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Marine Thunderstorm Wind · Lake Superior

Marine Thunderstorm Wind September 3, 2017 · Sand Is To Bayfield Wi, Lake Superior

46 mph

Estimated gust (40 kt)

$10K

Damage as recorded

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

What the National Weather Service wrote

Moored boats were severely damaged as thunderstorm winds pushed them into the shoreline.

The wider storm

Strong thunderstorm-induced winds and waves battered the shorelines of Sand, Rocky and Outer Islands of the Apostle Islands. The winds and waves damaged moored boats by pushing the boats into shore. Two of the eight vessels involved had to be towed back to the mainland and one was partially sunk.

Began near Sand Island (46.9796, -90.9346).

Source: NOAA Storm Events Database, event 721132. Narratives are written by the National Weather Service forecast office that issued the report.

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