Flash freeze winter event started the evening of the 26th through the morning and early afternoon hours on the 27th. Initial rain and freezing rain created slick conditions that iced up when precipitation transitioned to snow. The poor road conditions contributed to several accidents on area interstates, one of which contributed to a fatal crash north of Cheyenne. Highest snowfall totals were over a foot of snow.

Winter Weather in CENTRAL LARAMIE COUNTY, WYOMING
From 27-OCT-19 00:02:00 to 28-OCT-19 08:58:00 (MST-7)
Reported by: Law Enforcement

Light snowfall accumulation of 1.5 to near 3 inches were reported across the forecast zone with much of the snowfall falling during the overnight and morning hours. A driver heading southbound along Interstate 25 near mile marker 32.5 rolled their pickup truck twice after losing control due to falling snow and icy road conditions. The individual was transported to area hospital where they died from their injuries. The driver was wearing their seatbelt at the time of the crash.

Heavy Snow in SOUTH LARAMIE RANGE, WYOMING
From 27-OCT-19 00:02:00 to 27-OCT-19 13:19:00 (MST-7)
Reported by: CoCoRaHS

Observer located roughly twenty-one miles west-southwest of Warren Air Force Base measured a total snowfall of 7.3 inches.

Heavy Snow in SNOWY RANGE, WYOMING
From 26-OCT-19 17:00:00 to 27-OCT-19 15:00:00 (MST-7)
Reported by: SNOTEL

Estimated snowfall values for the sites at Sand Lake, Brooklyn Lake, and Cinnabar Park were calculated to be 12.0.

Heavy Snow in SIERRA MADRE RANGE, WYOMING
From 26-OCT-19 17:00:00 to 27-OCT-19 15:00:00 (MST-7)
Reported by: SNOTEL

Divide Peak sensor measured an estimated 12.0 inches of snowfall after receiving 0.6 of snow water equivalent.

Heavy Snow in SHIRLEY BASIN, WYOMING
From 26-OCT-19 17:10:00 to 27-OCT-19 09:52:00 (MST-7)
Reported by: Trained Spotter

Observer measured total snowfall of 8.0 inches at Medicine Bow. Heaviest snowfall based on observations at the Shirley Rim Wyoming Department of Transportation sensor fell between 1749 MST and 2128 MST with lighter accumulations in the remaining periods of the event.

Heavy Snow in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 26-OCT-19 22:34:00 to 27-OCT-19 09:08:00 (MST-7)
Reported by: CoCoRaHS

Observer located one mile southwest of Elk Mountain measured a total snowfall of 6.9 inches.

Heavy Snow in NORTH LARAMIE RANGE, WYOMING
From 26-OCT-19 23:00:00 to 27-OCT-19 11:00:00 (MST-7)
Reported by: Trained Spotter

Observer located sixteen miles south-southwest of Deer Creek measured a snowtotal of 15.0 inches.

Heavy Snow in NIOBRARA COUNTY, WYOMING
From 26-OCT-19 18:10:00 to 27-OCT-19 04:18:00 (MST-7)
Reported by: Public

Observer in Lusk measured snowfall of 6.0 inches.

Heavy Snow in GOSHEN COUNTY, WYOMING
From 26-OCT-19 18:10:00 to 27-OCT-19 13:19:00 (MST-7)
Reported by: Trained Spotter

Observer located eleven miles west-southwest of Hawk Springs measured a total snowfall of 6.0 inches.

Heavy Snow in EAST PLATTE COUNTY, WYOMING
From 26-OCT-19 18:28:00 to 27-OCT-19 13:19:00 (MST-7)
Reported by: Public

Observer located three miles east of Glendo measured a total snowfall of 6.0 inches. Snowfall created slick road conditions along Interstate 25 with multiple accidents being reported.

Heavy Snow in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 26-OCT-19 17:28:00 to 27-OCT-19 11:10:00 (MST-7)
Reported by: CoCoRaHS

Observer located a little over half a mile west-northwest of Glenrock measured a total snowfall  of 11.3 inches.

Heavy Snow in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 26-OCT-19 18:00:00 to 27-OCT-19 12:00:00 (MST-7)
Reported by: CoCoRaHS

Observer located twenty miles southwest of Wheatland measured a total snowfall of 7.4 inches.

Heavy Snow in CENTRAL CARBON COUNTY, WYOMING
From 26-OCT-19 18:55:00 to 27-OCT-19 13:19:00 (MST-7)
Reported by: Trained Spotter

Observer located one mile north of Rawlins measured snowfall amount of 9.5 inches.