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F1 tornado in Roosevelt County, Montana

Tornado July 21, 1999 · Roosevelt County, Montana

F1
Rating
1.0 mi
Path length
30 yd
Path width
$20K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

NOAA recorded where this tornado touched down but not where it lifted, so it appears as a point. Other tornadoes recorded nearby that day are shown faint.

What F1 means. This tornado was rated on Fujita’s original scale, used until 2007. F1 meant moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken; the scale paired it with winds of 73–112 mph, figures later judged too high, especially toward the top of the scale, and revised downward in the Enhanced Fujita scale. Ratings then, as now, came from the damage.

The wider storm

Two supercell thunderstorms moved across northeast Montana causing a path of damage that extended from southern Phillips county to the North Dakota border. The hardest hit was the community of Glasgow where 4.5 inch hail fell damaging cars, roofs, windows and trees as it passed. The largest hail fell from downtown Glasgow near the courthouse northeast to the local Ford dealership. The storms continued east where they produced at least two tornado touchdowns in rural areas. Large hail continued to be reported along the Highway 2 corridor. A tornado touchdown was reported in Bainville where railroad cars were blown off of the tracks.

Began near Bainville (48.1300, -104.2200).

Other tornadoes from the same storm system

1 more tornado the National Weather Service filed under this storm episode.

F0 Roosevelt County

Source: NOAA Storm Events Database, event 5702787. Narratives are written by the National Weather Service forecast office that issued the report.

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