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Marine Thunderstorm Wind · Lake Superior

Marine Thunderstorm Wind August 9, 2025 · St Marys River From Point Iroquois To E Potagannissing Bay, Lake Superior

40 mph

Measured gust (35 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Gust to 40mph at MDOT site near Dafter, MI.

The wider storm

Very hot weather continued. Upstream convection tracked into the region in the evening, decaying quickly with eastward extent, but did result in some gusty winds at the northwest Lower MI lakeshore and across parts of the EUP.

Began near Brimley (46.3700, -84.4300).

Source: NOAA Storm Events Database, event 1297451. Narratives are written by the National Weather Service forecast office that issued the report.

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