A mid/upper level low moved through the region at the end of November. A cool unstable air mass allowed for the development of scattered thunderstorms across the region that produced lightning and small hail. An associated surface low approached the coast during this time causing high surf and gusty winds. Some locations saw wave heights above 25 feet. This system caused roadway flooding, minor debris flows, and downed trees along with damage from gusty winds.

Hail in MONTEREY, CALIFORNIA
From 29-NOV-18 05:00:00 to 29-NOV-18 05:10:00 (PST-8)
Location: (MRY)MONTEREY ARPT
Magnitude: 0.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

BB sized hail reported at the NWS office.

Hail in SAN FRANCISCO, CALIFORNIA
From 29-NOV-18 07:00:00 to 29-NOV-18 07:15:00 (PST-8)
Location: SAN FRANCISCO
Magnitude: 0.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Dime-sized hail reported on the San Francisco Peninsula https://sanfrancisco.cbslocal.com/2018/11/29/potent-storm-brings-heavy-rain-pounding-surf-high-winds-and-flooding/.

Heavy Rain in ALAMEDA, CALIFORNIA
From 29-NOV-18 00:00:00 to 29-NOV-18 00:00:00 (PST-8)
Location: EMERYVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain causes a section of the roof at a West Oakland warehouse to cave in overnight. Timing of event is uncertain https://sanfrancisco.cbslocal.com/2018/11/29/potent-storm-brings-heavy-rain-pounding-surf-high-winds-and-flooding/.

Flood in SANTA CLARA, CALIFORNIA
From 29-NOV-18 02:02:00 to 29-NOV-18 03:00:00 (PST-8)
Location: BURBANK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The Alameda was closed overnight as heavy rain flooded the railway crossing beneath the Stockton Bridge. A water rescue was called in as a vehicle with one occupant was stranded in knee deep water https://sanfrancisco.cbslocal.com/2018/11/29/potent-storm-brings-heavy-rain-pounding-surf-high-winds-and-flooding/.

Flood in SAN FRANCISCO, CALIFORNIA
From 28-NOV-18 22:19:00 to 28-NOV-18 22:49:00 (PST-8)
Location: SAN FRANCISCO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water on all lanes.

Flood in SAN FRANCISCO, CALIFORNIA
From 28-NOV-18 22:24:00 to 28-NOV-18 22:54:00 (PST-8)
Location: OCEAN VIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two feet of water across the road.

Flood in SAN FRANCISCO, CALIFORNIA
From 28-NOV-18 22:28:00 to 28-NOV-18 22:58:00 (PST-8)
Location: OCEAN VIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flood in SAN FRANCISCO, CALIFORNIA
From 28-NOV-18 22:50:00 to 28-NOV-18 23:20:00 (PST-8)
Location: SAN FRANCISCO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Market and Church St flooded intersection.

Flood in SONOMA, CALIFORNIA
From 29-NOV-18 00:03:00 to 29-NOV-18 00:33:00 (PST-8)
Location: FETTERS HOT SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flood in MONTEREY, CALIFORNIA
From 29-NOV-18 04:11:00 to 29-NOV-18 04:41:00 (PST-8)
Location: (MRY)MONTEREY ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding at Hwy1 and Hwy 68.

Flood in SAN MATEO, CALIFORNIA
From 29-NOV-18 06:10:00 to 29-NOV-18 06:40:00 (PST-8)
Location: WOODSIDE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SB 280 at Woodside 3-4 lane, major flooding low spot in roadway. DOT unable to drain, placed cones and signs.

Flood in NAPA, CALIFORNIA
From 29-NOV-18 06:42:00 to 29-NOV-18 07:22:00 (PST-8)
Location: WEST NAPA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Golden Gate Dr in Napa area.

Flood in ALAMEDA, CALIFORNIA
From 29-NOV-18 16:13:00 to 29-NOV-18 16:43:00 (PST-8)
Location: SUNOL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding on SB I-680 at Koopman Rd.

High Surf in SAN FRANCISCO PENINSULA COAST, CALIFORNIA
From 28-NOV-18 09:01:00 to 28-NOV-18 09:06:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thirty foot monster waves reported at Mavericks Wednesday morning.

Debris Flow in SANTA CRUZ, CALIFORNIA
From 28-NOV-18 21:24:00 to 28-NOV-18 21:54:00 (PST-8)
Location: MISSION SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SB 17 at Sugarloaf Rd 6 inches accumulating into number 2 lane.

High Wind in NORTH BAY MOUNTAINS, CALIFORNIA
From 28-NOV-18 21:30:00 to 28-NOV-18 21:35:00 (PST-8)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station, 5 SSW Middletown.

High Wind in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 28-NOV-18 22:30:00 to 28-NOV-18 22:35:00 (PST-8)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station, 2 miles W Mill Valley.

High Wind in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 28-NOV-18 23:45:00 to 28-NOV-18 23:50:00 (PST-8)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in NORTH BAY INTERIOR VALLEYS, CALIFORNIA
From 29-NOV-18 00:07:00 to 29-NOV-18 00:12:00 (PST-8)
Magnitude: 49.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree fell on pickup truck.

Debris Flow in NAPA, CALIFORNIA
From 29-NOV-18 02:56:00 to 29-NOV-18 03:26:00 (PST-8)
Location: WOODLEAF
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rockslide entire sb lane.

Strong Wind in SAN FRANCISCO BAY SHORELINE, CALIFORNIA
From 29-NOV-18 11:40:00 to 29-NOV-18 11:45:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Tree down in Oakland on McArthur Blvd.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 29-NOV-18 11:45:00 to 29-NOV-18 11:50:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Trees and power lines down in Ben Lomond.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 29-NOV-18 14:00:00 to 29-NOV-18 14:05:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Tree fell on minivan on Empire Grade. One person minor injuries.

Strong Wind in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 29-NOV-18 07:00:00 to 29-NOV-18 07:20:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Gust of 45 mph reported at Point Reyes.

Strong Wind in NORTH BAY MOUNTAINS, CALIFORNIA
From 29-NOV-18 00:36:00 to 29-NOV-18 01:36:00 (PST-8)
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Middle Peak RAWS station reported gusts.

Strong Wind in NORTH BAY MOUNTAINS, CALIFORNIA
From 29-NOV-18 01:29:00 to 29-NOV-18 10:29:00 (PST-8)
Magnitude: 48.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Atlas Peak RAWS reported wind gusts between 45 and 61 mph.

Strong Wind in SAN FRANCISCO PENINSULA COAST, CALIFORNIA
From 28-NOV-18 22:15:00 to 28-NOV-18 22:35:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Half Moon Bay Airport reported wind gusts 45 mph.

Strong Wind in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 29-NOV-18 07:57:00 to 29-NOV-18 08:02:00 (PST-8)
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Wind in EAST BAY HILLS AND THE DIABLO RANGE, CALIFORNIA
From 29-NOV-18 08:45:00 to 29-NOV-18 09:45:00 (PST-8)
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Gusts of 48 mph at Los Vaqueros RAWS.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 28-NOV-18 22:32:00 to 29-NOV-18 01:32:00 (PST-8)
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Los Gatos RAWS measured 45-51 mph gusts.

Strong Wind in SANTA CRUZ MOUNTAINS, CALIFORNIA
From 29-NOV-18 07:32:00 to 29-NOV-18 09:32:00 (PST-8)
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Los Gatos RAWS measured 50-54 mph gusts.

Strong Wind in SAN FRANCISCO BAY SHORELINE, CALIFORNIA
From 28-NOV-18 22:56:00 to 28-NOV-18 23:00:00 (PST-8)
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Gusts of 45 mph recorded at KSFO.

High Surf in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 29-NOV-18 20:30:00 to 29-NOV-18 20:40:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Buoy at Point Reyes reported 22 ft waves.

High Surf in COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE, CALIFORNIA
From 29-NOV-18 20:00:00 to 30-NOV-18 01:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Buoy at Point Reyes reported waves of over 20 ft.

High Surf in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 29-NOV-18 23:30:00 to 29-NOV-18 23:40:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

West Monterey Bay Buoy reported 22 ft waves.

High Surf in SOUTHERN MONTEREY BAY AND BIG SUR COAST, CALIFORNIA
From 29-NOV-18 13:00:00 to 30-NOV-18 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

West Monterey Bay buoy reported waves of over 20 ft.