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F1 tornado in Johnson County, Iowa

Tornado April 13, 2006 · Johnson County, Iowa

Rating

9.4 mi

Whole path

440 yd

Path width

Death

Injury

$125K

Damage as recorded

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

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The path drawn at its surveyed width of 440 yards (0.25 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What F1 means. This tornado was rated on Fujita’s original scale, used until 2007. F1 meant moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken; the scale paired it with winds of 73–112 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

crossed into Muscatine county

The wider storm

Tornado developed 4.1 miles southeast of Lone Tree at 1945 CST and moved east southeast for 0.5 miles before crossing into Muscatine County at 1946 CST. The tornado continued east southeast in Muscatine County before turning left and dissipating southeast of Adams at 2002 CST. While in Johnson County tree and outbuilding damage was noted.

Began near Lone Tree (41.4333, -91.3833).

Source: NOAA Storm Events Database, event 5502568. Narratives are written by the National Weather Service forecast office that issued the report.

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