A low pressure system moving in from the Gulf of Alaska and drawing in moisture from the tropics combined to bring the first atmospheric river event of the winter season to the Greater Bay Area. This system brought widespread heavy rainfall, roadway flooding, and strong winds to the region. Rare Storm Warnings were issued over the coastal waters where buoys reported wind gusts in excess of 50 mph. Bay Area peaks recorded wind gusts between 60 to 70 mph with gusts along the Monterey Peninsula and Big Sur Coast at 50 to 60 mph. These winds caused downed trees and power outages across the area. Additionally, convection associated wit the main low caused severe flooding in the city of Chualar where homes were flooded. and cars were stranded on a flooded highway.

Flood in MONTEREY, CALIFORNIA
From 01-DEC-19 13:15:00 to 01-DEC-19 13:45:00 (PST-8)
Location: WELBY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Northbound lane of Hwy 101 is flooded.

Flood in SANTA CRUZ, CALIFORNIA
From 01-DEC-19 13:45:00 to 01-DEC-19 14:15:00 (PST-8)
Location: CLIFFSIDE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Roadway flooded at intersection of East Cliff Dr and Coastview Dr.

Flood in ALAMEDA, CALIFORNIA
From 05-DEC-19 21:52:00 to 05-DEC-19 22:22:00 (PST-8)
Location: ALAMEDA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hwy 880 just south of Market St off ramp, lanes 3 and 4 flooded.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 01-DEC-19 04:22:00 to 01-DEC-19 04:28:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree down blocking half of the northbound lane of SR 35 at Bear Creek Rd.

Flood in MONTEREY, CALIFORNIA
From 01-DEC-19 14:41:00 to 01-DEC-19 15:11:00 (PST-8)
Location: PRUNEDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding in the slow lane of 101 at the intersection of 156.

Flood in MONTEREY, CALIFORNIA
From 01-DEC-19 15:00:00 to 01-DEC-19 15:30:00 (PST-8)
Location: (SNS)SALINAS ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding in the number 2 lane of 101 SE of Salinas.

Flood in MARIN, CALIFORNIA
From 01-DEC-19 16:24:00 to 01-DEC-19 16:54:00 (PST-8)
Location: MARINWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding at the end of southbound off ramp on 101, 4 inches of standing water.

High Wind in SAN FRANCISCO PENINSULA COAST, CALIFORNIA
From 01-DEC-19 05:50:00 to 01-DEC-19 06:00:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree down with branches blocking one lane at I-280 S and Hickey Blvd off ramp.

Strong Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 07:02:00 to 01-DEC-19 07:07:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Branches and debris in lane of Blanco Rd near Cooper Rd intersection.

High Wind in SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST, CALIFORNIA
From 01-DEC-19 00:00:00 to 01-DEC-19 21:50:00 (PST-8)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) on Old Coast Tower recorded sustained winds between 30 to 40 mph with gusts of 50 to 60 mph during this entire time frame with a peak gust of 72 mph at 09:50 AM PST on the 1st.

Flood in SANTA CLARA, CALIFORNIA
From 01-DEC-19 18:10:00 to 01-DEC-19 18:40:00 (PST-8)
Location: LICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding in number 2 lane of 101 over 4 inches in depth.

Flood in MONTEREY, CALIFORNIA
From 02-DEC-19 05:34:00 to 02-DEC-19 06:04:00 (PST-8)
Location: SALINAS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hwy 101 northbound lanes standing water.

Flood in MARIN, CALIFORNIA
From 02-DEC-19 07:31:00 to 02-DEC-19 08:01:00 (PST-8)
Location: OLEMA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hwy 1 northbound lane is totally flooded.

Flood in SANTA CLARA, CALIFORNIA
From 02-DEC-19 09:29:00 to 02-DEC-19 09:59:00 (PST-8)
Location: CAMBRIAN PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SB hwy 17 at Hamilton Ave, 2 right lanes are flooding on the on ramp.

Flood in MONTEREY, CALIFORNIA
From 02-DEC-19 12:37:00 to 02-DEC-19 13:07:00 (PST-8)
Location: SPENCE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

NB Hwy 101 at Esperanza Rd, number 2 lane is completely flooded and number 1 lane will be soon.

Flood in MONTEREY, CALIFORNIA
From 02-DEC-19 14:23:00 to 02-DEC-19 14:53:00 (PST-8)
Location: PRUNEDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blackie Rd between hwy 183 and Borromeo Dr flooding.

Flood in MONTEREY, CALIFORNIA
From 02-DEC-19 15:11:00 to 02-DEC-19 15:41:00 (PST-8)
Location: CAMP MC CALLUM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Alisal Rd and Hartnell Rd closed due to flooding.

Flood in MONTEREY, CALIFORNIA
From 02-DEC-19 15:47:00 to 02-DEC-19 16:17:00 (PST-8)
Location: SANTA RITA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Russell Rd at Harrison Rd cars unable to drive safely through water.

Flood in MONTEREY, CALIFORNIA
From 04-DEC-19 15:11:00 to 04-DEC-19 15:41:00 (PST-8)
Location: CHUALAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

CHP reports that Hwy 101 is under 3 feet of water and is being closed near Esperanze Rd and the City of Chualar.

Flood in MONTEREY, CALIFORNIA
From 04-DEC-19 16:50:00 to 04-DEC-19 17:20:00 (PST-8)
Location: GONZALES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Gonzales Fire reporting 4-5 cars stuck in 3-4 feet of water on US 101-N and Gloria Rd.

Flood in MONTEREY, CALIFORNIA
From 04-DEC-19 18:00:00 to 04-DEC-19 18:30:00 (PST-8)
Location: CHUALAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Monterey County OES reporting 5 to 10 homes flooded in Chualar over the course of the afternoon and evening.

Flood in MARIN, CALIFORNIA
From 01-DEC-19 01:13:00 to 01-DEC-19 01:43:00 (PST-8)
Location: CARTE MADERA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One foot of standing water at 53 San Clemente Dr.

High Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 02:39:00 to 01-DEC-19 02:44:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree in roadway blocking northbound lane of Hwy 1.

Strong Wind in SAN FRANCISCO PENINSULA COAST, CALIFORNIA
From 01-DEC-19 04:16:00 to 01-DEC-19 04:21:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree branches and wood in southbound lanes near intersection of Hwy 1 and Linda Mar Blvd.

Debris Flow in SONOMA, CALIFORNIA
From 01-DEC-19 04:18:00 to 01-DEC-19 04:48:00 (PST-8)
Location: MARK WEST SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large rocks in roadway near intersection of Porter Creek Rd and Cresta Rd.

Flood in SANTA CLARA, CALIFORNIA
From 01-DEC-19 05:27:00 to 01-DEC-19 05:57:00 (PST-8)
Location: CHEMEKETA PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One foot of water in number 2 lane of northbound Hwy 17 junction with cats statues off ramp.

Flood in SANTA CRUZ, CALIFORNIA
From 01-DEC-19 05:52:00 to 01-DEC-19 06:22:00 (PST-8)
Location: MISSION SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Standing water on southbound 17 at Bear Creek Rd.

High Wind in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 01-DEC-19 06:10:00 to 01-DEC-19 06:15:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree blocking both lanes of Hwy 1.

Debris Flow in SONOMA, CALIFORNIA
From 01-DEC-19 06:33:00 to 01-DEC-19 07:03:00 (PST-8)
Location: RIO NIDO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rocks in both lanes on River Rd near intersection with Rio Nido Rd.

High Wind in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 01-DEC-19 06:34:00 to 01-DEC-19 06:39:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree in roadway on westbound Dillon Beach Rd near intersection with Middle Rd.

Debris Flow in SONOMA, CALIFORNIA
From 01-DEC-19 06:56:00 to 01-DEC-19 07:26:00 (PST-8)
Location: JIMTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rock slide blocking both lanes at 2364 Geysers Rd.

Strong Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 07:13:00 to 01-DEC-19 07:18:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines down across the road at 17 Mentone Rd.

Strong Wind in NORTH BAY INTERIOR VALLEYS, CALIFORNIA
From 01-DEC-19 07:19:00 to 01-DEC-19 07:24:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree down across roadway with power line on right hand side of Old River Rd near Bonita Ave.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 01-DEC-19 07:35:00 to 01-DEC-19 07:40:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree down blocking both lanes of Alma Bridge Rd off ramp at highway 17.

Debris Flow in SANTA CRUZ, CALIFORNIA
From 01-DEC-19 07:50:00 to 01-DEC-19 08:20:00 (PST-8)
Location: PERMANENTE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Boulders blocking entire roadway SR 35 junction with SR 9.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 01-DEC-19 12:07:00 to 01-DEC-19 12:12:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree in northbound lane of Mountain Charlie Road.

Debris Flow in SONOMA, CALIFORNIA
From 01-DEC-19 12:16:00 to 01-DEC-19 12:46:00 (PST-8)
Location: MIRABELL PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Mudslide and debris in area of Westside Rd.

Debris Flow in SANTA CRUZ, CALIFORNIA
From 01-DEC-19 13:09:00 to 01-DEC-19 13:39:00 (PST-8)
Location: MISSION SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Mudslide in number 2 lane of CA 17.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 01-DEC-19 14:32:00 to 01-DEC-19 14:37:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree down in the south bound lane of CA-17.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 01-DEC-19 15:22:00 to 01-DEC-19 15:27:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large oak down in southbound lane of CA-17.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 01-DEC-19 15:37:00 to 01-DEC-19 15:42:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree blocking both lanes of Glen Canyon Rd.

Debris Flow in SONOMA, CALIFORNIA
From 01-DEC-19 15:46:00 to 01-DEC-19 16:16:00 (PST-8)
Location: JIMTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rock blocking westbound lane of 128.

Strong Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 16:10:00 to 01-DEC-19 16:15:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large boulder in northbound lane of Hwy 1.

High Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 17:50:00 to 01-DEC-19 17:55:00 (PST-8)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station on Old Coast Tower.

Debris Flow in MONTEREY, CALIFORNIA
From 01-DEC-19 19:14:00 to 01-DEC-19 19:44:00 (PST-8)
Location: CARMEL VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large boulders 2 feet across in both north and southbound lanes of Hwy 1.

Strong Wind in NORTH BAY MOUNTAINS, CALIFORNIA
From 01-DEC-19 03:33:00 to 01-DEC-19 04:33:00 (PST-8)
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Oak Ridge station.

Strong Wind in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 01-DEC-19 15:28:00 to 01-DEC-19 16:28:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Las Trampas.

Strong Wind in NORTHERN SALINAS VALLEY / HOLLISTER VALLEY / CARMEL VALLEY, CALIFORNIA
From 01-DEC-19 07:15:00 to 01-DEC-19 07:25:00 (PST-8)
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Salinas Airport ASOS recorded wind gusts between 46 and 51 mph.

Strong Wind in MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL PARK, CALIFORNIA
From 02-DEC-19 04:40:00 to 02-DEC-19 05:00:00 (PST-8)
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) on San Juan Grade.

High Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 06:30:00 to 01-DEC-19 06:40:00 (PST-8)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) on Coast Road.

Strong Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 01-DEC-19 00:00:00 to 02-DEC-19 04:00:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station (PG&E) on Coast Road measured gusts over 45 mph with wind speaking at 62 mph.

Flood in MONTEREY, CALIFORNIA
From 02-DEC-19 04:00:00 to 03-DEC-19 01:00:00 (PST-8)
Location: CARMEL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Carmel River Lagoon rose significantly overnight after 3 to 5 inches of rain fell over the Carmel River Basin. The Monterey OES phoned to say Public Works tried to breach the Lagoon and was unable to do so in time so the surrounding area had to be evacuated due to flooding. Minor Street flooding was observed along 15th, 16th, 17th Ave as well as Carmelo St and Scenic Rd. The unofficial flood stage of the Carmel River Lagoon is 10 ft. The gauge exceeded 10 ft during this time period before the Lagoon was breached and the water level fell dramatically just after 1 am.