:00 to 18-JUL-20 00:48:00 (CST-6)
Location: BLUEBERRY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous branches were broken and a measured wind gust of 53 mph was recorded as well.

Thunderstorm Wind in BURNETT, WISCONSIN
From 18-JUL-20 00:57:00 to 18-JUL-20 00:59:00 (CST-6)
Location: GASLYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The tops of numerous trees were broken off the trunk several feet off the ground and landed on a home.

Thunderstorm Wind in BURNETT, WISCONSIN
From 18-JUL-20 00:57:00 to 18-JUL-20 00:59:00 (CST-6)
Location: GASLYN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large pine trees and branches were downed during the storm. Additionally, one side of a weighted dock was flipped over.

Thunderstorm Wind in WASHBURN, WISCONSIN
From 18-JUL-20 01:10:00 to 18-JUL-20 01:12:00 (CST-6)
Location: TREGO
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A boat lift was flipped with multiple others being shifted and having their covers ripped on the north side of Spooner Lake. A window was also broken by an airborne piece of a dock weighing 40 pounds.

Thunderstorm Wind in SAWYER, WISCONSIN
From 18-JUL-20 01:39:00 to 18-JUL-20 01:41:00 (CST-6)
Location: ROUND LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Over ten large trees with trunk diameters up to 1.5 feet were either snapped or uprooted by the storm.

Thunderstorm Wind in SAWYER, WISCONSIN
From 18-JUL-20 01:45:00 to 18-JUL-20 01:47:00 (CST-6)
Location: ROUND LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sporadic damage to large trees was observed in the area. Pine and oak trees 16 to 24 inches in diameter had their tops broken off 60 feet off the ground. These falling tree tops caused roof and structure damage to a cabin.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 18-JUL-20 01:51:00 to 18-JUL-20 01:53:00 (CST-6)
Location: MASON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees were downed or broken about 15 feet above ground level.

Thunderstorm Wind in PRICE, WISCONSIN
From 18-JUL-20 02:30:00 to 18-JUL-20 02:32:00 (CST-6)
Location: FIFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Scattered tree damage was observed in the area.

Thunderstorm Wind in BAYFIELD, WISCONSIN
From 18-JUL-20 01:51:00 to 18-JUL-20 01:53:00 (CST-6)
Location: MASON
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A personal weather station mounted 10 feet above ground level recorded a gust of 63 mph.

Tornado in DOUGLAS, WISCONSIN
From 18-JUL-20 00:48:00 to 18-JUL-20 00:50:00 (CST-6)
Location: BLUEBERRY
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak, brief tornado formed along a line of thunderstorms that moved across Douglas County between 1:00 AM and 2:00 AM CDT. Meteorologists were tracking a number of weak areas of rotation on radar as these storms moved through, and a Tornado Warning was issued for one such area of rotation at 1:10 AM CDT including Maple and Blueberry. At 1:43 AM CDT, meteorologists saw a dramatic increase in radar-detected rotation from this storm just south of Maple, WI, and based on this information issued an additional Tornado Warning using radar-confirmed tornado language to indicate the
confidence in a tornado occurring or imminent. Minutes later, a tornado developed north of Maple and Blueberry knocking down dozens of trees, including snapping some trees off near the base. Just as soon as it developed, the area of rotation weakened
considerably. Radar indicates this tornado may have begun a few minutes earlier but at this time there is not enough conclusive damage evidence that the tornado formed earlier than documented.

Tornado in ASHLAND, WISCONSIN
From 18-JUL-20 01:51:00 to 18-JUL-20 01:53:00 (CST-6)
Location: SANDBORN
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado occurred near the community of Sanborn (within the township of White River) near the intersection of County Road E and Petrin Rd/Highway 112. Damage was localized to just a few properties and included a major loss of roof panels of a garage and total collapse of a metal outbuilding.