A mid/upper low with a very cold airmass moved through in early February bringing snow to lower elevation peaks across the region prompting a rare Winter Weather Advisory. Junipero Serra Peak received around a foot of snow. Rainfall just ahead of this system also brought roadway flooding and minor debris flows.

Flood in MARIN, CALIFORNIA
From 03-FEB-19 23:57:00 to 04-FEB-19 00:27:00 (PST-8)
Location: LARKSPUR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Northbound 101 at Lucky all Lanes 3 inches deep.

Flood in SAN FRANCISCO, CALIFORNIA
From 04-FEB-19 02:43:00 to 04-FEB-19 03:13:00 (PST-8)
Location: SAN FRANCISCO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Southbound 101 4 to 5 inches blocking lanes.

Flood in SANTA CLARA, CALIFORNIA
From 04-FEB-19 06:02:00 to 04-FEB-19 06:32:00 (PST-8)
Location: LOS ALTOS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway on ramp extremely flooded.

Flood in MONTEREY, CALIFORNIA
From 04-FEB-19 06:11:00 to 04-FEB-19 06:41:00 (PST-8)
Location: CAMP MC CALLUM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Car stuck in two feet of water.

Flood in NAPA, CALIFORNIA
From 04-FEB-19 07:26:00 to 04-FEB-19 07:56:00 (PST-8)
Location: WEST NAPA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SR 12 at SR 121 northbound lanes flooded.

Flood in MONTEREY, CALIFORNIA
From 04-FEB-19 09:29:00 to 04-FEB-19 09:59:00 (PST-8)
Location: MONTEREY PNSLA ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Carmel River flooding near Mid Valley.

Flood in ALAMEDA, CALIFORNIA
From 04-FEB-19 10:23:00 to 04-FEB-19 10:53:00 (PST-8)
Location: SUNOL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Northbound 680 at SR 84 number 1-2 lanes flooded.

Flood in MONTEREY, CALIFORNIA
From 04-FEB-19 10:46:00 to 04-FEB-19 11:16:00 (PST-8)
Location: CARMEL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SR 1 at Rio Rod culvert is flooding, water going over the roadway.

Debris Flow in MONTEREY, CALIFORNIA
From 04-FEB-19 04:48:00 to 04-FEB-19 05:18:00 (PST-8)
Location: CARMEL VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rocks on road at Carmel Valley at Laureles Grade.

Debris Flow in SANTA CLARA, CALIFORNIA
From 04-FEB-19 10:00:00 to 04-FEB-19 10:30:00 (PST-8)
Location: REDWOOD ESTATES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 35 closed due to sinkhole.

Debris Flow in SONOMA, CALIFORNIA
From 04-FEB-19 10:46:00 to 04-FEB-19 11:16:00 (PST-8)
Location: JIMTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rockslide on SR-128 east of Chalk Hill Rd.

Heavy Snow in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 05-FEB-19 08:33:00 to 05-FEB-19 08:35:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Road closure due to snow at Empire Grade and Ice Cream Grade. Snow depth unknown.

Winter Weather in SAN FRANCISCO, CALIFORNIA
From 05-FEB-19 04:30:00 to 05-FEB-19 04:35:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Slushy snow 3 miles SW of San Francisco.

Winter Weather in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 05-FEB-19 07:20:00 to 05-FEB-19 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow report 1 mile WSW of Lexington Hills, 1/4 inch of snow on the ground.

Winter Weather in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 05-FEB-19 08:31:00 to 05-FEB-19 08:36:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Rain snow mix observed at the NWS office in Monterey, did not stick.

Winter Weather in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 05-FEB-19 16:16:00 to 05-FEB-19 16:21:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Snow reported on Mt Hamilton, snow depth 8 inches.

Winter Weather in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 06-FEB-19 07:52:00 to 06-FEB-19 07:53:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimate of 3 inches of snow on Mt Diablo summit trail 24 hours after snow fell.

Winter Weather in SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST, CALIFORNIA
From 06-FEB-19 07:54:00 to 06-FEB-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One foot of snow estimated by trail runner/weather spotter near Junipero Serra Peak.

Winter Weather in SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST, CALIFORNIA
From 06-FEB-19 07:56:00 to 06-FEB-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimate of 8 inches of snow on Cone Peak from trail runner/weather spotter.

Winter Weather in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 06-FEB-19 07:57:00 to 06-FEB-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Three inches of snow on Mt Umunhum.

Astronomical Low Tide in MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL PARK, CALIFORNIA
From 06-FEB-19 07:58:00 to 06-FEB-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Three inches of snow reported on Fremont Peak.

Winter Weather in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 06-FEB-19 08:00:00 to 06-FEB-19 08:02:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two inches of snow in the Santa Cruz Mountains near Boulder Peak.

Winter Weather in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 06-FEB-19 08:01:00 to 06-FEB-19 08:03:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Around 1 inch of snow on highway 17 and Summit Rd.