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EF0 tornado in Lake County, Montana

Tornado September 1, 2011 · Lake County, Montana

EF0

Rating

0.7 mi

Path length

3 yd

Path width

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The path drawn at its surveyed width of 3 yards (0.00 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF0 means. On the Enhanced Fujita scale, EF0 is light damage: shingles and siding peeled, gutters torn, branches broken, consistent with estimated gusts of 65–85 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

A waterspout formed over Skidoo Bay and remained over water. No damage was reported.

The wider storm

An upper level trough moved over northwest Montana with very cold air aloft. This interacted with the warmer and moist air over Flathead Lake to produce some cumulonimbus clouds. A waterspout extended out of one of these clouds over Skidoo Bay.

Began near Polson Arpt (47.7763, -114.0422).

Source: NOAA Storm Events Database, event 346528. Narratives are written by the National Weather Service forecast office that issued the report.

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