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F4 tornado in Carroll, Sac, Calhoun and Pocahontas County, Iowa

Tornado May 27, 1995 · Carroll, Sac, Calhoun and Pocahontas County, Iowa

Rating

37.0 mi

Path length

400 yd

Path width

$3.0M

Damage as recorded

$43K

Crop damage

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 400 yards (0.23 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

Multiple vortex at times.

Began near Carroll To (42.0700, -94.9000).

Source: NOAA Storm Events Database, event 10321424. Narratives are written by the National Weather Service forecast office that issued the report.

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