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F1 tornado in Cooper County, Missouri

Tornado April 8, 1999 · Cooper County, Missouri

Rating

4.0 mi

Path length

75 yd

Path width

$750K

Damage as recorded

$50K

Crop damage

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The path drawn at its surveyed width of 75 yards (0.04 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 developed 4 miles south of Boonville and moved quickly northeast, damaging a church and downing several trees and power poles 4 miles south of Boonville. Three eighteen-wheelers were overturned.

The wider storm

Severe weather broke out in northwest and west-central Missouri around midday on April 8. Storms tracked rapidly northeastward and moved into central and north-central Missouri by early evening. The outbreak included at least five tornadoes, one of which moved along a 54-mile path across three counties. Reports of thunderstorm wind damage were also widespread throughout the area.

Began near Boonville (38.9000, -92.7300).

Other tornadoes from the same storm system

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

F2 Carroll County F2 Macon County F1 Andrew County F1 Livingston County

Source: NOAA Storm Events Database, event 5691930. Narratives are written by the National Weather Service forecast office that issued the report.

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