Multiple rounds of storms were observed across northeastern Minnesota the afternoon of the 23rd into the early morning hours of the 24th. The first round developed in association with a warm front during the afternoon hours of the 23rd and produced damaging wind gusts leading to downed trees and power lines. The second round developed during the early morning hours of the 24th and led to a few isolated reports of tree damage and a measured gust to 62 mph at the Duluth Airport.

Thunderstorm Wind in ITASCA, MINNESOTA
From 23-JUL-21 16:48:00 to 23-JUL-21 16:48:00 (CST-6)
Location: BASS LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A report was received via mPING of trees uprooted or snapped.

Thunderstorm Wind in AITKIN, MINNESOTA
From 24-JUL-21 02:46:00 to 24-JUL-21 02:47:00 (CST-6)
Location: SHOVEL LAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A large tree was down along State Highway 200 approximately 6 miles west of Hill City.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 24-JUL-21 04:04:00 to 24-JUL-21 04:05:00 (CST-6)
Location: (DLH)DULUTH INTL ARP
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A tree branch about a foot in diameter was snapped off an ash tree at the NWS office.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 24-JUL-21 04:06:00 to 24-JUL-21 04:06:00 (CST-6)
Location: DULUTH INTL ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A gust to 64 mph was measured with the storm at the KDLH ASOS station at the Duluth International Airport.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 24-JUL-21 04:10:00 to 24-JUL-21 04:11:00 (CST-6)
Location: DULUTH HGTS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large trees were down along Arrowhead Road east of the Rice Lake Road intersection.

Thunderstorm Wind in KOOCHICHING, MINNESOTA
From 23-JUL-21 15:30:00 to 23-JUL-21 15:31:00 (CST-6)
Location: (INL)INTL FALLS ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down on a power line along County Road 2 near the International Falls Airport.

Thunderstorm Wind in ITASCA, MINNESOTA
From 23-JUL-21 16:30:00 to 23-JUL-21 16:31:00 (CST-6)
Location: ALVWOOD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported a tree down on power lines about two miles west of the their home.

Thunderstorm Wind in ITASCA, MINNESOTA
From 23-JUL-21 16:39:00 to 23-JUL-21 16:40:00 (CST-6)
Location: DORA LAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few trees were downed at the spotter's location and the power was out.

Thunderstorm Wind in ITASCA, MINNESOTA
From 23-JUL-21 16:50:00 to 23-JUL-21 16:51:00 (CST-6)
Location: MAX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photos were received showing an uprooted red pine tree along with a with pine that was broken about halfway up. The trees were estimated to be about 80 feet tall.

Thunderstorm Wind in ITASCA, MINNESOTA
From 23-JUL-21 17:15:00 to 23-JUL-21 17:16:00 (CST-6)
Location: INGER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photos were received showing several large aspen trees that were downed by the storm.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 23-JUL-21 17:41:00 to 23-JUL-21 17:42:00 (CST-6)
Location: VERMILLION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Multiple canoes were flipped over from thunderstorm wind gusts on Trout Lake. The occupants of one canoe unaccounted for at the time of the report. There were later found safe. Additional water emergencies were ongoing in other portions of the Boundary Waters Canoe Area Wilderness due to the storm.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 23-JUL-21 17:47:00 to 23-JUL-21 17:48:00 (CST-6)
Location: ELY
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Photos and measurements were received of the downed trees in Whiteside Park. The two largest trees were elms with one uprooted that was 1 foot in diameter with the second being 27 inches in diameter and was completely snapped about 8 feet up. The Blueberry/Arts Fest was ongoing in the park at the time of the storm and the storm caused significant damage to temporary tents and booths along with the items for sale in the tents/booths. The remainder of the festival was subsequently canceled due to the damage.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 23-JUL-21 17:46:00 to 23-JUL-21 17:47:00 (CST-6)
Location: ELY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous reports were received of downed trees and blocked streets in Ely from the storm.

Thunderstorm Wind in LAKE, MINNESOTA
From 23-JUL-21 18:45:00 to 23-JUL-21 18:46:00 (CST-6)
Location: ISABELLA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down on power lines along Mitawan Lake Road northwest of Isabella.

Thunderstorm Wind in AITKIN, MINNESOTA
From 23-JUL-21 19:31:00 to 23-JUL-21 19:32:00 (CST-6)
Location: HILL CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Multiple downed trees were observed along Minnesota Highway 200 east of Hill City.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 23-JUL-21 19:40:00 to 23-JUL-21 19:41:00 (CST-6)
Location: CULVER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two trees were reported down north of County Highway 8 along Highway 7.

Thunderstorm Wind in ST. LOUIS, MINNESOTA
From 23-JUL-21 19:42:00 to 23-JUL-21 19:43:00 (CST-6)
Location: CULVER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Three trees were downed one mile south of County Highway 8 along County Highway 7 with one tree completely blocking the road.