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EF1 tornado in Glenn County, California

Tornado May 25, 2011 · Glenn County, California

EF1
Rating
26.4 mi
Path length
120 yd
Path width
$150K
Damage as recorded
$400K
Crop damage
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 120 yards (0.07 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF1 means. On the Enhanced Fujita scale, EF1 is moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken, consistent with estimated gusts of 86–110 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

The second tornado of the outbreak developed northeast of downtown Willows in Glenn County at approximately 5:12 pm. It moved east-northeast and passed just south of the town of Durham in Butte County. It caused significant damage to almond groves in Butte County, as well as destroyed one out building, damaged an open barn, and caused roofing damage to two other structures. The rating of an EF1 was based upon the uprooting of thousands of almond trees with many instances of broken large branches and trunks and the physical lifting and carrying of several large trees by five to ten feet. The estimated highest wind speed (3 second gust) based upon damage with this tornado is 105 mph. There were no injuries nor fatalities.

The wider storm

Three tornadoes moved through Glenn and Butte Counties the evening of May 25, 2011. Significant damage was caused to several structures and thousands of almond trees were destroyed.

Began near Willows (39.5200, -122.2000).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 299818. Narratives are written by the National Weather Service forecast office that issued the report.

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