A massive crash occurred as freezing temperatures and icy conditions followed the first snowfall of the season, most of which fell the previous evening.  Hazardous conditions developed in Denver along an elevated portion of 6th Avenue during the early morning commute.  The crash involved approximately 100 vehicles.  There were no serious injuries, although one driver had to be extricated from a vehicle. The accidents occurred between Kalamath Street and  Federal Boulevard.   Numerous tow trucks took damaged or inoperable vehicles to a parking lot outside Empower Field at Mile High. The icy road conditions made it impossible for drivers to prevent from slamming into each other.  A major cleanup had to take place before 6th was reopened later in the morning.  The closure lasted approximately 5 hours.  Several crashes occurred along Interstate 25 and 70, and included a multi-vehicle accident on the onramp from US 36 to I-25.   Storm totals in the mountains and foothills generally ranged from 4 to 12 inches.  At the National Weather Service in Boulder, 6.6 inches of snowfall was observed.  At Denver International Airport, 4.5 inches was observed.

Winter Weather in N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY, COLORADO
From 04-NOV-22 04:40:00 to 04-NOV-22 04:40:00 (MST-7)
Crop damage: 0.00K
Reported by: Broadcast Media

Icy road conditions resulted in a 100-car pileup along 6th Ave.  It forced the closure of the roadway for several hours.

Winter Weather in S & E JACKSON / LARIMER / N & NE GRAND / NW BOULDER COUNTIES ABOVE 9000 FEET, COLORADO
From 03-NOV-22 10:00:00 to 04-NOV-22 03:00:00 (MST-7)
Reported by: SNOTEL

A SNOTEL station 4 miles south of Longs Peak estimated 12 inches of snowfall.  Storm totals elsewhere ranged from 5 to 10.5 inches.

Winter Weather in S & SE GRAND / W CENTRAL & SW BOULDER / GILPIN / CLEAR CREEK / SUMMIT / N & W PARK COUNTIES ABOVE 9000 FEET, COLORADO
From 03-NOV-22 10:00:00 to 04-NOV-22 05:00:00 (MST-7)
Reported by: SNOTEL

Storm totals ranged from 5 to 10.5 inches.

Winter Weather in LARIMER & BOULDER COUNTIES BETWEEN 6000 & 9000 FEET, COLORADO
From 03-NOV-22 14:00:00 to 04-NOV-22 03:00:00 (MST-7)
Reported by: Trained Spotter

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 03-NOV-22 14:00:00 to 04-NOV-22 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals ranged from 2 to 7 inches.

Winter Weather in BOULDER & JEFFERSON COUNTIES BELOW 6000 FEET / W BROOMFIELD COUNTY, COLORADO
From 03-NOV-22 17:00:00 to 04-NOV-22 05:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Official NWS Observations

Storm totals varied anywhere from from 1.5 to 7 inches, with 6.6 inches observed at the National Weather Service in Boulder.

Winter Weather in N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY, COLORADO
From 03-NOV-22 17:00:00 to 04-NOV-22 04:00:00 (MST-7)
Crop damage: 0.00K
Reported by: Official NWS Observations

Snowfall totals around Denver varied from 1.5 to 4.5 inches.  The official snowfall measurement at Denver International Airport was 4.5 inches.

Winter Weather in ELBERT / C & E DOUGLAS COUNTIES ABOVE 6000 FEET, COLORADO
From 03-NOV-22 17:00:00 to 04-NOV-22 02:00:00 (MST-7)
Reported by: CoCoRaHS

Storm totals ranged from 1 to 4 inches.

Winter Weather in WEST JACKSON & WEST GRAND COUNTIES ABOVE 9000 FEET, COLORADO
From 03-NOV-22 10:00:00 to 04-NOV-22 03:00:00 (MST-7)
Reported by: SNOTEL

Storm totals ranged from 4 to 7.5 inches.