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.

Hail in APACHE, ARIZONA
From 06-OCT-10 14:05:00 to 06-OCT-10 14:15:00 (MST-7)
Location: TEEC NOS POS ARPT
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Golf ball sized (1.75 inches in diameter) knocked out several windshields on Highway 160 and in Four Corners National Monument.

Hail in YAVAPAI, ARIZONA
From 06-OCT-10 11:00:00 to 06-OCT-10 11:00:00 (MST-7)
Location: CORNVILLE
Magnitude: 2.00 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two inch diameter hail fell in Corneville with minor damage to vehicles.

Thunderstorm Wind in COCONINO, ARIZONA
From 06-OCT-10 05:15:00 to 06-OCT-10 05:15:00 (MST-7)
Location: BELLEMONT
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Siding was blown off houses and into cars.  At least two trees were blown down.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 04:55:00 to 06-OCT-10 05:02:00 (MST-7)
Location: SEDONA ARPT
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Strong tornado in the forest south of Bellemont. Two forest roads were completely blocked by fallen trees, with several areas along the path exhibiting complete destruction of the forest with all trees felled for hundreds of yards. The supercell thunderstorm that produced this tornado also produced Tornado #3.

Funnel Cloud in YAVAPAI, ARIZONA
From 06-OCT-10 11:42:00 to 06-OCT-10 11:42:00 (MST-7)
Location: MAYER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A funnel cloud was reported west of I-17 by a motorist traveling on the interstate.

Hail in YAVAPAI, ARIZONA
From 06-OCT-10 04:30:00 to 06-OCT-10 04:45:00 (MST-7)
Location: CORNVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced hail across Cornville that ranged from quarter to golf ball sized (1 to 1.75 inches in diameter).

Tornado in COCONINO, ARIZONA
From 06-OCT-10 08:29:00 to 06-OCT-10 08:33:00 (MST-7)
Location: CHALENDER
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

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.

Hail in COCONINO, ARIZONA
From 06-OCT-10 06:00:00 to 06-OCT-10 06:00:00 (MST-7)
Location: INDIAN VLG
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Baseball sized (2.75 inch diameter) hail fell about 11 miles south of Bellemont.

Hail in COCONINO, ARIZONA
From 06-OCT-10 08:50:00 to 06-OCT-10 08:55:00 (MST-7)
Location: PARKS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball sized (1.75 inches in diameter) fell in Parks.

Hail in YAVAPAI, ARIZONA
From 06-OCT-10 09:05:00 to 06-OCT-10 09:10:00 (MST-7)
Location: CLEMENCEAU
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One inch diameter hail fell in Cottonwood.

Hail in YAVAPAI, ARIZONA
From 06-OCT-10 09:30:00 to 06-OCT-10 09:30:00 (MST-7)
Location: BEAVER CREEK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail 1.75 inch in diameter fell around mile post 312 on Interstate 17 or about 11 miles south of Munds Park.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 12:20:00 to 06-OCT-10 12:25:00 (MST-7)
Location: DONEY PARK
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado was observed 4 miles south of the Country Club neighborhood on the east side of Flagstaff.  Little damage reported.

Hail in YAVAPAI, ARIZONA
From 06-OCT-10 11:30:00 to 06-OCT-10 11:30:00 (MST-7)
Location: RIMROCK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

A thunderstorm produced 1.25 inch diameter hail.  The  trail at Lake Montezuma was closed due to the hail.

Hail in COCONINO, ARIZONA
From 06-OCT-10 11:30:00 to 06-OCT-10 11:30:00 (MST-7)
Location: MUNDS PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One inch diameter hail covered the ground in Munds Park.

Hail in COCONINO, ARIZONA
From 06-OCT-10 12:14:00 to 06-OCT-10 12:14:00 (MST-7)
Location: MOUNTAINAIRE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One inch diameter hail fell about two miles south of Mountainaire with heavy rain.

Hail in COCONINO, ARIZONA
From 06-OCT-10 11:30:00 to 06-OCT-10 11:30:00 (MST-7)
Location: KACHINA VILLAGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

One inch diameter hail fell in Kachina Village.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 01:50:00 to 06-OCT-10 02:12:00 (MST-7)
Location: CLINTS WELL
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

The US Forest Service and NWS reported significant tornado damage near Blue Ridge Ranger Station and NWS Radar site. Hundreds of ponderosa pines were blown over or snapped off along a 14.8 mile path. At least one alligator juniper that was 2 and a half feet in diameter was snapped off.  Trees were down across Highway 87 between mile markers 296 and 298.  NWS Storm Surveys and aerial surveys contributed to the event analysis.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 05:07:00 to 06-OCT-10 05:44:00 (MST-7)
Location: BELLEMONT
Tornado F-scale: EF2
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

Considerable structural damage in and around the community of Bellemont; significant forest damage and treefall in forest north and south of Bellemont. This tornado was from the same storm that produced Tornado #2.  Aerial and ground surveys verified a semi-continuous tornado path from 8 miles south of Bellemont, extending northward for 26 miles, crossing Interstate 40 and Highway 180 (three times- near mileposts 230, 234, and 240). Tornado passed 2/3 mile east of the NWS Bellemont Weather Forecast office. Damage from this tornado included:
-7 minor injuries.
-Over 100 homes damaged in Bellemont, 21 homes sustaining significant damage (deemed uninhabitable).
-At least one business (RV Sales) with damage with 30+ RV units demolished and tossed onto Interstate 40. Interstate closed for several hours.
-At least one overturned truck on the Interstate.
-Numerous forest roads blocked, campers stranded by fallen trees.
-Around 75 power poles knocked down.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 05:54:00 to 06-OCT-10 06:50:00 (MST-7)
Location: KACHINA VILLAGE
Tornado F-scale: EF3
Property damage: 400.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

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.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 06:50:00 to 06-OCT-10 07:14:00 (MST-7)
Location: SEDONA ARPT
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Garjon Tank Tornado (6:50 - 7:14 AM MST): This tornado caused extensive forest damage south of Bellemont, blocking several forest roads. Path of tornado was parallel to, and 1-2 miles west of the paths of Tornado #2 and Tornado #4.  There was some evidence of tornadic cycling with three individual tornadoes possible. Tornado passed 2 miles west of the National Weather Service Office as it dissipated.  Aerial surveys and imagery were also used in the analysis.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 09:10:00 to 06-OCT-10 09:15:00 (MST-7)
Location: SEDONA ARPT
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Short path of significant tornado damage between two other tracks near the Mogollon Rim.  Aerial imagery was also used in the analysis.  Start and end times estimated from radar data.

Tornado in YAVAPAI, ARIZONA
From 06-OCT-10 10:30:00 to 06-OCT-10 10:35:00 (MST-7)
Location: BUMBLE BEE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A 50-yard wide tornado was observed in grassland east of Interstate 17. Dissipated shortly afterward.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 11:15:00 to 06-OCT-10 11:20:00 (MST-7)
Location: MOENKOPI
Tornado F-scale: EF3
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Utility Company

A tornado collapsed three 500 KV electrical transmission towers. The towers were of metal truss construction. One tower was completely flattened. Photographic evidence and first-hand reports were provided by Arizona Public Service. Tornado damage intensity is rated at EF-3. Damage path length indeterminable.

Tornado in COCONINO, ARIZONA
From 06-OCT-10 12:10:00 to 06-OCT-10 12:20:00 (MST-7)
Location: MUNDS PARK
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Munds Park / Cosnino tornado (12:05 - 12:20 PM): This tornado was seen crossing Interstate 17 moving northbound.