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Marine Thunderstorm Wind · St. Lawrence River

Marine Thunderstorm Wind August 7, 2021 · St Lawrence River Above Ogdensburg Ny, St. Lawrence River

58 mph

Estimated gust (50 kt)

$1K

Damage as recorded

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

What the National Weather Service wrote

Media reported trees were downed on Grindstone Island in the middle of the St. Lawrence River.

The wider storm

A west to east oriented line of thunderstorms evolved north of ON-401 through the afternoon hours on August 7. This line eventually evolved into a bit of a bowing segment as it took on a more northeast to southwest orientation during the evening hours while crossing the St. Lawrence Valley. This resulted in downed trees on Grindstone Island.

Began near Clayton (44.2800, -76.1200).

Source: NOAA Storm Events Database, event 965357. Narratives are written by the National Weather Service forecast office that issued the report.

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