A strong low pressure system brought widespread snow and blowing snow to portions of southeast Wyoming, mainly along and west of the Laramie Range. Total snowfall accumulations of 3 to 6 inches were common for the lower elevations, with isolated maximum amounts of 6 to 10 inches over higher terrain. In the mountains, 1 to 2 feet of snow fell across the Snowy, Sierra Madre, and northern Laramie Ranges at elevations above 8000 feet. Dangerous winter conditions resulted in the closure of Interstate 80 between Laramie and Rawlins from the evening of 10/12 into the early morning hours on 10/13.

Winter Weather in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 12-OCT-23 03:00:00 to 12-OCT-23 20:00:00 (MST-7)
Reported by: Mesonet

The official 24-hour NOHRSC gridded snowfall analysis ending at 5:00 AM MST on 10/13 indicates that widespread 3 to 6 inches of snow fell across lower elevations of northern Carbon County, with 6 to 12 inches in the mountains.

Winter Weather in SHIRLEY BASIN, WYOMING
From 12-OCT-23 03:00:00 to 12-OCT-23 20:00:00 (MST-7)
Reported by: Mesonet

The official 24-hour NOHRSC gridded snowfall analysis ending at 5:00 AM MST on 10/13 indicates that widespread 3 to 6 inches of snow fell across Shirley Basin.

Winter Weather in NIOBRARA COUNTY, WYOMING
From 12-OCT-23 05:00:00 to 12-OCT-23 20:00:00 (MST-7)
Reported by: Mesonet

The official 24-hour NOHRSC gridded snowfall analysis ending at 5:00 AM MST on 10/13 indicates a narrow strip of 3 to 6 inches of snow fell along the Pine Ridge in central Niobrara County.

Winter Storm in NORTH LARAMIE RANGE, WYOMING
From 12-OCT-23 02:00:00 to 13-OCT-23 00:00:00 (MST-7)
Reported by: SNOTEL

Multiple SNOTEL observations in the northern Laramie Range recorded estimated snowfall totals of 15+ inches. A maximum total of 19.2 inches was observed at the Laprele Creek SNOTEL (19 miles ENE of Shirley Basin) at an elevation of 8390 feet.

Winter Weather in CENTRAL CARBON COUNTY, WYOMING
From 12-OCT-23 03:00:00 to 12-OCT-23 20:00:00 (MST-7)
Reported by: Mesonet

The official 24-hour NOHRSC gridded snowfall analysis ending at 5:00 AM MST on 10/13 indicates isolated pockets of 3 to 6 inches of snow fell across portions of central Carbon County, heaviest south and east of Rawlins.

Winter Storm in SIERRA MADRE RANGE, WYOMING
From 11-OCT-23 10:00:00 to 12-OCT-23 19:00:00 (MST-7)
Reported by: SNOTEL

Multiple SNOTEL observations in the Sierra Madre Range recorded estimated snowfall totals of 12+ inches. A maximum total of 16.8 inches was observed at the Blackhall Mountain SNOTEL (8 miles SW of Skyline) at an elevation of 9838 feet.

Winter Storm in SNOWY RANGE, WYOMING
From 11-OCT-23 11:00:00 to 12-OCT-23 19:00:00 (MST-7)
Reported by: SNOTEL

Multiple SNOTEL observations in the Snowy Range recorded estimated snowfall totals of 12+ inches. A maximum total of 19.2 inches was observed at the Sand Lake SNOTEL (10 miles SSW of Arlington) at an elevation of 10,098 feet.

Winter Storm in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 12-OCT-23 05:00:00 to 12-OCT-23 22:00:00 (MST-7)
Reported by: CoCoRaHS

Multiple CoCoRaHS reports of 6 to 10 inches of snow in the North Snowy Range Foothills near Arlington and Elk Mountain. Interstate 80 between Laramie and Rawlins was closed due to winter weather from 7:16 PM MST on 10/12 until 6:20 AM MST on 10/13.

Winter Weather in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 12-OCT-23 02:00:00 to 13-OCT-23 00:00:00 (MST-7)
Reported by: Mesonet

A nearby CoCoRaHS observation of 4.6 inches of snow 8 miles NE of Bosler on the western slopes of the Laramie Range, coupled with data from the official NOHRSC gridded snowfall analysis, suggests snowfall totals of 4 to 6 inches likely spread into the higher elevations of the central Laramie Range southwest of Wheatland.

Winter Storm in SOUTH LARAMIE RANGE, WYOMING
From 12-OCT-23 07:00:00 to 12-OCT-23 20:00:00 (MST-7)
Reported by: SNOTEL

The Crow Creek SNOTEL (6 miles N of Vedauwoo) recorded an estimated snowfall total of 6 inches at an elevation of 8335 feet.

Winter Weather in LARAMIE VALLEY, WYOMING
From 12-OCT-23 06:00:00 to 12-OCT-23 20:00:00 (MST-7)
Reported by: CoCoRaHS

CoCoRaHS observers on the east side of the city of Laramie recorded up to 3 inches of snowfall.