The end of 2018 saw the arrival of a strong cutoff low pressure system into the southern Great Basin. While the northern portion of the trough produced light snowfall over the northern mountains, the cutoff low produced moderate to heavy snowfall over the San Juan Mountains and the southern valleys. Moderate snow also fell in the central mountains and valleys.

Heavy Snow in CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN, COLORADO
From 31-DEC-18 02:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Generally 4 to 8 inches of snow fell across the area.

Heavy Snow in SOUTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 31-DEC-18 03:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Generally 10 to 22 inches of snow fell across the area. Both the Vallecito and Weminche Creek SNOTEL sites estimated 30 inches of storm total snow.

Heavy Snow in ANIMAS RIVER BASIN, COLORADO
From 31-DEC-18 03:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Generally 5 to 10 inches of snow fell across the area with up to 14 inches reported 5 miles east-southeast of Hesperus.

Winter Weather in WEST ELK AND SAWATCH MOUNTAINS, COLORADO
From 31-DEC-18 06:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Generally 5 to 12 inches of snow fell across the area.

Winter Weather in UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE, COLORADO
From 31-DEC-18 08:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Roughly 12 inches of snow fell at the Columbine Pass SNOTEL site with 5.4 inches reported 8 miles west-southwest of Ridgway.

Heavy Snow in SAN JUAN RIVER BASIN, COLORADO
From 31-DEC-18 03:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow amounts of 14 to 14.5 inches were reported in the Pagosa Springs area with up to 24 inches measured 3 miles east-northeast of Chimney Rock.

Winter Weather in NORTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 31-DEC-18 03:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Generally 6 to 12 inches of snow fell across the area with 14 inches reported at the Slumgullion SNOTEL site.

Winter Weather in PARADOX VALLEY / LOWER DOLORES RIVER BASIN, COLORADO
From 31-DEC-18 02:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall amounts ranged from 2 to 6 inches across the area with 7 inches measured at Redvale.

Winter Weather in GRAND VALLEY, COLORADO
From 31-DEC-18 00:00:00 to 31-DEC-18 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Generally 2 to 5 inches of snow fell across the Grand Valley.

Winter Weather in FOUR CORNERS / UPPER DOLORES RIVER BASIN, COLORADO
From 31-DEC-18 04:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Generally 3 to 6 inches of snow fell across the area with 7 inches measured at Mesa Verde National Park.

Winter Weather in GRAND AND BATTLEMENT MESAS, COLORADO
From 31-DEC-18 00:00:00 to 31-DEC-18 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Generally 4 to 8 inches of snow fell across the area.