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EF3 tornado in Coconino County, Arizona

Tornado October 6, 2010 · Coconino County, Arizona

EF3
Rating
30.1 mi
Path length
800 yd
Path width
$400K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 800 yards (0.45 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF3 means. On the Enhanced Fujita scale, EF3 is severe damage: whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, consistent with estimated gusts of 136–165 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

This tornado caused extensive forest damage (primarily south of Bellemont), along a discontinuous track which extended from 15 miles south of Bellemont, eventually crossing Hwy 180 northwest of Flagstaff. The path of this tornado was parallel to, and approximately 1 mile west of Tornado #2. Very wide, severe and complete forest damage occurred in the forest south of Bellemont. Tornado visually sighted by NWS staff at the Bellemont Weather Forecast Office.

Tornado passed 1/3 mile west of the NWS Bellemont Weather Forecast office. Additional damage stats include:

-28 rail cars derailed in Bellemont.

-Semi trucks and trailers were overturned on I-40.

-Power poles and numerous trees snapped on Camp Navajo. Some structures damaged.

-Numerous forest roads blocked and campers were stranded by fallen trees.

The wider storm

A strong low pressure center over California pushed abundant moisture over Arizona producing widespread thunderstorms with numerous severe storms. Strong vertical wind shear...with helicity in the 400-450 range...also provided an environment for supercell development. There were eleven confirmed tornadoes on October 6, 2010 across northern Arizona (three of the tornadoes were within 2 miles of the NWS Forecast office). This breaks the old record for the most tornadoes in Arizona for one day. The Arizona Governor signed a declaration of emergency for Coconino Country for $200,000 to be used for emergency response and public infrastructure repair.

Began near Kachina Village (35.0500, -111.8650).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 261973. Narratives are written by the National Weather Service forecast office that issued the report.

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