A vigorous Pacific storm system produced significant snowfall for elevations above 5000 feet in southeast Wyoming.  Interstates 25 and 80 were closed for several hours due to adverse winter driving conditions.  Gusty north to northeast winds to 35 mph and the heavy, wet snow toppled many trees and limbs, some onto power lines.  There were scattered power outages reported.  Cheyenne set a record 24-hour snowfall with 11.3 inches, and a two-day total of 14.3 inches.  Totals from the snowstorm ranged from six to 32 inches, heaviest for elevations above 8500 feet.

Winter Storm in SHIRLEY BASIN, WYOMING
From 18-MAY-17 02:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Eight inches of snow was measured at Medicine Bow.

Winter Storm in SIERRA MADRE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Webber Springs SNOTEL site (elevation 9250 ft) estimated 12 inches of snow.

Winter Storm in SIERRA MADRE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Whiskey Park SNOTEL site (elevation 8950 ft) estimated 15.6 inches of snow.

Winter Storm in SNOWY RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Medicine Bow SNOTEL site (elevation 10500 ft) estimated 12 inches of snow.

Winter Storm in NORTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A foot of snow was measured eight miles southwest of Douglas.

Winter Storm in NIOBRARA COUNTY, WYOMING
From 18-MAY-17 15:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Four to six inches of snow was observed from Manville to Lusk to Van Tassell.

Winter Storm in EAST PLATTE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Six inches of snow was measured six miles northeast of Glendo.

Winter Storm in SIERRA MADRE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Blackhall Mountain SNOTEL site (elevation 9820 ft) estimated 16.8 inches of snow.

Winter Storm in SNOWY RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The North French Creek SNOTEL site (elevation 10130 ft) estimated 12 inches of snow.

Winter Storm in SOUTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Crow Creek SNOTEL site (elevation 8330 ft) estimated 17 inches of snow.

Winter Storm in SOUTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

An observer four miles southeast of Buford measured 32 inches of snow.

Winter Storm in NORTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Windy Peak SNOTEL site (elevation 7900 ft) estimated 12 inches of snow.

Winter Storm in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

An observer 20 miles southwest of Wheatland measured 20.6 inches of snow.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer two miles north-northeast of Cheyenne measured 11.8 inches of snow.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer five miles northeast of Cheyenne measured 18.3 inches of snow.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Seventeen inches of snow was measured two miles north of Cheyenne.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Ten inches of snow was measured two miles west of Cheyenne.

Winter Storm in SOUTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer 21 miles west-southwest of Cheyenne measured 32 inches of snow.

Winter Storm in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Fifteen inches of snow was measured eight miles west of FE Warren AFB on Happy Jack Road.  Snow drifts were two to four feet.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Sixteen inches of snow was measured ten miles north of Cheyenne.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Nine inches of snow was measured three miles north-northwest of Cheyenne.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Eight inches of snow was measured two miles east of Cheyenne.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Nine inches of snow was measured five miles northeast of Cheyenne.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A foot of snow was measured three miles northwest of Burns.

Winter Storm in SNOWY RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Sand Lake SNOTEL site (elevation 10050 ft) estimated 16.8 inches of snow.

Winter Storm in SNOWY RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Cinnabar Park SNOTEL site (elevation 9574 ft) estimated 20 inches of snow.

Winter Storm in SNOWY RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Brooklyn Lake SNOTEL site (elevation 10240 ft) estimated 12 inches of snow.

Winter Storm in SHIRLEY BASIN, WYOMING
From 18-MAY-17 02:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Six inches of snow was measured at Shirley Basin.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thirteen inches of snow was observed at Cheyenne.

Winter Storm in LARAMIE VALLEY, WYOMING
From 18-MAY-17 02:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thirteen and a half inches of snow was measured four miles southeast of Laramie.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS at Cheyenne measured 14.3 inches of snow, with 11.3 inches falling in a 24-hour period.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Ten inches of snow was measured two miles east-northeast of Cheyenne.

Winter Storm in CENTRAL LARAMIE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer in northwest Cheyenne measured 11.4 inches of snow.

Winter Storm in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

An observer eight miles southwest of Wheatland measured 13.5 inches of snow.

Winter Storm in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Fourteen inches of snow was measured at Horse Creek.  Snow drifts were two to four feet.

Winter Storm in NORTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two feet of snow was observed seven mikes east of Garrett.

Winter Storm in SOUTH LARAMIE RANGE, WYOMING
From 17-MAY-17 21:00:00 to 19-MAY-17 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A foot of snow was observed 12 miles east-northeast of Bosler.

Winter Storm in LARAMIE VALLEY, WYOMING
From 18-MAY-17 02:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Eight inches of snow was measured at Laramie.

Winter Storm in LARAMIE VALLEY, WYOMING
From 18-MAY-17 02:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Fourteen inches of snow was observed 11 miles southwest of Laramie.

Winter Storm in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Nine inches of snow was measured nine miles west-southwest of Rock River.

Winter Storm in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Eleven and a half inches of snow was measured 18 miles south of Rock River.

Winter Storm in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Seven inches of snow was measured just southwest of Elk Mountain.

Winter Storm in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 18-MAY-17 00:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Ten inches of snow was observed at Arlington.

Winter Storm in EAST PLATTE COUNTY, WYOMING
From 18-MAY-17 09:00:00 to 19-MAY-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Six inches of snow was measured five miles south of Guernsey.