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EF3 tornado in Carter County, Montana

Tornado June 17, 2014 · Carter County, Montana

EF3
Rating
10.0 mi
Path length
880 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 880 yards (0.50 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF3 means. On the Enhanced Fujita scale, EF3 is severe damage: whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, consistent with estimated gusts of 136–165 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 supercell thunderstorm developed very quickly in Eastern Carter County around 2:15 pm. The thunderstorm produced the first ever EF-3 rated tornado in southern Montana. The tornado first touched down at 2:27 pm around 13 miles southwest of Camp Crook, South Dakota, or about 10 miles southwest of Capitol, Montana. The tornado formed in the Sheep Mountains and eventually crossed Tie Creek Road as it moved slowly north. People lost site of the tornado as it entered Custer National Forest around 3:30 pm.

The tornado was on the ground for an hour and traveled 10 miles and was reported to be a half mile wide at times. The tornado completely destroyed a trailer home, twisting and throwing debris over a mile. A small and old A-frame school house was completely destroyed, with debris blown 100 yards away, leaving only the basement behind. Six vehicles were picked up and tossed up to 200 yards. Around 20 power poles were snapped off with one pulled up out of the ground. In addition, 20 hay bales, weighing 3/4 ton a piece, were blown so far away that they were not recovered. A swath of trees on the north end of the track into the Custer National Forest was flattened by the tornado. There were no injuries or deaths from the tornado but two horses were killed.

This was the strongest tornado ever recorded in the Billings National Weather Service area of responsibility.

The wider storm

A supercell thunderstorm produced a long-lived tornado across parts of East Central Carter County during the afternoon of June 17th. Eye-witnesses reported that the tornado was on the ground for approximately one hour.

Began near Capitol (45.4783, -104.1832).

Source: NOAA Storm Events Database, event 515637. Narratives are written by the National Weather Service forecast office that issued the report.

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