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Marine Thunderstorm Wind · Lake Superior

Marine Thunderstorm Wind July 1, 2011 · Point Isabelle To Lower Entrance of Portage Canal Mi, Lake Superior

58 mph

Estimated gust (50 kt)

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

What the National Weather Service wrote

The Keweenaw County Sheriff reported numerous trees down in around 40 trees uprooted or snapped off just west of Copper Harbor. The trees ranged in diameter from 6 to 18 inches. Portions of Calumet also sustained tree and some roof damage 10-15 minutes earlier.

The wider storm

A cold front moving through a warm and unstable airmass produced a line of strong to severe thunderstorms across much of Lake Superior from late evening on the 1st into the early morning of the 2nd.

Began near Point Isabelle (47.3400, -87.9400).

Source: NOAA Storm Events Database, event 329635. Narratives are written by the National Weather Service forecast office that issued the report.

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