A strong upper level low brought an end to record heat through the first week of September and provided Denver with one of its earliest measurable snowfalls on record. By the evening of September 7th, a series of cold fronts progressed southward from Wyoming into Colorado, and dropped the temperature down into the low 30s by early morning of the 8th. Snow developed across the Front Range mountains and foothills, while a mix of rain and snow developed along the I-25 corridor.  On the 8th, accumulating snow was mostly confined to the higher elevations, eventually spreading across the plains during the late afternoon and evening period. Light snow spread across the far eastern plains overnight, and tapered off the morning the 9th.  In the Front Range Front Range mountains, foothills, and South Park storm totals ranged from 4 to 12 inches.  The early season snow brought a welcome but relatively brief period of relief for the ongoing wildfires.  Along the urban corridor, storm totals ranged from 3 to 6 inches mainly west of Interstate 25 and over the Palmer Divide south and southeast of Denver.  The heavy and wet snow downed some fully leaved trees and snapped large  tree limbs in Boulder and Golden, and caused electrical outages.  Boulder was hardest hit with 6500 outages.

Winter Weather in LARIMER & BOULDER COUNTIES BETWEEN 6000 & 9000 FEET, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included:  10-12 inches over the Cameron wildfire southwest of Red Feather Lakes, 10.5 inches in Rist Canyon, 9 inches at Eldorado Springs, 8 inches, 7 miles southwest of Virginia Dale,  7 inches near Jamestown and Red Feather Lakes;  6.5 inches near Estes Park and Horsetooth Mountain; 6 inches near Allenspark and 5.5 inches near Ward.

Winter Weather in JEFFERSON & W DOUGLAS COUNTIES ABOVE 6000 FEET / GILPIN / CLEAR CREEK / NE PARK COUNTIES BELOW 9000 FEET, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included:  8 inches near Genesee and 12 miles northwest of Golden, 5.5 inches near Kittredge, 5 inches near Evergreen, with 4.5 inches near Idaho Springs.

Winter Weather in LARIMER COUNTY BELOW 6000 FEET / NW WELD COUNTY, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included 4 to 5 inches in west Fort Collins, with 2 to 4 inches over the rest of Fort Collins, Laporte and Loveland.

Winter Weather in ELBERT / C & E DOUGLAS COUNTIES ABOVE 6000 FEET, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included:  7 inches near Monument, 4.5 inches near Elizabeth, with 4 inches at Castle Rock and Elizabeth.

Winter Weather in C & SE PARK COUNTY, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included:  12 inches near Alma, with 8 inches near Fairplay and Lake George.

Winter Weather in N & NE ELBERT COUNTY BELOW 6000 FEET / N LINCOLN COUNTY, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included 5 inches near Hugo, 7 miles northeast of Limon, and 10 miles west-southwest of Karval.

Winter Weather in N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals  across the Denver area ranged from 1 to  3 inches.  At Denver International Airport, 1.0 inches was the official measurement on the 8th, making it the second earliest measurable snowfall for Denver to date.

Winter Weather in BOULDER & JEFFERSON COUNTIES BELOW 6000 FEET / W BROOMFIELD COUNTY, COLORADO
From 07-SEP-20 22:00:00 to 09-SEP-20 05:00:00 (MST-7)
Reported by: Trained Spotter

Storm totals included:  6 inches in Golden, 5.5 inches in Boulder  4.5 inches in west Arvada.  Extensive tree damage was reported in Boulder and light to moderate tree damage elsewhere.  Power outages were also reported in Boulder.