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F4 tornado in Union, Adair, Guthrie and Dallas County, Iowa

Tornado May 27, 1995 · Union, Adair, Guthrie and Dallas County, Iowa

F4
Rating
55.0 mi
Path length
500 yd
Path width
2
Injuries
$3.0M
Damage as recorded
$80K
Crop damage
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 500 yards (0.28 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What F4 means. This tornado was rated on Fujita’s original scale, used until 2007. F4 meant devastating damage: well-built houses levelled; the scale paired it with winds of 207–260 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

Twin vortex tornado.

Began near Creston To (41.0700, -94.4200).

Source: NOAA Storm Events Database, event 10323694. Narratives are written by the National Weather Service forecast office that issued the report.

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