A strong cold front moved across Arizona with very strong surface winds and blowing dust.  The highest wind speed,  77 MPH,  topped hurricane force and the visibility dropped to below 15 feet in places.  Interstate 40 was closed for nine hours and at least 3 vehicles blew over.

High Wind in LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY, ARIZONA
From 11-MAY-10 06:30:00 to 11-MAY-10 19:00:00 (MST-7)
Magnitude: 67.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two RV trailers and a semi trailer were blown over on I-40 near Two Guns.  The ADOT anemometer near Two Guns had a peak wind gust of 77 MPH at 832 AM MST.

High Wind in LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY, ARIZONA
From 11-MAY-10 12:55:00 to 11-MAY-10 20:55:00 (MST-7)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Petrified Forest National Park reported a peak wind gust of 59 MPH.   Lupton reported a peak wind gust of 62 MPH.

High Wind in CHUSKA MOUNTAINS AND DEFIANCE PLATEAU, ARIZONA
From 11-MAY-10 14:20:00 to 11-MAY-10 15:30:00 (MST-7)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The ADOT anemometer in Lupton reported a peak wind gust of 62 MPH.

Dust Storm in NORTHEAST PLATEAUS AND MESAS SOUTH OF HIGHWAY 264, ARIZONA
From 11-MAY-10 13:30:00 to 11-MAY-10 18:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law Enforcement in Dilkon reported that the visibility was down to 15 feet in blowing dust.

Dust Storm in LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY, ARIZONA
From 11-MAY-10 07:00:00 to 11-MAY-10 16:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Near zero visibility was reported in Leupp at 730 AM then slowly improved through the day.  I-40 was closed for several hours because of the poor visibility in blowing dust.

High Wind in WESTERN MOGOLLON RIM, ARIZONA
From 11-MAY-10 08:00:00 to 11-MAY-10 09:00:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Flagstaff Airport reported a peak wind gust of 59 MPH.

High Wind in LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY, ARIZONA
From 11-MAY-10 16:20:00 to 11-MAY-10 21:00:00 (MST-7)
Magnitude: 57.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A peak wind gust of 58 MPH was recorded by the ASOS at the Winslow Airport.  The winds gusted above 50 MPH for over 5 hours in Winslow.  A spotter 10 miles south of Holbrook reported a peak wind gust of 66 MPH.

High Wind in WHITE MOUNTAINS, ARIZONA
From 11-MAY-10 10:30:00 to 11-MAY-10 22:30:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Show Low Airport reported a peak wind gust of 60 MPH.   The wind gusted above 50 MPH for over 7 hours.

Dust Storm in CHINLE VALLEY, ARIZONA
From 11-MAY-10 10:30:00 to 11-MAY-10 16:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The visibility in Chinle dropped to near zero at times.  The visibility dropped to a mile in the community of Many Farms.

High Wind in EASTERN MOGOLLON RIM, ARIZONA
From 11-MAY-10 10:20:00 to 11-MAY-10 22:20:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Show Low Airport reported a peak wind gust of 60 MPH.   The wind gusted above 50 MPH for over 7 hours.

Dust Storm in LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY, ARIZONA
From 11-MAY-10 09:00:00 to 11-MAY-10 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There was blowing dust most of the day.  The visibility dropped to one half mile around 100 PM.