A cold northerly flow, associated with a strong upper level jet stream, combined with low level upslope to produce a period of moderate to heavy snowfall in and near the foothills.  The heaviest snowfall focused over Boulder County where 19.3 inches was observed near Eldorado Springs, with 18 inches in northwest Boulder.
Storm totals elsewhere included:  16.5 inches at the National Weather Service in southwest Boulder; 15.5 inches near Genesee; 14 inches near Louisville; 13 inches, 2 miles southwest of Golden and Westminster, 11.5 inches in Kittredge and Lyons; 10 inches near Crescent Village, Erie, and Lafayette.

Winter Weather in C & S WELD COUNTY, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Localized bands of heavy snow spilled into central Weld County.  Storm totals included:  11 inches, 4 miles west of La Salle; 9 inches near Kersey, 6.5 inches near Mead, 5.5 inches near Firestone; 5 inches near Greeley.

Winter Weather in LARIMER COUNTY BELOW 6000 FEET / NW WELD COUNTY, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included 10 inches near Loveland, and 4.5 inches near Fort Collins.

Winter Weather in S & E JACKSON / LARIMER / N & NE GRAND / NW BOULDER COUNTIES ABOVE 9000 FEET, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Storm totals ranged from 4 to 8 inches.

Winter Weather in S & SE GRAND / W CENTRAL & SW BOULDER / GILPIN / CLEAR CREEK / SUMMIT / N & W PARK COUNTIES ABOVE 9000 FEET, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Storm totals ranged from 5 to 9 inches.

Winter Weather in JEFFERSON & W DOUGLAS COUNTIES ABOVE 6000 FEET / GILPIN / CLEAR CREEK / NE PARK COUNTIES BELOW 9000 FEET, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Storm totals included:  15.5 inches near Genesee; 13 inches, 2 miles southwest of Golden; 11.5 inches near Kittredge; 10 inches near Crescent Village; 9 inches near Aspen Park; with 7.5 inches near Evergreen.

Heavy Snow in BOULDER & JEFFERSON COUNTIES BELOW 6000 FEET / W BROOMFIELD COUNTY, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  18 inches in northwest Boulder; 16.5 inches at the National Weather Service in southwest Boulder; 14 inches near Louisville; 13 inches in Westminster, 11.5 inches in Lyons; 10 inches near Erie and Lafayette; 9 inches near Longmont and Niwot; 8 inches in Broomfield; 6.5 inches in west Arvada; 6 inches in Lakewood, Littleton and Wheat Ridge.

Heavy Snow in LARIMER & BOULDER COUNTIES BETWEEN 6000 & 9000 FEET, COLORADO
From 11-APR-20 23:00:00 to 13-APR-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm totals included:  19.3 inches near Eldorado Springs; 16 inches near Pinewood Springs; 15 inches near Jamestown; 13 inches, 4 miles northeast of Nederland; 11.5 inches in Meeker Park; 11 inches near Buckhorn Mountain and Rollinsville; 10 inches near Berthoud; 8 inches near Estes Park and Mishowaka.