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 over western Lake Superior during the evening hours. A line of storms that moved along the South Shore produced numerous wind gusts over 40 mph with a peak gust of 62 mph on the Blatnik Bridge in the Twin Ports. The KDLH radar was inoperable for this event but a high level of service was maintained by utilizing the KMPX and KMQT radars and one minute GOES-16 satellite data.

Marine Thunderstorm Wind in LS W OF IN SAXON HBR WI TO GRAND PORTAGE MN BYD 5NM, LAKE SUPERIOR
From 26-JUL-21 19:10:00 to 26-JUL-21 19:10:00 (CST-6)
Location: DULUTH
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

A gust to 40 mph was recorded by the University of Duluth Minnesota McQuade offshore buoy 45028.

Marine Thunderstorm Wind in DULUTH MN TO PT WING WI, LAKE SUPERIOR
From 26-JUL-21 19:18:00 to 26-JUL-21 19:18:00 (CST-6)
Location: DULUTH CANAL PARK STATION DULM5
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The National Ocean Service's Water Level Observation Network station DULM5 recorded a gust to 51 mph during the storm.

Marine Thunderstorm Wind in CHEQUAMEGON BAY BAYFIELD TO OAK PT WI, LAKE SUPERIOR
From 26-JUL-21 19:46:00 to 26-JUL-21 21:03:00 (CST-6)
Location: BAYFIELD
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

CWOP Station DW6222 at the Madeline Island Ferry Dock recorded a gust of 43 mph.

Marine Thunderstorm Wind in DULUTH MN TO PT WING WI, LAKE SUPERIOR
From 26-JUL-21 19:12:00 to 26-JUL-21 19:12:00 (CST-6)
Location: SKY HARBOR AIRPORT
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A gust of 39 mph was recorded by the MnDOT RWIS station MN095 at the south end of the Blatnik Bridge.

Marine Thunderstorm Wind in DULUTH MN TO PT WING WI, LAKE SUPERIOR
From 26-JUL-21 19:15:00 to 26-JUL-21 19:15:00 (CST-6)
Location: SKY HARBOR AIRPORT
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

AWOS station KDYT at the Duluth Sky Harbor Airport recorded a gust of 43 mph during the storm.

Marine Thunderstorm Wind in DULUTH MN TO PT WING WI, LAKE SUPERIOR
From 26-JUL-21 19:11:00 to 26-JUL-21 19:11:00 (CST-6)
Location: DULUTH CANAL PARK STATION DULM5
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A gust of 62 mph was recorded by the MnDOT RWIS station MN081 just south of the main span of the Blatnik Bridge over the St. Louis River.

Marine Thunderstorm Wind in CHEQUAMEGON BAY BAYFIELD TO OAK PT WI, LAKE SUPERIOR
From 26-JUL-21 20:03:00 to 26-JUL-21 20:03:00 (CST-6)
Location: BAYFIELD
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

CWOP Station DW6222 at the Madeline Island Ferry Dock recorded a peak gust of 48 mph with the line of storms.

Marine Thunderstorm Wind in SAND IS TO BAYFIELD WI, LAKE SUPERIOR
From 26-JUL-21 19:55:00 to 26-JUL-21 19:55:00 (CST-6)
Location: BASS ISLAND RAWS STATION APOW3
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

AWOS station K4R5 at the La Pointe Airport recoded a gust of 41 mph during the storm.