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F1 tornado in Hendricks County, Indiana

Tornado April 20, 2004 · Hendricks County, Indiana

F1
Rating
0.1 mi
Path length
50 yd
Path width
$150K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 50 yards (0.03 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

A tornado associated with a low-topped supercell touched down a quarter of a mile south of the Boone/Hendricks county line in Hendricks county. The tornado continued northeast through Jamestown and into Boone county causing significant damage to a dozen homes. 2 homes had their roofs blown completely off and tossed several hundred feet into a corn field. There were 8 minor injuries including one man whose semi was blown over along Interstate 74. Estimated wind speeds were around 110 mph or on the high end of an F1 rating.

The wider storm

3 low-topped supercell thunderstorms dropped down at least 1 tornado a piece and a total of 6 tornadoes across Central Indiana during the late afternoon and early evening of April 20. All of the tornadoes were F0 or F1 in rating. The worst damage occurred in Kokomo as 3 homes were damaged and a skating rink and trucking company had significant damage totaling around 3 million dollars. There were also 1 minor injury. The town of Jamestown along the Hendricks/Boone county border also was hit hard with significant damage to a dozen homes totaling 1.65 million dollars. There were also 8 minor injuries, 1 as a result of his semi being overturned along Interstate 74.

Began near North Salem (40.2667, -86.4333).

Other tornadoes from the same storm system

6 more tornadoes the National Weather Service filed under this storm episode.

Source: NOAA Storm Events Database, event 5392896. Narratives are written by the National Weather Service forecast office that issued the report.

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