An area of low pressure lifted a warm front into the Northland during the day on the 26th. Behind this warm front was a moist and unstable airmass and daytime heating led to the development of strong to severe storms over northern Minnesota that moved to the southeast during the evening hours. One of the first storms was a supercell that produced hail 3 inches in diameter. Later storms continued to produce hail and damage to trees as they moved across the region. The Grand Rapids area in particular was hit hard in this event with widespread tree damage across the city. The KDLH radar was inoperable for this event but a high level of service was maintained by utilizing the KMVX and KMPX radars and one minute GOES-16 satellite data.

Thunderstorm Wind in ITASCA, MINNESOTA
From 26-JUL-21 17:17:00 to 26-JUL-21 17:19:00 (CST-6)
Location: JESSIE LAKE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Photos and video were received of damage along the shore of Jessie Lake. A dock was overturned along with a boat lift. A pontoon boat that was on the boat lift was also overturned.

Hail in CASS, MINNESOTA
From 26-JUL-21 17:34:00 to 26-JUL-21 17:35:00 (CST-6)
Location: BENA
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 26-JUL-21 17:50:00 to 26-JUL-21 17:51:00 (CST-6)
Location: HOYT LAKES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree was reported down in Bassett Township.

Thunderstorm Wind in ITASCA, MINNESOTA
From 26-JUL-21 17:50:00 to 26-JUL-21 17:52:00 (CST-6)
Location: DEER RIVER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few trees were downed in Deer River.

Thunderstorm Wind in ITASCA, MINNESOTA
From 26-JUL-21 17:55:00 to 26-JUL-21 17:57:00 (CST-6)
Location: COHASSET
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large pine tree was uprooted in Cohasset.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 26-JUL-21 18:00:00 to 26-JUL-21 18:02:00 (CST-6)
Location: ZIM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree 16 inches in diameter was uprooted in Zim.

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:05:00 to 26-JUL-21 18:07:00 (CST-6)
Location: LA PRAIRIE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:06:00 to 26-JUL-21 18:08:00 (CST-6)
Location: COLERAINE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ITASCA, MINNESOTA
From 26-JUL-21 18:08:00 to 26-JUL-21 18:10:00 (CST-6)
Location: GRAND RAPIDS ARPT
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree branches were broken off and a flag pole was snapped in half by the winds.

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:13:00 to 26-JUL-21 18:15:00 (CST-6)
Location: LA PRAIRIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:14:00 to 26-JUL-21 18:16:00 (CST-6)
Location: COLERAINE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:16:00 to 26-JUL-21 18:18:00 (CST-6)
Location: BLACKBERRY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:20:00 to 26-JUL-21 18:22:00 (CST-6)
Location: BLACKBERRY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ITASCA, MINNESOTA
From 26-JUL-21 18:28:00 to 26-JUL-21 18:30:00 (CST-6)
Location: GRAND RAPIDS ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous reports of extensive tree damage were received from Grand Rapids including nine 80 foot tall Norway pine trees that were uprooted.

Thunderstorm Wind in LAKE, MINNESOTA
From 26-JUL-21 18:36:00 to 26-JUL-21 18:38:00 (CST-6)
Location: TWO HARBORS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The top part of a healthy pine tree was knocked over by the wind and punctured a garage roof.

Thunderstorm Wind in AITKIN, MINNESOTA
From 26-JUL-21 18:40:00 to 26-JUL-21 18:42:00 (CST-6)
Location: JACOBSON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and power lines were reported down in Jacobson by the storm.

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:10:00 to 26-JUL-21 19:12:00 (CST-6)
Location: DULUTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:10:00 to 26-JUL-21 19:12:00 (CST-6)
Location: HUNTERS PARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A power line taken down due to a 50 to 60 foot tall tree snapping.

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:11:00 to 26-JUL-21 19:13:00 (CST-6)
Location: DULUTH INTL ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:15:00 to 26-JUL-21 19:17:00 (CST-6)
Location: ENDION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Half of a tree fell onto a house in the Endion neighborhood.

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 20:12:00 to 26-JUL-21 20:14:00 (CST-6)
Location: SILICA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ITASCA, MINNESOTA
From 26-JUL-21 18:20:00 to 26-JUL-21 18:22:00 (CST-6)
Location: BOVEY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few small branches were downed as well.

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 18:51:00 to 26-JUL-21 18:53:00 (CST-6)
Location: CULVER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:01:00 to 26-JUL-21 19:03:00 (CST-6)
Location: FOUR CORNERS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:02:00 to 26-JUL-21 19:04:00 (CST-6)
Location: SAGINAW
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MINNESOTA
From 26-JUL-21 19:15:00 to 26-JUL-21 19:17:00 (CST-6)
Location: ENDION
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in ITASCA, MINNESOTA
From 26-JUL-21 17:00:00 to 26-JUL-21 17:01:00 (CST-6)
Location: WIRT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A photo was received of a power pole that was snapped in Wirt.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 26-JUL-21 17:12:00 to 26-JUL-21 17:13:00 (CST-6)
Location: SIDE LAKE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Photos were received of damage to trees and docks around Side Lake.

Hail in CASS, MINNESOTA
From 26-JUL-21 17:15:00 to 26-JUL-21 17:17:00 (CST-6)
Location: SCHLEY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public