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EF1 tornado in Coconino County, Arizona

Tornado October 6, 2010 · Coconino County, Arizona

EF1
Rating
0.7 mi
Path length
100 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 100 yards (0.06 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

This tornado was determined via aerial photography and surveys, correlated with the tornadic radar signatures. The start and stop times were estimated from the radar data.

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 Chalender (35.1080, -111.9650).

Other tornadoes from the same storm system

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

EF3 Coconino CountyEF3 Coconino CountyEF2 Coconino CountyEF2 Coconino CountyEF2 Coconino CountyEF2 Coconino CountyEF1 Coconino CountyEF0 Yavapai CountyEF0 Coconino CountyEF0 Coconino County

Source: NOAA Storm Events Database, event 885163. Narratives are written by the National Weather Service forecast office that issued the report.

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