A Pacific trough developed into an upper low over eastern Utah and western Colorado which produced significant snowfall in most mountains and some lower elevation areas of western Colorado.

Winter Weather in FLATTOP MOUNTAINS, COLORADO
From 21-DEC-11 11:00:00 to 22-DEC-11 08:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Snowfall ranged from 5 to 12 inches across the area. Wind gusts of 20 to 30 mph  produced localized blowing and drifting snow.

Winter Weather in DEBEQUE TO SILT CORRIDOR, COLORADO
From 22-DEC-11 03:00:00 to 22-DEC-11 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall ranged from 2 to 4 inches across the area.

Winter Weather in GRAND AND BATTLEMENT MESAS, COLORADO
From 21-DEC-11 16:00:00 to 22-DEC-11 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall ranged from 7 to 12 inches across the area. Locally higher amounts included 13 inches at Powderhorn Ski Area.

Winter Weather in GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS, COLORADO
From 21-DEC-11 14:00:00 to 22-DEC-11 08:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall ranged from 3 to 8 inches across the area. Wind gusts of 20 to 30 mph produced localized blowing and drifting snow.

Winter Weather in UPPER GUNNISON RIVER VALLEY, COLORADO
From 22-DEC-11 00:00:00 to 22-DEC-11 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall ranged from 3 to 6 inches across the western portion of the area.

Winter Weather in NORTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 21-DEC-11 17:00:00 to 22-DEC-11 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall ranged from 5 to 7 inches across the area. Wind gusts of 25 to 45 mph produced areas of blowing and drifting snow.

Winter Weather in UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE, COLORADO
From 21-DEC-11 15:00:00 to 22-DEC-11 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall ranged from 3 to 10 inches across the area.

Winter Weather in CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN, COLORADO
From 21-DEC-11 21:00:00 to 22-DEC-11 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall ranged from 3 to 6 inches across the area.

Winter Weather in SOUTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 22-DEC-11 01:00:00 to 22-DEC-11 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall ranged from 3 to 7 inches across the area. Wind gusts of 25 to 50 mph produced areas of blowing and drifting snow.

Winter Weather in PARADOX VALLEY / LOWER DOLORES RIVER BASIN, COLORADO
From 22-DEC-11 00:00:00 to 22-DEC-11 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Snowfall ranged from 3 to 6 inches across the area.

Winter Weather in GRAND VALLEY, COLORADO
From 22-DEC-11 02:00:00 to 22-DEC-11 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This was the first significant snowfall of the season in the Grand Valley, with snowfall accumulations that ranged from 1 to 4 inches.  The slick roads resulted in numerous vehicle accidents.

Winter Weather in ELKHEAD AND PARK MOUNTAINS, COLORADO
From 21-DEC-11 06:00:00 to 22-DEC-11 04:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall ranged from 4 to 10 inches across the area.  Wind gusts of 25 to 50 mph produced areas of blowing and drifting snow.

Winter Weather in WEST ELK AND SAWATCH MOUNTAINS, COLORADO
From 21-DEC-11 17:00:00 to 22-DEC-11 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall ranged from 4 to 8 inches across about half of the area. Wind gusts of 30 to 50 mph produced areas of blowing and drifting snow.