Cold air aloft spread across northwest California as an upper trough deepened over the northeastern Pacific. Coastal small hail and mountain snow occurred as a result.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 01-MAR-18 08:00:00 to 02-MAR-18 08:50:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow total of 0.5 inch of snow at an elevation of 1647 feet.

Heavy Snow in SOUTHERN TRINITY, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 09:03:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 15 inches of snow at an elevation of 3200 feet.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 09:10:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 12 inches of snow.

Winter Weather in SOUTHWESTERN HUMBOLDT, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 08:47:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 1.5 inches of snow at an elevation of 1650 feet.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 10:04:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 4 inches of snow.

Heavy Snow in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 11:03:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 6 inches of snow at an elevation of 2800 feet.

Heavy Snow in DEL NORTE INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 00:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

CALTRANS snowplow driver reported 18 inches of snow near the Collier Tunnel on HWY 199. Time estimated.

Heavy Snow in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

CALTRANS estimated 5 inches of snow at Berry Summit maintenance building.

Winter Weather in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 0.5 inch of snow at an elevation of 400 feet.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 01-MAR-18 14:36:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported 1 inch of snow at an elevation of 2800 feet.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 01-MAR-18 17:18:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 3 inches of snow. Snowfall rate was approximately 1 inch per hour.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 01-MAR-18 17:46:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported 5 inches of snow on the ground.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 02-MAR-18 13:55:00 to 02-MAR-18 14:15:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Public report of 1 inch of snow at an elevation of 2000 feet.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 02-MAR-18 13:47:00 to 02-MAR-18 14:47:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 2 inches of snow occurring in one hour at an elevation of 1980 feet.

Heavy Snow in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 10:28:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 12 inches of storm total snow at an elevation of 3750 feet.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 02-MAR-18 12:00:00 to 02-MAR-18 19:11:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2.5 inches of snow occurring at an elevation of 2500 feet.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 02-MAR-18 10:00:00 to 02-MAR-18 16:22:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2 inches of snow at an elevation of 1200 feet.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 19:39:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 7 inches of snow at an elevation of 2200 feet.

Heavy Snow in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 15:45:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Twelve inches of snow.

Heavy Snow in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 15:45:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Fourteen inches of snow.

Heavy Snow in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 15:45:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Fourteen inches of snow.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 01-MAR-18 18:18:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 7 inches of snow near Buck Mountain. Elevation 2500 feet.

Winter Weather in SOUTHWESTERN HUMBOLDT, CALIFORNIA
From 01-MAR-18 10:30:00 to 01-MAR-18 20:55:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 1.5 inches of snow at an elevation of 1650 feet.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 01-MAR-18 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 8 inches of snow at an elevation of 2800 feet.

Winter Weather in SOUTHEASTERN MENDOCINO INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 04:20:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2 inches of snow.

Winter Weather in NORTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 08:10:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 4 inches of snow near Brannan Mountain at an elevation of 1800 feet.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 02-MAR-18 19:17:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported 18 inches of snow at an elevation of 2800 feet.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 02-MAR-18 02:00:00 to 02-MAR-18 18:48:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 4 inches of snow at an elevation of 2500 feet.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 02-MAR-18 07:00:00 to 03-MAR-18 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow total of 4.2 inches.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2 inches of snow.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

One inch of snow.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Two inches of snow.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 08:27:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 3 inches of snow at an elevation of 2800 feet.

Heavy Snow in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 03-MAR-18 10:19:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter report of 13.5 inches of storm total snow at an elevation of 2000 feet.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 10:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

One inch of snow.

Heavy Snow in NORTHERN TRINITY, CALIFORNIA
From 01-MAR-18 10:30:00 to 03-MAR-18 14:22:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 28 inches of storm total snow at an elevation of 3500 feet near Trinity Lake.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 03-MAR-18 16:31:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 14 inches of storm total snow at an elevation of 2470 feet.

Winter Weather in NORTHWESTERN MENDOCINO INTERIOR, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 07:49:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated 4.3 inches of snow at an elevation of 2500 feet near Brooktrails.

Winter Weather in NORTHERN TRINITY, CALIFORNIA
From 03-MAR-18 04:00:00 to 03-MAR-18 08:12:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated 2 inches of snow at an elevation of 1400 feet.

Winter Weather in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 03-MAR-18 03:00:00 to 03-MAR-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Light dusting of snow (0.1 inch) on Mattole Road through Humboldt Redwoods State Park.

Heavy Snow in SOUTHERN HUMBOLDT INTERIOR, CALIFORNIA
From 01-MAR-18 10:30:00 to 03-MAR-18 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Estimated 24 inches of snow at Grasshopper peak at an elevation of 3300 feet.

Hail in DEL NORTE, CALIFORNIA
From 01-MAR-18 09:11:00 to 01-MAR-18 09:11:00 (PST-8)
Location: NORTHCREST
Magnitude: 0.25 
Property damage: 0.10K
Crop damage: 0.00K
Reported by: Law Enforcement

A car slid into a ditch due to a hail covered road.

Hail in HUMBOLDT, CALIFORNIA
From 01-MAR-18 22:20:00 to 01-MAR-18 22:20:00 (PST-8)
Location: LOLETA
Magnitude: 0.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail covered road led to 2 vehicle accident with 1 injury.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 01-MAR-18 08:00:00 to 02-MAR-18 07:53:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall total of 6.2 inches at an elevation of 2762 feet.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 01-MAR-18 08:00:00 to 02-MAR-18 08:47:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Storm total snowfall of 6.5 inches at an elevation of 2532 feet.

Winter Weather in SOUTHERN TRINITY, CALIFORNIA
From 01-MAR-18 08:00:00 to 02-MAR-18 08:32:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snowfall total of 5 inches at an elevation of 1800 feet.