A series of storm systems brought unsettled weather to interior northern California from February 11 through the 14. Snow levels for these systems were above 5000 and 6000 feet which is where most of the snow fell. Throughout the events chain controls were periodically raised and lifted. Highway 50 and state route 89 had a hard closure at one point. I-80 and highway 50 also had temporary holds at times due to vehicular collisions. Not much data is available on timing for these events though.

Winter Weather in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 11-FEB-21 12:00:00 to 12-FEB-21 03:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Manzanita and Mineral COOP sites reported 3 inches and 1 inch of new snow respectively.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 11-FEB-21 12:00:00 to 12-FEB-21 03:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ski resorts across the Sierra Nevada reported between 11 and 14 inches of new snow by 9AM Feb 12. Kirkwood reported 11 inches, Sugar Bowl, Boreal, Soda Springs, and Siera-at-Tahoe reported 12 inches, and Squaw/Alpine reported 14 inches of snow.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 11-FEB-21 12:00:00 to 12-FEB-21 03:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Caltrans reported 9 inches of new snow accumulation at Kingvale, 10 inches at Soda Springs, 12 inches at Donner Summit, and 5 inches of snow at Eagle Lakes.

Winter Weather in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 12-FEB-21 22:00:00 to 13-FEB-21 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Chester and Mineral reported 1 inch of snow accumulation each, while Manzanita reported 7 inches of snow.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 12-FEB-21 22:00:00 to 13-FEB-21 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ski resorts across the Sierra Nevada reported between 2 and 9 inches of new snow by 8AM Feb 13. Dodge Ridge received 2 inches of snow, Kirkwood got 3 inches, Sierra-at-Tahoe and Squaw/Alpine each got 6 inches, Bear Valley received 8 inches, and Sugar Bowl and Soda Springs got 9 inches.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 12-FEB-21 22:00:00 to 13-FEB-21 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Caltrans reported 9 inches of storm total snow accumulation at Kingvale, 15 inches at Soda Springs, 16 inches at Donner Summit, and 7 inches of snow at Eagle Lakes . Report was completed at 0600 on February 14.

Winter Weather in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 14-FEB-21 00:00:00 to 14-FEB-21 13:57:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The Mineral COOP site reported 2 inches of new snow.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 14-FEB-21 00:00:00 to 14-FEB-21 13:57:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Caltrans reported 1 inch of new snow accumulation at Kingvale, 6 inches at Soda Springs and Donner Summit.