A series of storms struck northern California during this week...leading to prolonged snowstorms.   Initially the snow level was in the 4500-5000 foot range...but it dropped to near 3500 feet in the middle of the week.   During this particular event...the snow level started off high and dropped to the 3500-4000 foot range toward the end of the event.

Heavy Snow in WESTERN SISKIYOU COUNTY, CALIFORNIA
From 17-JAN-10 10:00:00 to 18-JAN-10 03:38:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Snow levels remained above the populated areas at 4500-5000 feet.  However, RAWS stations in the area reported significant precipitation.  The RAWS at Scott Mountain near Callahan at 5900 feet recorded 1.08 inches liquid equivalent in 11 hours between 17/1000 and 17/2100 PST.  Converting this to snow, even using a very wet 6 inches snow to 1 inch rain ratio, yields enough snow to verify the warning.

Heavy Snow in NORTH CENTRAL & SOUTHEAST SISKIYOU COUNTY, CALIFORNIA
From 17-JAN-10 10:00:00 to 18-JAN-10 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Based on reports in adjacent zone CAZ082, it is assumed that warning criteria was met in this zone.   Those reports are detailed below.
Snow levels remained above the populated areas at 4500-5000 feet.  However, RAWS and Caltrans stations in the area reported significant precipitation.  The Caltrans station at Snowman's Summit recorded 1.49 inches liquid equivalent in the first 12 hours of the event.  Converting this to snow, even using a very wet 4 inches snow to 1 inch rain ratio, yields enough snow to verify the warning.  This station recorded a whopping 4.82 inches liquid equivalent during this event.  The Mount Shasta City ASOS recorded 3.50 inches and the Mount Shasta City RAWS recorded 4.39 inches liquid during the same interval.
A number of spotter reports came in...mostly after the snow levels dropped toward the end of the event.  A spotter 6 NW of Mount Shasta City reported 6 inches of snow in 7 hours ending at 18/2000 PST.  A spotter 2SSW Weed reported 6 inches of snow in less than 12 hours beginning at 18/1200 PST. A spotter 4SSW Weed reported 6 inches of snow from early afternoon into the eveniing on 01/18/10.  A spotter 4SW Weed reported 5 inches between 18/1200 and 18/1500 PST, then another inch in the evening.

Heavy Snow in SOUTH CENTRAL SISKIYOU COUNTY, CALIFORNIA
From 17-JAN-10 10:00:00 to 18-JAN-10 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Snow levels remained above the populated areas at 4500-5000 feet.  However, RAWS and Caltrans stations in the area reported significant precipitation.  The Caltrans station at Snowman's Summit recorded 1.49 inches liquid equivalent in the first 12 hours of the event.  Converting this to snow, even using a very wet 4 inches snow to 1 inch rain ratio, yields enough snow to verify the warning.  This station recorded a whopping 4.82 inches liquid equivalent during this event.  The Mount Shasta City ASOS recorded 3.50 inches and the Mount Shasta City RAWS recorded 4.39 inches liquid during the same interval.
A number of spotter reports came in...mostly after the snow levels dropped toward the end of the event.  A spotter 6 NW of Mount Shasta City reported 6 inches of snow in 7 hours ending at 18/2000 PST.  A spotter 2SSW Weed reported 6 inches of snow in less than 12 hours beginning at 18/1200 PST. A spotter 4SSW Weed reported 6 inches of snow from early afternoon into the evening on 01/18/10.  A spotter 4SW Weed reported 5 inches between 18/1200 and 18/1500 PST, then another inch in the evening.