Lake Superior, 2025

Marine Thunderstorm Winds in Lake Superior, August 22, 2025

August 22, 2025 · NWS DLH · 5 events in 4 counties and zones

An area of storms moved across northwestern Wisconsin and along the South Shore of Lake Superior during the afternoon hours of the 22nd. In addition to some small hail, these storms produced wind gusts to around 45 mph near the shore.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
5

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS DLH wrote it up.

An area of storms moved across northwestern Wisconsin and along the South Shore of Lake Superior during the afternoon hours of the 22nd. In addition to some small hail, these storms produced wind gusts to around 45 mph near the shore. Over the open waters of western Lake Superior off the Apostle Islands, a gust to 62 mph was recorded by an iron ore hauling vessel.

The radar

The Duluth radar (KDLH), 10 km away, was scanning. The volume nearest the first event began at 02:24 UTC.

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Event by event

4 marine thunderstorm wind, 1 marine hail. Local standard time, as filed.

Marine Thunderstorm Wind, Duluth Mn to Pt Wing Wi

When
August 22, 8:25 PM CST
Where
Duluth Mn to Pt Wing Wi forecast zone, 1.43 mi WSW of Duluth Canal Park Station Dulm5
Measured
39 kt (45 mph) measured gust
Reported by
Department of Highways
Coordinates
46.770, -92.117

A gust of 45 mph was recorded at MnDOT mesonet station MN082 I-35 - Garfield Ave - MP 255.

Marine Thunderstorm Wind, Duluth Mn to Pt Wing Wi

When
August 22, 8:35 PM CST
Where
Duluth Mn to Pt Wing Wi forecast zone, Sky Harbor Airport
Measured
36 kt (41 mph) measured gust
Reported by
AWOS
Coordinates
46.720, -92.040

A gust of 41 mph was recorded by the AWOS station KDYT Duluth Sky Harbor Airport.

Marine Thunderstorm Wind, Pt Wing to Sand Is Wi

When
August 22, 9:20 PM CST
Where
Pt Wing to Sand Is Wi forecast zone, Port Wing Station Pngw3
Measured
40 kt (46 mph) measured gust
Reported by
Mesonet
Coordinates
46.790, -91.390

A gust to 46 mph was recorded by the mesonet station PNGW3 one mile north of Port Wing.

Marine Thunderstorm Wind, Ls W of in Saxon Hbr Wi to Grand Portage Mn Byd 5nm

When
August 22, 9:28 PM CST
Where
Ls W of in Saxon Hbr Wi to Grand Portage Mn Byd 5nm forecast zone, 28.05 mi NE of Sand Island
Measured
54 kt (62 mph) measured gust
Reported by
Mariner
Coordinates
47.230, -90.480

A gust to 62 mph was recorded by the P/T Dirk S. VanEnkevort.

Marine Hail, Chequamegon Bay Bayfield to Oak Pt Wi

When
August 22, 9:33 PM CST to 9:35 PM CST
Where
Chequamegon Bay Bayfield to Oak Pt Wi forecast zone, 16.23 mi SSW of Bayfield
Measured
0.75 in hail
Reported by
Public
Coordinates
46.590, -90.890

What these are

Marine Thunderstorm Wind
Thunderstorm winds of 34 knots or more over coastal or lake waters.
Marine Hail
Hail three-quarters of an inch or larger over water.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Lake Superior in 2025Every state in 2025This day in weather history

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1290434, 1290447, 1290450, 1290461, 1290463.