An unseasonably cold low pressure system moved very slowly across Eastern Utah and Western Colorado. This system tapped moisture from the south and produced widespread late-season heavy snowfall across the mountains and high valleys.

Winter Storm in CENTRAL YAMPA RIVER BASIN, COLORADO
From 17-MAY-17 20:00:00 to 18-MAY-17 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Snowfall amounts ranged from 4 to 8 inches. The heaviest snow fell in and around Craig.

Winter Storm in GRAND AND BATTLEMENT MESAS, COLORADO
From 17-MAY-17 02:00:00 to 18-MAY-17 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Snowfall amounts varied from 8 to 15 inches above 10,000 feet with 2 to 8 inches reported below 10,000 feet.

Winter Storm in UPPER YAMPA RIVER BASIN, COLORADO
From 17-MAY-17 07:00:00 to 19-MAY-17 02:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts generally ranged from 7 to 12 inches.  Locally higher amounts included 15 inches measured near Steamboat Springs.

Winter Storm in FLATTOP MOUNTAINS, COLORADO
From 17-MAY-17 10:00:00 to 18-MAY-17 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Snowfall amounts ranged from 5 to 10 inches with locally higher amounts up to 13 inches rmeasured at the Ripple Creek SNOTEL site.

Winter Weather in UPPER GUNNISON RIVER VALLEY, COLORADO
From 17-MAY-17 19:03:00 to 19-MAY-17 06:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

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

Winter Storm in GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS, COLORADO
From 17-MAY-17 16:50:00 to 19-MAY-17 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall amounts varied across the zone with 8 to 12 inches measured over the higher mountains and 2 to 4 inches in the lower elevations. The highest amounts were in the Vail Pass area which ranged from 13 to 19 inches. Significant travel impacts were reported over Vail Pass with a safety closure in place for several hours.

Winter Weather in ROAN AND TAVAPUTS PLATEAUS, COLORADO
From 16-MAY-17 10:00:00 to 18-MAY-17 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall amounts averaged 3 to 4 inches across the zone. However, significant travel impacts were reported along Highway 139 over Douglas Pass.

Winter Weather in SOUTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 17-MAY-17 07:00:00 to 18-MAY-17 02:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall amounts ranged from 8 to 14 inches with locally higher amounts that included 16 inches measured at the Spud Mountain SNOTEL site. Travel restrictions were in place over the higher mountain passes for much of the storm.

Winter Weather in NORTHWESTERN SAN JUAN MOUNTAINS, COLORADO
From 17-MAY-17 10:00:00 to 18-MAY-17 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snowfall amounts ranged from 6 to 12 inches with locally higher amounts up to 15 inches measured at Slumgullion Pass and at the Swamp Angel study plot near Red Mountain Pass. Travel restrictions were in place for much of the event.

Winter Storm in WEST ELK AND SAWATCH MOUNTAINS, COLORADO
From 17-MAY-17 15:00:00 to 19-MAY-17 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall accumulations varied between 6 and 11 inches across the forecast zone.

Winter Weather in CENTRAL COLORADO RIVER BASIN, COLORADO
From 17-MAY-17 19:16:00 to 18-MAY-17 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall amounts ranged from 3 to 6 inches along the Interstate 70 corridor from Gypsum to Wolcott.

Winter Storm in ELKHEAD AND PARK MOUNTAINS, COLORADO
From 17-MAY-17 21:00:00 to 19-MAY-17 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Snowfall amounts ranged from 8 to 14 inches across most of the zone. However, the Whiskey Creek SNOTEL picked up 27 inches, while the Tower SNOTEL measured 39 inches during this event.

Winter Weather in UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE, COLORADO
From 18-MAY-17 04:00:00 to 18-MAY-17 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Snowfall amounts ranged from 4 to 8 inches.