During the early evening of Wednesday, July 28th, scattered thunderstorms developed along a slowly moving frontal boundary across Northern Wisconsin. A very warm layer above the surface kept most of the activity isolated until early evening as thunderstorms developed north of St. Croix Falls to Ladysmith, Wisconsin. These storms continued to build southward, and a few developed over east-central Minnesota near Chisago City before moving into Polk County, Wisconsin.
During the evening, the storms congealed into a solid line of severe storms as they tracked southward across west central Wisconsin.
As the storms moved southward, several tight circulations developed, one stronger circulation near New Richmond produced a tornado southeast of town. This tornado damaged about one dozen homes, mostly due to shingles, soffits or siding being torn off. One house, however, had windows blown in and had partial roof damage. It also had a garage that was completely blown apart and destroyed, but the garage had been added on and was not part of the original house itself. Another house had damage to its front porch overhang, which allowed wind to enter the attic and punch a hole through the roof on the backside of the house. At a farm, an old barn collapsed. At another house, part of the roof was blown off a machine shed.
Other storm surveys revealed two areas of significant downburst winds. One was determined that a downburst blew down hundreds of trees along a broad swath from 4 miles SSW of Deer Park, to 9 miles north of Baldwin. The trees were blown down from the north, northeast or east. There was roof damage to one local business. The second area was determined that a downburst hit the west side of Spring Valley. Numerous trees, sheds and power lines were blown down. A school gymnasium roof was damaged and a lot of the debris landed on houses and vehicles. A local resident stated that the severe winds persisted for several minutes.
Outside of these damaged areas, there was minor damage to trees and power lines over Barron, Dunn, Rusk, Chippewa, St. Croix and Pierce counties.

Tornado in ST. CROIX, WISCONSIN
From 28-JUL-21 20:48:00 to 28-JUL-21 20:56:00 (CST-6)
Location: NEW RICHMOND
Tornado F-scale: EF1
Property damage: 175.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

About one dozen homes were damaged, mostly due to some shingles, soffits or siding being torn off.  One house, however, had windows blown in and had partial roof damage.  It also had a garage that was completely blown apart and destroyed, but the garage had been added on and was not part of the original house itself. Another house had damage to its front porch overhang, which allowed wind to enter the attic and punch a hole through the roof on the backside of the house. At a farm, an old barn collapsed. At another house, part of the roof was blown off a machine shed.

Hail in ST. CROIX, WISCONSIN
From 28-JUL-21 11:30:00 to 28-JUL-21 11:30:00 (CST-6)
Location: NEW RICHMOND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BARRON, WISCONSIN
From 28-JUL-21 19:25:00 to 28-JUL-21 19:25:00 (CST-6)
Location: RICE LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BARRON, WISCONSIN
From 28-JUL-21 19:35:00 to 28-JUL-21 19:35:00 (CST-6)
Location: RICE LAKE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CROIX, WISCONSIN
From 28-JUL-21 20:55:00 to 28-JUL-21 20:55:00 (CST-6)
Location: NEW RICHMOND
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CROIX, WISCONSIN
From 28-JUL-21 20:56:00 to 28-JUL-21 20:56:00 (CST-6)
Location: NEW RICHMOND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PEPIN, WISCONSIN
From 28-JUL-21 22:07:00 to 28-JUL-21 22:07:00 (CST-6)
Location: PORCUPINE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

There was a measured wind gust of 60 mph east of Porcupine from a private weather sensor.

Thunderstorm Wind in BARRON, WISCONSIN
From 28-JUL-21 20:00:00 to 28-JUL-21 20:05:00 (CST-6)
Location: CAMERON
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Several small trees and large tree branches were blown down between Cameron and Chetek.

Thunderstorm Wind in EAU CLAIRE, WISCONSIN
From 28-JUL-21 20:36:00 to 28-JUL-21 20:38:00 (CST-6)
Location: WILSON
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Several large trees were blown down in the town of Wilson.

Thunderstorm Wind in EAU CLAIRE, WISCONSIN
From 28-JUL-21 21:18:00 to 28-JUL-21 21:20:00 (CST-6)
Location: EAU CLAIRE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees were blown down in the City of Eau Claire.

Thunderstorm Wind in EAU CLAIRE, WISCONSIN
From 28-JUL-21 21:05:00 to 28-JUL-21 21:07:00 (CST-6)
Location: FAIRCHILD
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Several large trees were blown down in Fairchild.

Thunderstorm Wind in EAU CLAIRE, WISCONSIN
From 28-JUL-21 21:35:00 to 28-JUL-21 21:37:00 (CST-6)
Location: FOSTER
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A large tree was blown down east of Foster.

Thunderstorm Wind in PIERCE, WISCONSIN
From 28-JUL-21 21:15:00 to 28-JUL-21 21:20:00 (CST-6)
Location: SPRING VALLEY
Magnitude: 61.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey determined a downburst hit the west side of Spring Valley. Numerous trees, sheds and power lines were blown down. A school gymnasium roof was damaged and a lot of the debris landed on houses and vehicles. A local resident stated that the severe winds persisted for several minutes.

Thunderstorm Wind in ST. CROIX, WISCONSIN
From 28-JUL-21 20:50:00 to 28-JUL-21 20:53:00 (CST-6)
Location: HAMMOND
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 25.00K
Reported by: County Official

There was a barn and garage that was damaged, with corn flattened at County Road E and 160th Street.

Thunderstorm Wind in ST. CROIX, WISCONSIN
From 28-JUL-21 20:46:00 to 28-JUL-21 20:53:00 (CST-6)
Location: DEER PARK
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A NWS Storm Survey determined that a downburst blew down hundreds of trees along a broad swath from 4 miles SSW of Deer Park, to 9 miles north of Baldwin. The trees were blown down from the north, northeast or east. There was roof damage to one local business.

Thunderstorm Wind in ST. CROIX, WISCONSIN
From 28-JUL-21 21:17:00 to 28-JUL-21 21:19:00 (CST-6)
Location: ROBERTS
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A barn was destroyed south of Roberts.

Thunderstorm Wind in DUNN, WISCONSIN
From 28-JUL-21 20:50:00 to 28-JUL-21 21:00:00 (CST-6)
Location: CONNORSVILLE
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Dunn County had reports of scattered minor damage across the county. There were a few areas that had more power outages related to downed trees and power lines. One area in the northwest portion of the county was between Connorsville and Boyceville.

Thunderstorm Wind in DUNN, WISCONSIN
From 28-JUL-21 21:20:00 to 28-JUL-21 21:30:00 (CST-6)
Location: WESTON
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

This is the continuation of the minor damage across Dunn County. This area was more concentrated in southwest Dunn County between Weston and Eau Galle.

Thunderstorm Wind in BARRON, WISCONSIN
From 28-JUL-21 19:15:00 to 28-JUL-21 19:18:00 (CST-6)
Location: BARRONETT
Magnitude: 56.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Public

Some lake homes were damaged along Silver Lake. On the western edge of the lake there was significant tree and dock damage. One boat was lofted 20 feet from the lake and landed between two large trees.

Thunderstorm Wind in RUSK, WISCONSIN
From 28-JUL-21 19:20:00 to 28-JUL-21 19:22:00 (CST-6)
Location: BRUCE
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There were approximately 20-30 trees that were blown down on the roadways with most being poplar or dead hardwoods.  There were also some houses that were damaged from downed trees in Bruce.

Thunderstorm Wind in POLK, WISCONSIN
From 28-JUL-21 20:21:00 to 28-JUL-21 20:24:00 (CST-6)
Location: HORSE CREEK
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An area of significant downed trees was noted between Deer Creek, east-southeast toward Highway 65. The area is rural and not overly populated so damage was confined to cleanup on county roads.

Thunderstorm Wind in PEPIN, WISCONSIN
From 28-JUL-21 21:35:00 to 28-JUL-21 21:37:00 (CST-6)
Location: ARKANSAW
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

There were numerous trees and power lines blown down between Arkansaw and west of Durand. Some of the debris landed on houses and vehicles, plus some of the trees were blocking Highways 10 and 25.  The worst damage was west of the Chippewa River. Power outages were also reported in Pepin and Stockholm areas.