A wet winter storm produced widespread blowing and drifting snow across much of the urban corridor and northeast plains of Colorado.  Much of the region received a prolonged period of light to moderate snow, with bands of heavy wet snow from the 17th through the 18th.  At Denver International Airport, 9.2 inches of snowfall was observed along with 0.87 inches of precipitation.  This was the 8th largest 2-day snow event for Denver in the month of January to date.  The greatest impacts occurred east and northeast of Denver.   Across much of the urban corridor and northeast plains, storm totals ranged from from 3 to 12 inches, with 4 to 9 inches in the mountains and foothills.  Warming shelters were opened up in Denver and several school districts across the region were closed.  At Denver International Airport, there were 263 flight cancellations and 134 delayed flights.
Snow and blowing snow caused whiteout  conditions, along with drifting snow up to 3 feet deep.  Along the Interstate 70 corridor east of Denver to the Kansas state line, several 20 to 80 car pile ups were reported.  Numerous road closures were implemented across the northeast plains of Colorado, outside of the metro areas. The closures included:  Interstate 76 from Sterling to Nebraska state line;  CO 14 East of US Highway 85, US 138 Sterling to Julesburg, US 6 from Sterling to Nebraska state line, CO 52 from Fort Morgan to CO 14, CO 113 north of Iliff, CO 55 near Crook, CO 59 Sedgwick to Yuma, CO 385 Nebraska state line and Julesburg to Wray, CO 23 Holyoke to Nebraska state line, CO 11 north of Julesburg.

Winter Storm in LARIMER COUNTY BELOW 6000 FEET / NW WELD COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included 8 inches in Loveland, with 5 inches in Fort Collins.

Winter Storm in N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  11 inches, 3 miles east-southeast of Aurora, 9.2 inches at Denver International Airport, 8 inches in Cherry Hills Village, 7 inches in Englewood, with 6.5 inches in Lakewood.

Winter Storm in LOGAN COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 23:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included 10.5 inches in Iliff and 5.4 inches in Sterling.

Winter Storm in BOULDER & JEFFERSON COUNTIES BELOW 6000 FEET / W BROOMFIELD COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  7 inches in Broomfield, 6.5 inches in Erie, 6 inches in Arvada, Lafayette and Longmont; with 5.6 inches in Boulder.

Winter Storm in C & S WELD COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  9.8 inches in Windsor, 8.8 inches near Firestone, 7.4 inches in Brighton, 7 inches near Mead, 6.5 inches in Greeley, with 6 inches in Johnstown and Nunn.

Winter Storm in WASHINGTON COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 23:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  10 inches in Cope, 9.4 inches in Platner, and 5.3 inches north of Hyde.

Winter Storm in C & E ADAMS & ARAPAHOE COUNTIES, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 20:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  12.5 inches, 5 miles south of Manila Village; 9.5 inches in Strasburg, with 9.3 inches in Bennett.

Winter Storm in SEDGWICK COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 23:00:00 (MST-7)
Property damage: 0.00K
Reported by: Trained Spotter

Storm totals included 8.5 inches in Sedgwick.

Winter Storm in PHILLIPS COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 23:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included 6 to 10.5 inches in and around Holyoke.

Winter Weather in WEST JACKSON & WEST GRAND COUNTIES ABOVE 9000 FEET, COLORADO
From 17-JAN-23 14:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Storm totals ranged from 5 to 9 inches.

Winter Weather in S & E JACKSON / LARIMER / N & NE GRAND / NW BOULDER COUNTIES ABOVE 9000 FEET, COLORADO
From 17-JAN-23 14:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Storm totals ranged from 4 to 8 inches.

Winter Weather in JEFFERSON & W DOUGLAS COUNTIES ABOVE 6000 FEET / GILPIN / CLEAR CREEK / NE PARK COUNTIES BELOW 9000 FEET, COLORADO
From 17-JAN-23 14:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals ranged from 3 to 6 inches.

Winter Storm in ELBERT / C & E DOUGLAS COUNTIES ABOVE 6000 FEET, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  12 inches in Elbert, Elizabeth and Ponderosa Park; 10 inches in Castle Rock and 4 miles north of Kiowa, 9 inches at the Pinery, and 8 inches in Parker.

Winter Weather in NE WELD COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm totals ranged from 2 to 5 inches.

Winter Weather in MORGAN COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm totals ranged from 3 to 5 inches.

Winter Weather in N & NE ELBERT COUNTY BELOW 6000 FEET / N LINCOLN COUNTY, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm totals up to 3 inches were reported.  The combination of snow and wind produced whiteout conditions along I-70 with areas of blowing and drifting snow.  Law enforcement reported 20 to 80 car pileups.

Winter Weather in S & SE GRAND / W CENTRAL & SW BOULDER / GILPIN / CLEAR CREEK / SUMMIT / N & W PARK COUNTIES ABOVE 9000 FEET, COLORADO
From 17-JAN-23 17:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Storm totals ranged from 4 to 8 inches.

Winter Weather in LARIMER & BOULDER COUNTIES BETWEEN 6000 & 9000 FEET, COLORADO
From 17-JAN-23 14:00:00 to 18-JAN-23 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals ranged from 4 to 6 inches.