An upper disturbance moved east across Northwest California during early to mid December. Locally heavy low-elevation rainfall was observed, along with areas of heavy mountain snow. Impacts due to falling trees occurring with periods of strong gusty winds were also observed.

Winter Weather in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 09-DEC-22 09:00:00 to 09-DEC-22 16:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Four inches of snow at an elevation near 2900 feet.

Heavy Rain in MENDOCINO, CALIFORNIA
From 10-DEC-22 02:00:00 to 10-DEC-22 06:00:00 (PST-8)
Location: HOPLAND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain caused a rock slide across Highway 101. Several vehicles crashed as a result.

Strong Wind in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 10-DEC-22 08:54:00 to 10-DEC-22 08:54:00 (PST-8)
Magnitude: 49.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

Wind gust to 57 mph caused power lines to fall across road. Impacts occurred near an elevation of 2200 feet.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 08-DEC-22 11:00:00 to 09-DEC-22 11:11:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two inches of snow at an elevation near 3000 feet.

Winter Weather in NORTHERN TRINITY, CALIFORNIA
From 10-DEC-22 05:30:00 to 10-DEC-22 08:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Four inches of snow at an elevation of 1950 feet.

Heavy Rain in MENDOCINO, CALIFORNIA
From 10-DEC-22 02:00:00 to 10-DEC-22 08:00:00 (PST-8)
Location: BOONVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain caused a landslide across Route 128.

High Wind in COASTAL DEL NORTE, CALIFORNIA
From 09-DEC-22 19:00:00 to 09-DEC-22 19:00:00 (PST-8)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Tree fell on vehicle causing accident.

Heavy Snow in NORTHERN TRINITY, CALIFORNIA
From 10-DEC-22 02:00:00 to 10-DEC-22 13:29:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Ten inches of snow over a 24 hour period at an elevation near 5000 feet.

Strong Wind in NORTHERN HUMBOLDT COAST, CALIFORNIA
From 10-DEC-22 08:30:00 to 10-DEC-22 08:30:00 (PST-8)
Magnitude: 39.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

Strong winds knocked powerlines across roadway along coastal Humboldt County.

High Wind in COASTAL DEL NORTE, CALIFORNIA
From 10-DEC-22 09:22:00 to 10-DEC-22 09:22:00 (PST-8)
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

Power lines down across Highway 197 and 199 due to high wind gusts.

Heavy Rain in MENDOCINO, CALIFORNIA
From 10-DEC-22 02:00:00 to 10-DEC-22 07:00:00 (PST-8)
Location: LEGGETT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain caused rock and mud to flow across Highway 101.

Strong Wind in NORTHERN HUMBOLDT COAST, CALIFORNIA
From 10-DEC-22 12:11:00 to 10-DEC-22 12:11:00 (PST-8)
Magnitude: 43.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Strong winds caused a tree to fall across Highway 101. A car smashed into the tree resulting in serious injuries.

Heavy Rain in TRINITY, CALIFORNIA
From 10-DEC-22 02:00:00 to 10-DEC-22 08:00:00 (PST-8)
Location: DEL LOMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain caused a rockslide that spread across Highway 299 leading to a truck accident.