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F3 tornado in Duchesne County, Utah

Tornado August 11, 1993 · Duchesne County, Utah

F3
Rating
17.0 mi
Path length
880 yd
Path width
$50K
Damage as recorded
What F3 means. This tornado was rated on Fujita’s original scale, used until 2007. F3 meant severe damage: whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned; the scale paired it with winds of 158–206 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.

What the National Weather Service wrote

Thunderstorms that developed over the northeast portion of Utah produced a high elevation tornado, large hail, and microburst winds. The tornado occurred in the extreme eastern portion of the county in the Ashley National Forest. The tornado moved from southwest to northeast, touched down three times, and the path width was up to a half mile. The tornado damaged around 1,000 acres of trees. Most of the trees were uprooted, but some up to 18 inches in diameter were snapped. Twenty acres was damaged in the first touchdown, around 600 acres in the second, and near 400 acres in the third. The damage pattern of the trees in the area of the second touchdown confirmed the presence of a tornado. Trees on the north side of the path were thrown south, and the ones on the south side were thrown north. A troop of 125 scouts was camped near the area of the third touchdown. No one was injured, but four vehicles were damaged by the uprooted trees. This accounted for all of the damage. The camp also experienced the 1.00-inch-diameter hail at this time. The highest elevation the damage was found at was 10,800 feet.

Source: NOAA Storm Events Database, event 10355131. Narratives are written by the National Weather Service forecast office that issued the report.

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