A long lasting winter storm occurred during this interval, caused by a series of closely spaced storms.

Blizzard in NORTH CENTRAL & SOUTHEAST SISKIYOU COUNTY, CALIFORNIA
From 20-DEC-12 09:00:00 to 23-DEC-12 15:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter N Tennant reported visibilities of 1/4 mile in snow and blowing snow with winds estimated at 45 mph gusting to 60-70 mph.

Heavy Snow in CENTRAL SISKIYOU COUNTY, CALIFORNIA
From 20-DEC-12 08:00:00 to 21-DEC-12 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter 5SSE Yreka reported 21 inches in 24 hours ending at 21/0800 PST, including 9 inches in 8 hours ending at 20/1600 PST.

Heavy Snow in MODOC COUNTY, CALIFORNIA
From 20-DEC-12 17:30:00 to 21-DEC-12 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter 4WNW Lookout reported 14 inches in 14 hours ending at 21/0730 PST.

Heavy Snow in SOUTH CENTRAL SISKIYOU COUNTY, CALIFORNIA
From 20-DEC-12 03:00:00 to 23-DEC-12 16:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter 1WSW Mount Shasta reported 12 inches of snow in 10.5 hours ending at 20/1330 PST.  A spotter 3SSE Mount Shasta reported 9 inches in 6 hours ending at 20/1500 PST, with 14 inches storm total so far.  The cooperative observer at Mount Shasta City reported 12 inches in 7 hours ending at 20/1500 PST, another 9 inches in 12 hours ending at 21/0700, and another 5 inches overnight ending at 22/0900 PST.  His storm total was 40 inches.  Later on he reported 12 inches in 24 hours ending at 23/2000 PST with 35 inches on the ground.  A spotter SSE Mount Shasta reported 4 inches in 5 hours ending at 20/1300 PST, 6 inches in 3 hours ending at 20/1630 PST, another 5 inches in 2.75 hours ending at 20/1915 PST, and another 7 inches in 12.5 hours ending at 21/0730 PST, for a storm total of 22 inches. A CoCoRahs observer 5.1 NW Mount Shasta City reported 17.1 inches of snow in 24 hours ending at 21/1000 PST.

Heavy Snow in WESTERN SISKIYOU COUNTY, CALIFORNIA
From 20-DEC-12 08:00:00 to 23-DEC-12 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter E Fort Jones at 2650 feet reported 14.5 inches of snow in 24 hours ending at 21/0800 PST.  A spotter 2NE Seiad Valley reported 4 inches in 21 hours ending at 21/0700 PST, and he reported many power lines and trees down in the area due to heavy wet snow.

Heavy Snow in NORTH CENTRAL & SOUTHEAST SISKIYOU COUNTY, CALIFORNIA
From 21-DEC-12 07:30:00 to 22-DEC-12 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter N Tennant reported 12 inches of snow in 24 hours ending at 22/0730 PST with 22 inches on the ground.  The same spotter reported 5 additional inches of snow in 8 hours ending at 23/0800 PST with 28 inches on the ground.

Blizzard in NORTH CENTRAL & SOUTHEAST SISKIYOU COUNTY, CALIFORNIA
From 23-DEC-12 08:00:00 to 23-DEC-12 16:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter N Tennant reported visibilities of 50 yards in blowing snow with winds estimated at 35 mph gusting to 45 mph.