The progression and eventual merging of two weather disturbances across western Colorado combined with a strong polar and sub-tropical jet to produce significant to heavy snowfall across most Colorado mountains and some higher valley locations. Snowfall began over the higher terrain on the evening of Wednesday, February 14th before increasing in coverage and continuing through the night of Thursday, February 15th. The heaviest snowfall fell Thursday morning and early Thursday afternoon. The support of the two upper level jets overhead enhanced snowfall rates and allowed gusty winds to mix down to the surface which resulted in periods of reduced visibility in blowing snow.

Winter Weather in UPPER YAMPA RIVER BASIN, COLORADO
From 15-FEB-18 02:00:00 to 15-FEB-18 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall totals ranged from 2 to 5 inches across the area.  Locally higher amounts up to 8 inches were measured in the Steamboat Springs area.

Winter Weather in SOUTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 14-FEB-18 17:00:00 to 15-FEB-18 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall totals ranged from 5 to 10 inches across the area.  Locally higher amounts included 15 inches at the Sharkstooth and Spud Mountain SNOTEL sites.

Winter Weather in SAN JUAN RIVER BASIN, COLORADO
From 14-FEB-18 17:00:00 to 15-FEB-18 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall totals ranged from 3 to 6 inches across the area.

Winter Weather in NORTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 14-FEB-18 18:00:00 to 15-FEB-18 18:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall totals generally ranged from 5 to 10 inches across the area.

Winter Weather in WEST ELK AND SAWATCH MOUNTAINS, COLORADO
From 14-FEB-18 20:00:00 to 15-FEB-18 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall totals ranged from 5 to 10 inches.  Locally higher amounts included 18 inches and 27 inches at the North Lost Trail and Schofield Pass SNOTEL sites, respectively.

Winter Storm in ELKHEAD AND PARK MOUNTAINS, COLORADO
From 14-FEB-18 21:00:00 to 16-FEB-18 00:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread snowfall totals ranged from 12 to 24 inches across the area.

Winter Storm in GRAND AND BATTLEMENT MESAS, COLORADO
From 14-FEB-18 23:00:00 to 15-FEB-18 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Snowfall amounts across the top of the Grand Mesa ranged from 10 to 14 inches while lighter accumulations of 3 to 6 inches were reported at lower elevations.

Winter Storm in GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS, COLORADO
From 14-FEB-18 23:00:00 to 16-FEB-18 00:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall totals ranged from 10 to 20 inches in the vicinity of Aspen with closer to 5 to 10 inches elsewhere across the zone. The greatest snowfall amount of 22.5 inches was measured by a trained storm spotter southwest of Snowmass.

Winter Weather in CENTRAL YAMPA RIVER BASIN, COLORADO
From 15-FEB-18 00:30:00 to 15-FEB-18 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall totals generally ranged from 3 to 6 inches across the area, with locally higher amounts up to 10 inches.

Winter Storm in FLATTOP MOUNTAINS, COLORADO
From 15-FEB-18 02:00:00 to 15-FEB-18 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Snowfall totals generally ranged from 8 to 15 inches across the area.