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F4 tornado in Adair County, Iowa

Tornado May 10, 1959 · Adair County, Iowa

Rating

41.1 mi

Path length

400 yd

Path width

Injury

$2.5M

Damage as recorded

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.

NOAA’s online database has no written narrative for tornadoes before 1996 — just the numbers above, transcribed from the original storm logs. Written accounts from this era do exist in NOAA’s monthly Storm Data publications (scanned, back to 1959).

Source: NOAA Storm Events Database, event 10019298. Narratives are written by the National Weather Service forecast office that issued the report.

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