A shortwave trough brought light to moderate mountain snow to interior northern California March 5-6, which lead to chain controls and some travel delays for the period. Long wave troughing set up shortly after that with moderate to heavy snow being reported March 8-10. Widespread travel impacts occurred including chain controls and travel delays.

Winter Weather in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 05-MAR-21 22:00:00 to 06-MAR-21 06:00:00 (PST-8)
Reported by: CoCoRaHS

CoCoRaHS observers at 5.3 ENE Shingletown and 2.5 E Shingletown reported 7 inches and 5 inches of new snow accumulation.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 05-MAR-21 22:00:00 to 06-MAR-21 06:00:00 (PST-8)
Reported by: Public

Ski resorts across the Sierra Nevada reported between 1 and 5 inches of new snow by 8AM March 6. Sierra-at-Tahoe reported 5 inches of snow, Boreal, Sugar Bowl, and Soda Springs reported 4 inches, Squaw/Alpine reported 3 inches, and Bear Valley reported 1 inch of snow.

Winter Storm in MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO WESTERN COLUSA COUNTY, CALIFORNIA
From 09-MAR-21 02:30:00 to 10-MAR-21 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS reported 1 inch of snow at the 3.4 NW Igo location.

Winter Storm in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 09-MAR-21 12:00:00 to 10-MAR-21 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Chester, Manzanita, Mineral, and Quincy COOP sites reported 8, 9, 6, and 8 inches storm total snow respectively.

Winter Storm in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 09-MAR-21 12:00:00 to 10-MAR-21 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Chester, Manzanita, Mineral, and Quincy COOP sites reported 8, 9, 6, and 8 inches storm total snow respectively.

Winter Storm in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 09-MAR-21 12:00:00 to 10-MAR-21 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Caltrans reported 2 and 3 feet of snow at Kingvale, Soda Springs, and Donner Summit, 14 inches of at Eagle Lakes, 10 inches at Snow Park along highway 108, 6 inches at Longbarn.

Winter Storm in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 09-MAR-21 12:00:00 to 10-MAR-21 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ski resorts across the Sierra Nevada reported between 1 and 3 feet of storm total snow by 10AM March 11. Dodge Ridge reported 17 inches, Kirkwood 22 inches, Sugar Bowl 27 inches, Squaw Valley 25 inches, Alpine Meadows and Tahoe Donner 20 inches, Bear Valley reported 19 inches, Sierra-at-Tahoe and Soda Springs 15 inches, and 14 inches at Boreal.

Winter Storm in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 09-MAR-21 12:00:00 to 10-MAR-21 19:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The Bowman Lake, Calaveras Big Trees, Cherry Valley Dam, Downieville, Pacific House, and Strawberry Valley COOP sites respectively reported 16 inches, 11 inches, 10 inches, 6 inches, 8 inches, and 18 inches of storm total snow accumulation.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 05-MAR-21 22:00:00 to 06-MAR-21 06:00:00 (PST-8)
Reported by: Department of Highways

Caltrans reported 6 inches of new snow accumulation at Soda Springs, 3 inches Eagle Lakes, and 4 inches at Kingvale and Donner Summit.

Winter Storm in MOTHERLODE/CAMPTONVILLE TO GROVELAND, CALIFORNIA
From 09-MAR-21 22:12:00 to 10-MAR-21 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The Georgetown, Grass Valley, and Nevada City COOP sites reported 5 inches, 3 inches, and 9 inches of storm total snow accumulation.

Winter Storm in MOTHERLODE/CAMPTONVILLE TO GROVELAND, CALIFORNIA
From 09-MAR-21 22:12:00 to 10-MAR-21 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Observers from CoCoRaHS reported 14 inches of storm total snow in Nevada City and 8 inches in Grass Valley.