Two storm systems, one to the north and the other to south, moved across most of northeastern Minnesota. The northern storm caused hail and sporadic wind damage until it moved to the north and northeast of Duluth where it blew down numerous trees in the Fredenberg and Island Lake areas. The southern storm system evolved into a bow echo that produced damaging winds.

Thunderstorm Wind in ITASCA, MINNESOTA
From 21-JUL-17 16:43:00 to 21-JUL-17 16:43:00 (CST-6)
Location: CALUMET
Magnitude: 52.00 EG
Reported by: Trained Spotter

A 2 foot diameter oak tree was blown down onto a trailer.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 21-JUL-17 17:47:00 to 21-JUL-17 17:47:00 (CST-6)
Location: CANYON
Magnitude: 56.00 EG
Reported by: Public

Several large trees were blown down.

Thunderstorm Wind in AITKIN, MINNESOTA
From 21-JUL-17 17:54:00 to 21-JUL-17 17:54:00 (CST-6)
Location: HILL CITY
Magnitude: 50.00 EG
Reported by: State Official

Several trees were blown down.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 21-JUL-17 20:05:00 to 21-JUL-17 20:05:00 (CST-6)
Location: ARNOLD
Magnitude: 50.00 EG
Reported by: Storm Chaser

Numerous trees were blown down.

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 16:45:00 to 21-JUL-17 16:45:00 (CST-6)
Location: CASS LAKE
Magnitude: 56.00 EG
Reported by: Trained Spotter

The siding on the Palace Casino in Cass Lake was torn off by thunderstorm winds.

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 16:45:00 to 21-JUL-17 16:45:00 (CST-6)
Location: CASS LAKE
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees as large as eighteen inches in diameter were blown down. Some trees were also uprooted.

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 17:05:00 to 21-JUL-17 17:05:00 (CST-6)
Location: AH GWAN CHING
Magnitude: 50.00 EG
Reported by: NWS Employee

A couple trees were blown down.

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 17:10:00 to 21-JUL-17 17:10:00 (CST-6)
Location: SCHLEY
Magnitude: 50.00 MG
Reported by: Mesonet

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 17:25:00 to 21-JUL-17 17:25:00 (CST-6)
Location: LONGVILLE
Magnitude: 50.00 EG
Reported by: Trained Spotter

A large tree was blown down.

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 17:29:00 to 21-JUL-17 17:29:00 (CST-6)
Location: CASS LAKE
Magnitude: 56.00 EG
Reported by: Emergency Manager

Trees were blown down on Tract 33.

Flood in ITASCA, MINNESOTA
From 21-JUL-17 17:30:00 to 21-JUL-17 17:30:00 (CST-6)
Location: LA PRAIRIE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Highway 169 was flooded with four to five inches of standing water covering the road.

Thunderstorm Wind in CASS, MINNESOTA
From 21-JUL-17 18:10:00 to 21-JUL-17 18:10:00 (CST-6)
Location: LAKE SHR
Magnitude: 52.00 EG
Reported by: Law Enforcement

Power lines were blown down across Abby Way near the intersection with Interlachen Road.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 21-JUL-17 18:10:00 to 21-JUL-17 18:10:00 (CST-6)
Location: ISLAND LAKE
Magnitude: 56.00 EG
Reported by: Broadcast Media

Several large trees were blown down and a few trees were uprooted. Some of the trees fell on a home.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 21-JUL-17 18:24:00 to 21-JUL-17 18:24:00 (CST-6)
Location: BARTLETT
Magnitude: 56.00 EG
Reported by: Amateur Radio

A home was damaged when a 16 inch diameter tree was blown over by thunderstorm winds. A 20 inch diameter tree was snapped at the base of its trunk by the winds.

Thunderstorm Wind in AITKIN, MINNESOTA
From 21-JUL-17 18:30:00 to 21-JUL-17 18:30:00 (CST-6)
Location: MC GREGOR
Magnitude: 50.00 EG
Reported by: State Official

Several trees were blown down.

Hail in AITKIN, MINNESOTA
From 21-JUL-17 18:35:00 to 21-JUL-17 18:35:00 (CST-6)
Location: HASSMAN
Magnitude: 1.25 
Reported by: Trained Spotter

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 21-JUL-17 20:05:00 to 21-JUL-17 20:05:00 (CST-6)
Location: ARNOLD
Magnitude: 52.00 EG
Reported by: Storm Chaser

Several trees were blown down across a road.