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Marine Thunderstorm Wind · Lake Superior

Marine Thunderstorm Wind August 19, 2011 · Black River To Ontonagon Mi, Lake Superior

69 mph

Estimated gust (60 kt)

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

What the National Weather Service wrote

The spotter at the headquarters of Porcupine Mountains State Park reported severe downdrafts, trees falling and dime-sized hail.

The wider storm

A deep low pressure system moving through northwest Ontario pushed a warm front across the Upper Great Lakes region on the morning of the 19th. This warm front produced strong to severe thunderstorms over western Lake Superior.

Began near Union Bay Beach (46.8187, -89.6234).

Source: NOAA Storm Events Database, event 343681. Narratives are written by the National Weather Service forecast office that issued the report.

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