Sub-tropical jet stream aided in advecting sub-tropical moisture plume from over the Central Pacific into the California Coast starting March 9th through the 11th. This led to widespread flooding around the CWA, numerous landslides, sharp rises in rivers in Monterey County, and widespread power outages from downed trees and powerlines due to strong, gusty winds. Widespread wind gusts 45 to 55 mph were reported on the evening of the 9th and into the early hours of the 10th. Heavy rains during the same time flooded numerous streams, creeks, rivers, and roads. 4-7 inches of rain fell across the Santa Cruz Mountains while 5-10 inches of rain fell on the Santa Lucia Mountains.

Flood in ALAMEDA, CALIFORNIA
From 10-MAR-23 03:15:00 to 10-MAR-23 03:15:00 (PST-8)
Location: ELMHURST
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The roof of a warehouse on 650 85th Ave in Oakland collapsed at 3:20 AM. A 57-year old man was struck by falling debris and died; a woman suffered a broken nose. KTVU television reported that city inspectors found that water had been ponding on the roof and drains were not properly cleaned.

High Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 09-MAR-23 21:32:00 to 09-MAR-23 21:32:00 (PST-8)
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Los Gatos RAWS reported a 79 mph wind gust.

Heavy Rain in ALAMEDA, CALIFORNIA
From 10-MAR-23 03:15:00 to 10-MAR-23 03:15:00 (PST-8)
Location: ELMHURST
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The roof of a warehouse on 650 85th Ave in Oakland collapsed at 3:20 AM. A 57-year old man was struck by falling debris and died; a woman suffered a broken nose. KTVU television reported that city inspectors found that water had been ponding on the roof and drains were not properly cleaned.

Heavy Rain in SONOMA, CALIFORNIA
From 09-MAR-23 22:29:00 to 09-MAR-23 22:29:00 (PST-8)
Location: SHERIDAN
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Law Enforcement

CHP reported a mud slide moving debris on California Highway 116.

Heavy Rain in MARIN, CALIFORNIA
From 10-MAR-23 00:22:00 to 10-MAR-23 00:22:00 (PST-8)
Location: SAUSALITO
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Law Enforcement

CHP reported a large land slide blocking southbound lanes of US Highway 101 near the Waldo Grade.

Flood in MONTEREY, CALIFORNIA
From 10-MAR-23 00:00:00 to 14-MAR-23 00:00:00 (PST-8)
Location: PAJARO
Flood cause: Dam / Levee Break
Property damage: 0.01K
Crop damage: 0.00K
Reported by: County Official

A levee on the Pajaro River east of the community of Pajaro was overtopped overnight, and subsequently failed, flooding the community of Pajaro and surrounding farmland. The area was evacuated, with residents only able to return after two weeks.

Flood in MONTEREY, CALIFORNIA
From 10-MAR-23 06:57:00 to 10-MAR-23 10:32:00 (PST-8)
Location: CHUALAR
Flood cause: Heavy Rain
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Law Enforcement

US Highway 101 near Chualar flooded, causing the highway to be shut down.

Heavy Rain in SANTA CLARA, CALIFORNIA
From 10-MAR-23 02:22:00 to 10-MAR-23 02:22:00 (PST-8)
Location: BURBANK
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Public

Flooding reported on the ramp from Southbound California Highway 87 to Northbound Interstate 280, with 1 foot of water over the roadway.

Strong Wind in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 09-MAR-23 22:00:00 to 10-MAR-23 09:40:00 (PST-8)
Magnitude: 39.00 EG
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Law Enforcement

Del Monte Avenue was closed between Sloat Ave and Casa Verde Rd due to downed trees and power lines, causing power outages across the Monterey Peninsula. Some areas in Del Monte Forest and Pacific Grove did not get power back on for around 2 to 3 days.

High Wind in EAST BAY HILLS, CALIFORNIA
From 09-MAR-23 21:20:00 to 09-MAR-23 21:20:00 (PST-8)
Magnitude: 75.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

The Mines Tower site operated by PGE reported an 86 mph wind gust.

High Wind in MARIN COASTAL RANGE, CALIFORNIA
From 09-MAR-23 19:40:00 to 09-MAR-23 19:40:00 (PDT-7)
Magnitude: 72.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

The Road to Ranches station operated by PGE reported an 83 mph wind gust.

High Wind in NORTH BAY INTERIOR VALLEYS, CALIFORNIA
From 09-MAR-23 21:27:00 to 09-MAR-23 21:27:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter around 1 mile south of Sausalito reported a gust of 65 mph.

Flood in SANTA CRUZ, CALIFORNIA
From 10-MAR-23 08:34:00 to 10-MAR-23 08:34:00 (PST-8)
Location: SOQUEL
Flood cause: Heavy Rain
Property damage: 0.01K
Crop damage: 0.00K
Reported by: Law Enforcement

North Main Street in Soquel was completely washed out near Pringle Lane, after heavy rain caused debris to block the Bates Creek culvert. A temporary repair was put into place on March 11.

Flood in SANTA CLARA, CALIFORNIA
From 10-MAR-23 08:55:00 to 10-MAR-23 08:55:00 (PST-8)
Location: CARNADERO
Flood cause: Heavy Rain
Property damage: 0.01K
Crop damage: 0.00K
Reported by: NWS Employee

US Highway 101 was shut down south of Gilroy due to flooding on the roadway.