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F4 tornado in Canadian County, Oklahoma

Tornado April 30, 1978 · Canadian County, Oklahoma

Rating

9.3 mi

Whole path

1,760 yd

Path width

$5.0M

Damage as recorded

NOAA records this tornado county by county. Its path ran through Canadian County → Oklahoma County; the totals above are for the whole tornado.

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 1,760 yards (1.00 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 10092281. Narratives are written by the National Weather Service forecast office that issued the report.

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