Debris Flow and Flooding in California, February 6 to 9, 2015

Name: Debris Flow and Flooding in California, February 6 to 9, 2015
Start: 2015-02-06T09:23
End: 2015-02-09T04:25
Location: California

February 6 to 9, 2015 · NWS MTR · 74 events in 19 counties and zones

Where it happened

Every event with a place to put it; 39 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $124,000
Crop damage: None recorded
Events: 74

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS MTR wrote it up.

A strong winter storm finally impacted California following up on nearly a month and a half of no rain and the driest January on record. The storm brought heavy rain, gusty winds, and damage to trees and power lines along with some minor flooding of urban areas. Rainfall amounts were heaviest in the mountains with 5-10 inches or more occurring. Generally 1-3.5 inches fell in low elevation areas and urban spots, with less than an inch in Southern Monterey County. Winds gusted 50-70 MPH with the highest gusts in the mountains of the region. Several small mudslides were reported with the largest occurring in the Santa Cruz Mountains north of Boulder Creek on Highway 9.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Francisco Bay Area, CA wrote its last area forecast discussion before the first event at Feb 6, 4:43 AM PST, 4 hours 40 minutes earlier.

Area forecast discussion, Feb 6, 4:43 AM PST, 4 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
443 AM PST FRI FEB 6 2015

.SYNOPSIS...RAIN IN THE NORTH BAY THIS MORNING WILL SLOWLY WORK
ITS WAY SOUTHWARD INTO THE GREATER BAY AREA BY THIS AFTERNOON.
MODERATE TO HEAVY RAIN WILL IMPACT THE FRIDAY AFTERNOON AND
EVENING COMMUTE FOR THE BAY AREA WITH RAIN CONTINUING FOR MUCH OF
FRIDAY NIGHT. SHOWERS ON SATURDAY MORNING WILL GRADUALLY DECREASE
BY MIDDAY WITH SOME BREAKS IN THE CLOUDS. ANOTHER STORM WILL
ARRIVE SUNDAY BRINGING ANOTHER ROUND OF RAIN THAT WILL TAPER TO
SHOWERS BY MONDAY. DRY WEATHER RETURNS TUESDAY AND CONTINUES
THROUGH NEXT WEEK.

&&

.DISCUSSION...AS OF 4:15 AM PST FRIDAY...INCOMING STORM SYSTEM
REMAINS ON TRACK WITH NO MAJOR DEVIATIONS FROM PREVIOUS FORECAST.
SO FAR RAIN REMAINS CONFINED TO THE NORTH BAY AND AT THIS HOUR THE
STEADY RAIN IS FALLING ACROSS NORTHERN SONOMA COUNTY. THE SEA
RANCH ALONG THE SONOMA COAST IS UP TO 0.57 WITH 0.32 AT VENADO AND
CAZADERO AND 0.21 AT THE HAWKEYE RAWS SITE. LIGHT RAIN HAS BEEN
REPORTED AT UKIAH AND SANTA ROSA FOR SEVERAL HOURS OVERNIGHT WITH
6 HOUR RAIN TOTALS OF 0.48 AND 0.05.

AS IS ALMOST ALWAYS THE CASE IN THESE STRONG WARM FRONTAL EPISODES
THE FRONT WILL ONLY SLOWLY MOVE SOUTHWARD AS STRONG SOUTHERLY
WIND FLOW CONTINUES ACROSS THE REGION. GALE FORCE GUSTS HAVE BEEN
OBSERVED AT THE HALF MOON BAY AND BODEGA BAY BUOYS THE LAST HOUR
WITH GUSTY SOUTHERLY WINDS BEING OBSERVED THROUGHOUT THE BAY AREA.
GUSTS TO 50 MPH OR HIGHER HAVE BEEN CONFINED TO POINT REYES AND MT
DIABLO. WIND ADVISORY REMAINS IN EFFECT THROUGH 4 AM SATURDAY AND
THE NORTHERN SALINAS VALLEY WAS ADDED TO THE ADVISORY. IT APPEARS
THE AFTERNOON AND EVENING HOURS OF TODAY IS WHEN THE STRONGEST
WINDS WILL OCCUR AS THE BOUNDARY SAGS FARTHER SOUTH AND JET
ENERGY ALOFT PASSES OVER THE REGION WITH HEAVY RAIN DRAGGING SOME
OF THE HIGH MOMENTUM AIR CLOSER TO THE SURFACE.

IN TERMS OF TIMING THE RAINFALL...EXPECT THE RAIN TO ONLY IMPACT
THE NORTH BAY THIS MORNING OUTSIDE OF A FEW WARM ADVECTION SCOUT
SHOWERS OR SPRINKLES SOUTH OF THE GOLDEN GATE. LATEST MESOSCALE
MODELS THEN PUSH THE FRONTAL BOUNDARY SOUTHWARD INTO THE GREATER
BAY AREA BY AROUND 21Z THIS AFTERNOON AS A SURFACE LOW TRACKS
TOWARDS CAPE MENDOCINO. LOOKING LIKE THE AFTERNOON COMMUTE WILL
GET NASTY IN A HURRY WITH MODERATE TO HEAVY RAIN FOR THE LATE
AFTERNOON AND EVENING HOURS ACROSS THE BAY AREA AND EVENTUALLY
OVERSPREADING THE MONTEREY BAY REGION AS WELL. MODERATE TO HEAVY
RAIN CONTINUES BAY AREA WIDE FOR FRIDAY NIGHT ACTIVITIES.

RAIN TAPERS TO SHOWERS IN THE PRE-DAWN HOURS OF SATURDAY MORNING
SO WILL LEAVE NORTH BAY FLASH FLOOD WATCH AS IS THROUGH 6 AM
SATURDAY WITH EXPECTATION THAT SOME URBAN AND SMALL STREAM FLOOD
ADVISORIES MAY NEED TO BE ISSUED LATER THIS AFTERNOON AND EVENING.

PRECIP WILL STAY IN THE FORECAST FOR SATURDAY BUT THERE WILL BE
BREAKS IN THE CLOUDS AND WET PERIODS WITH EVEN SOME PEEKS OF
SUNSHINE EXPECTED AS TEMPERATURES REMAIN MILD IN THE 60S.

DETAILS OF SYSTEM NUMBER TWO REMAIN SOMEWHAT LOW CONFIDENCE AS THE
NAM MODEL FOCUSES MOST OF THE MOISTURE OVER THE NORTH BAY AND
HOLDS OFF UNTIL SUNDAY AFTERNOON. THE GFS ON THE OTHER HAND
SUGGESTS RAIN ON AND OFF THROUGH THE DAY SUNDAY WITH SOME OF THE
HEAVIER RAIN FOCUSED OVER THE CENTRAL COAST WHICH IS ALSO
SUPPORTED BY THE ECMWF.

ANY STEADY RAIN ENDS SUNDAY NIGHT BUT SIMILAR TO SATURDAY DO EXPECT
SHOWERS TO LINGER INTO MONDAY.

STRONG MODEL CONSENSUS FOR A RIDGE OF HIGH PRESSURE TUESDAY
THROUGH FRIDAY OF NEXT WEEK WITH MOSTLY CLEAR SKIES AND ABOVE
NORMAL TEMPERATURES.

&&

.AVIATION...AS OF 9:55 PM PST THURSDAY...A POWERFUL PACIFIC STORM
WILL BRING WET AND WINDY CONDITIONS BEGINNING TODAY. EXPECT
SIGNIFICANT DETERIORATION IN FLIGHT CONDITIONS THIS MORNING. CIGS
WILL GRADUALLY DESCEND TO MVFR/IFR LEVELS BY EARLY AFTERNOON.
MVFR/IFR VISBYS WILL ACCOMPANY MODERATE TO HEAVY RAIN MID DAY AND
THUS WET RUNWAYS. GUSTY SOUTH TO SOUTHEAST WINDS WILL BE BETWEEN 25 AND
35 KT SUSTAINED WITH POTENTIAL FOR GUSTS BETWEEN 40 AND 50 KT. LOW
LEVEL SPEED SHEAR SHOULD ALSO BE MONITORED. ADDITIONALLY... A FEW
LIGHTNING STRIKES HAVE BEEN OBSERVED OFF OF THE NORTHERN
CALIFORNIA COAST THIS MORNING... AND THERE IS A SLIGHT RISK OF
THUNDERSTORMS OVER THE NORTH BAY TONIGHT. SATURDAY LOOKS LIKE THE
BEST CHANCE TO SEE A TEMPORARY BREAK IN THE RAIN BEFORE A SECOND
SYSTEM ARRIVES EARLY SUNDAY.

VICINITY OF KSFO...AIRPORT WEATHER WARNING IN EFFECT FOR STRONG
WINDS THROUGH 03Z SAT. PRECURSOR LIGHT RAIN SHOWERS ARE ALREADY
ARRIVING OVER THE BAY AREA THIS MORNING. GUSTY SOUTHEAST WINDS
WILL SLOWLY VEER TOWARDS THE SOUTH TODAY. GUSTS UP TO 45 KT ARE
POSSIBLE. HEAVIEST RAIN EXPECTED BETWEEN 20-24Z FRIDAY. MVFR/IFR
CIGS/VISBY BY 18Z.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...SALINAS VALLEY WILL BE VERY GUSTY
TODAY... ESPECIALLY AFTER 21Z. HEAVIEST RAIN EXPECTED TO ARRIVE
BETWEEN 03-08Z SATURDAY.  MVFR/IFR CIGS/VISBYS AFTER 21Z TODAY.

CONFIDENCE IS MODERATE.

&&

.MARINE...AS OF 04:27 AM PST FRIDAY...STRONG SOUTHERLY WINDS
STRENGTHEN TODAY WITH GALE FORCE WINDS EXPECTED ACROSS THE COASTAL
WATERS TODAY AND INTO TONIGHT. LOCAL STORM FORCE GUSTS ARE
POSSIBLE... ESPECIALLY IN THE NORTHERN WATERS. THESE STRONG WINDS
WILL GENERATE LARGE...STEEP SEAS. WINDS WILL EASE BY SATURDAY
MORNING BEFORE INCREASING ONCE AGAIN ON SATURDAY NIGHT AND SUNDAY
AS ANOTHER STORM SYSTEM APPROACHES THE COAST.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TDAY...WIND ADVISORY...ALL AREAS EXCEPT INLAND PORTIONS OF
                             MONTEREY AND SAN BENITO COUNTIES.
             FLASH FLOOD WATCH...MARIN...SONOMA...NAPA COUNTIES.
             SCA...SF BAY NORTH OF THE BAY BRIDGE UNTIL 9 AM
             SCA...SF BAY SOUTH OF THE BAY BRIDGE UNTIL 9 AM
             SCA...PIGEON PT TO PT PINOS 0-10 NM UNTIL 9 AM
             SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM UNTIL 9 AM
             GLW...SF BAY NORTH OF THE BAY BRIDGE FROM 9 AM
             GLW...PIGEON PT TO PT PINOS 0-10 NM FROM 9 AM
             GLW...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM FROM 9 AM
             GLW...PT ARENA TO PT REYES 0-10 NM
             GLW...PT ARENA TO PT REYES 10-60 NM
             GLW...PT REYES TO PIGEON PT 10-60 NM
             GLW...PIGEON PT TO PT PINOS 10-60 NM
             GLW...PT PINOS TO PT PIEDRAS BLANCAS 10-60 NM
             SCA...PT REYES TO PIGEON PT 0-10 NM UNTIL 6 AM
             SCA...ROUGH BAR ADVISORY FOR SF BAR
             GLW...PT REYES TO PIGEON PT 0-10 NM
             SCA...MONTEREY BAY
             GLW...SF BAY SOUTH OF THE BAY BRIDGE FROM 9 AM

&&

PUBLIC FORECAST: RWW
AVIATION/MARINE: DRP

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The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

36 strong wind, 16 heavy rain, 11 flood, 10 high wind, 1 debris flow. Local standard time, as filed.

Strong Wind, East Bay Interior Valleys

When: February 6, 9:23 AM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $500
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

California Highway Patrol reports a tree limb blown down and blocking the northbound lanes of Interstate 680 and Highway 4.

Strong Wind, Santa Cruz Mountains

When: February 6, 10:21 AM PST
Where: Santa Cruz Mountains forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.230, -122.021 (the zone’s center; the record gives no point)

Highway 9 at McGraffigan Mill Road closed due to tree in roadway for about an hour.

Strong Wind, San Francisco Bay Shoreline

When: February 6, 10:24 AM PST
Where: San Francisco Bay Shoreline forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $100
Reported by: Law Enforcement
Coordinates: 37.561, -121.980 (the zone’s center; the record gives no point)

A large palm branch was blown down across a lane of Interstate 880 North.

High Wind, North Bay Mountains

When: February 6, 10:29 AM PST
Where: North Bay Mountains forecast zone
Measured: 56 kt (64 mph) measured gust
Reported by: RAWS

A wind gust of 64 MPH was measured on the Atlas Peak RAWS at elevation 1934 feet.

Strong Wind, San Francisco

When: February 6, 10:30 AM PST
Where: San Francisco forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $200
Reported by: Law Enforcement
Coordinates: 37.778, -122.442 (the zone’s center; the record gives no point)

A large tree branch was blown down into the on ramp lane of 120 north and state road 82.

Strong Wind, North Bay Interior Valleys

When: February 6, 10:41 AM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Live wires blown down into roadways on Kent Avenue and State Route 1.

Strong Wind, Santa Clara Valley Including San Jose

When: February 6, 10:41 AM PST
Where: Santa Clara Valley Including San Jose forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.233, -121.696 (the zone’s center; the record gives no point)

Wind knocked a limb down on a power pole and then took out power to 800 customers in Los Altos at Hawthorn and El Monte.

Strong Wind, North Bay Interior Valleys

When: February 6, 10:51 AM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $500
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Large tree limb down blocking northbound lanes at Highway 1 and Valley Ford Road.

Strong Wind, Santa Clara Valley Including San Jose

When: February 6, 10:51 AM PST
Where: Santa Clara Valley Including San Jose forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.233, -121.696 (the zone’s center; the record gives no point)

A tree down onto wires across roadway wood acres road and west road.

Strong Wind, East Bay Interior Valleys

When: February 6, 10:51 AM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A tree down blocking a lane at Fairmont Rd and Foothill Blvd. The tree is 2 feet in diameter and about 50 feet tall.

Strong Wind, San Francisco Bay Shoreline

When: February 6, 10:51 AM PST
Where: San Francisco Bay Shoreline forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.561, -121.980 (the zone’s center; the record gives no point)

Large tree branch blocking 2 right lanes of Southbound Interstate 280 connector to Eastbound Interstate 380.

Strong Wind, Santa Clara Valley Including San Jose

When: February 6, 10:55 AM PST
Where: Santa Clara Valley Including San Jose forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.233, -121.696 (the zone’s center; the record gives no point)

Tree blown down onto power lines near Los Gatos.

High Wind, San Francisco Bay Shoreline

When: February 6, 11:10 AM PST
Where: San Francisco Bay Shoreline forecast zone
Measured: 54 kt (62 mph) measured gust
Reported by: Mesonet
Coordinates: 37.561, -121.980 (the zone’s center; the record gives no point)

A wind gust of 62 MPH was measured on the west side of Los Altos Hills.

High Wind, East Bay Hills and the Diablo Range

When: February 6, 11:18 AM PST
Where: East Bay Hills and the Diablo Range forecast zone
Measured: 51 kt (59 mph) measured gust
Reported by: RAWS

A gust of 59 MPH measured on the Calaveras Road RAWS at elevation 1230 ft.

Strong Wind, North Bay Interior Valleys

When: February 6, 11:36 AM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

A tree blown down blocking west bound lanes of Bohemian Highway at Occidental Camp Meeker Road.

Flood, Sonoma

When: February 6, 11:40 AM PST
Where: Sonoma County, 2.13 mi NW of Larkfield to 2.29 mi NW of Larkfield
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 38.570, -122.760

Law enforecement reports a flooded roadway along Chalk Hill Road.

Strong Wind, North Bay Interior Valleys

When: February 6, 11:40 AM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Tree blown down blocking roadway at Spring Mountain Road and Langtry Road.

Strong Wind, San Francisco Peninsula Coast

When: February 6, 11:40 AM PST
Where: San Francisco Peninsula Coast forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.229, -122.183 (the zone’s center; the record gives no point)

Large tree fell blocking 2 right lanes of Eastbound Interstate 380 to Northbound U.S. Highway 101.

Strong Wind, San Francisco

When: February 6, 11:48 AM PST
Where: San Francisco forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $3,000
Reported by: Broadcast Media
Coordinates: 37.778, -122.442 (the zone’s center; the record gives no point)

Tree down in Bernal Heights of San Francisco that took down some power lines.

Strong Wind, East Bay Interior Valleys

When: February 6, 11:48 AM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $10,000
Reported by: Broadcast Media
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

Large tree branch blown down into the parking lot of a shopping center in Alamo. No one was injured, but several cars were damaged by the branch.

Strong Wind, San Francisco Bay Shoreline

When: February 6, 11:48 AM PST
Where: San Francisco Bay Shoreline forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Broadcast Media
Coordinates: 37.561, -121.980 (the zone’s center; the record gives no point)

Power lines blown down in Oakland taking out power to over 400 people.

Strong Wind, East Bay Interior Valleys

When: February 6, 11:49 AM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A tree was blown down into the Eastbound lane of Stone Valley Road between Interstate 680 and Miranda.

Strong Wind, San Francisco Peninsula Coast

When: February 6, 11:49 AM PST
Where: San Francisco Peninsula Coast forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.229, -122.183 (the zone’s center; the record gives no point)

A tree blown down and blocking the roadway at State Route 35 and Kings Mountain Road near the community center.

Strong Wind, North Bay Interior Valleys

When: February 6, 11:52 AM PST
Where: North Bay Interior Valleys forecast zone
Measured: 43 kt (49 mph) estimated gust
Property damage: $3,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Multiple trees blown down onto Bear Valley Road about 8 Miles NW of Inverness. Northbound lanes completely blocked and southbound lanes partially blocked.

Flood, San Mateo

When: February 6, 12:31 PM PST
Where: San Mateo County, 1.75 mi N of Atherton to 1.88 mi N of Atherton
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.495, -122.232

Heavy rain resulted in flooding of Southbound US 101 offramp.

Strong Wind, North Bay Interior Valleys

When: February 6, 12:31 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

A tree was blown down blocking the eastbound lanes of State Route 116 and Duncan Mills.

Strong Wind, Santa Clara Valley Including San Jose

When: February 6, 12:31 PM PST
Where: Santa Clara Valley Including San Jose forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.233, -121.696 (the zone’s center; the record gives no point)

Branches blown down into the transfer lanes between State Route 85 and Interstate 280 about 1 mile NW of Cupertino.

High Wind, North Bay Mountains

When: February 6, 12:51 PM PST
Where: North Bay Mountains forecast zone
Measured: 56 kt (64 mph) measured gust
Reported by: RAWS

A wind gust of 65 MPH was measured on the Woodacre RAWS at elevation 1400 Feet.

High Wind, East Bay Hills and the Diablo Range

When: February 6, 1:00 PM PST
Where: East Bay Hills and the Diablo Range forecast zone
Measured: 61 kt (70 mph) estimated gust
Reported by: RAWS

A wind gust of 70 MPH measured on Mt. Diablo at elevation 3849 feet.

Strong Wind, North Bay Interior Valleys

When: February 6, 1:09 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Live wires blown down and wrapped around a car about 3 miles SW of Occidental.

Strong Wind, East Bay Interior Valleys

When: February 6, 1:12 PM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $15,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A tree blown down across multiple cars at 3225 Danville in front of a coffee shop.

Flood, Sonoma

When: February 6, 1:15 PM PST
Where: Sonoma County, 2.78 mi WSW of Geyserville to 2.76 mi WSW of Geyserville
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 38.690, -122.950

Lanes flooded on Dry Creek Road.

High Wind, San Francisco Peninsula Coast

When: February 6, 1:18 PM PST
Where: San Francisco Peninsula Coast forecast zone
Measured: 61 kt (70 mph) estimated gust
Reported by: RAWS
Coordinates: 37.229, -122.183 (the zone’s center; the record gives no point)

A wind gust of 70 MPH was measured at the Spring Valley RAWS elevation of 1075 feet.

Strong Wind, East Bay Interior Valleys

When: February 6, 1:20 PM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $15,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A tree was blown down across three vehicles and blocking the roadway at 380 Joan Vista Street.

Strong Wind, East Bay Interior Valleys

When: February 6, 1:21 PM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A tree blown down in the roadway on the 300 block of Marshall Drive and Lakewood Drive.

Strong Wind, San Francisco Peninsula Coast

When: February 6, 1:21 PM PST
Where: San Francisco Peninsula Coast forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.229, -122.183 (the zone’s center; the record gives no point)

Tree limbs blown down across the westbound lanes of State Route 92 and Quarry Road near Half Moon Bay.

Flood, Alameda

When: February 6, 1:31 PM PST
Where: Alameda County, 2.37 mi NNW of Alameda to 2.15 mi NNW of Alameda
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.803, -122.281

Roadway flooding on Westbound Interstate 980 at Southbound Interstate 880.

Flood, Napa

When: February 6, 1:31 PM PST
Where: Napa County, 7.28 mi ENE of Rutherford to 6.81 mi ENE of Rutherford
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 38.507, -122.294

Roadway flooding reported on highway 128.

Flood, San Mateo

When: February 6, 1:31 PM PST
Where: San Mateo County, 0.95 mi NW of West Menio Park to 0.91 mi NW of West Menio Park
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.461, -122.291

Flooding of number 4 lane on Southbound Interstate 280 at Canada Road.

Flood, Sonoma

When: February 6, 1:31 PM PST
Where: Sonoma County, 1.13 mi E of Valley Ford to 1.08 mi E of Valley Ford
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 38.318, -122.899

Roadway flooding reported by law enforcement.

Strong Wind, San Francisco

When: February 6, 1:31 PM PST
Where: San Francisco forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.778, -122.442 (the zone’s center; the record gives no point)

Tree blown down blocking the pedestrian walk ramp on North Geneva Avenue down to the freeway. Northbound Interstate 280 at Ocean.

Strong Wind, East Bay Interior Valleys

When: February 6, 1:31 PM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

Tree blown down across number two lane of Eastbound State Route 4 at Willow Ave.

High Wind, North Bay Mountains

When: February 6, 1:33 PM PST
Where: North Bay Mountains forecast zone
Measured: 57 kt (66 mph) measured gust
Reported by: RAWS

A wind gust of 66 MPH was measured on the Big Rock RAWS at elevation of 1500 feet.

Flood, Santa Clara

When: February 6, 1:56 PM PST
Where: Santa Clara County, 1.3 mi NNW of Campbell to 1.2 mi N of Campbell
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.318, -121.976

Car accident on Southbound Interstate 280 at South Saratoga Ave onramp due to standing water on the interstate.

Flood, Santa Clara

When: February 6, 2:05 PM PST
Where: Santa Clara County, 0.88 mi WSW of San Jose to 0.62 mi SW of San Jose
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.325, -121.895

Roadway flooding on Northbound Interstate 280 at the North Bird Ave off ramp.

Strong Wind, North Bay Interior Valleys

When: February 6, 2:05 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Tree down on the road at 13001 Bodega Highway.

Strong Wind, North Bay Interior Valleys

When: February 6, 2:05 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Several trees down in the roadway along the 3400 block of Mill Creek Road.

Flood, Santa Clara

When: February 6, 2:19 PM PST
Where: Santa Clara County, 1.72 mi E of Campbell to 1.8 mi NNW of Cambrian Park
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.295, -121.939

Number one lane of Northbound State Route 17 at the Hamilton Ave On ramp flooded.

Strong Wind, East Bay Interior Valleys

When: February 6, 2:19 PM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A 30 foot tree down and blocking the entire roadway at La Serena Way and South Avenue.

High Wind, East Bay Hills and the Diablo Range

When: February 6, 2:28 PM PST
Where: East Bay Hills and the Diablo Range forecast zone
Measured: 56 kt (64 mph) measured gust
Reported by: RAWS

A gust of 65 MPH was measured on the Las Trampas RAWS at elevation 1759 feet.

Strong Wind, East Bay Interior Valleys

When: February 6, 2:42 PM PST
Where: East Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $500
Reported by: Law Enforcement
Coordinates: 37.787, -121.934 (the zone’s center; the record gives no point)

A large tree branch was blown down into the slow lane of Eastbound Interstate 80 at Hill Top.

Strong Wind, North Bay Interior Valleys

When: February 6, 3:04 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $3,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

A large tree fell and landed on power lines and the pole broke. Fire department completely shut down Northbound lanes of Old Redwood Highway at Alba Lane and created large traffic issues.

Strong Wind, North Bay Interior Valleys

When: February 6, 3:05 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $2,000
Reported by: Law Enforcement
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Tree blown down across the roadway at Magnolia Avenue and Thompson lane about 3 miles west of Petaluma.

Flood, Santa Clara

When: February 6, 3:09 PM PST
Where: Santa Clara County, 0.63 mi NNW of Cupertino to 0.4 mi NNW of Campbell
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 37.338, -122.035

Multiple offramps from Interstate 280 reported flooded. Including Bird, Saratoga, 11th ave, and Northbound Highway 87.

High Wind, North Bay Interior Valleys

When: February 6, 3:27 PM PST
Where: North Bay Interior Valleys forecast zone
Measured: 50 kt (58 mph) measured gust
Property damage: $5,000
Reported by: Emergency Manager
Coordinates: 38.362, -122.667 (the zone’s center; the record gives no point)

Two trees were blown down on Middle Two Rock Road and one landed on a parked car. The road was closed for several hours. A wind gust of 57 MPH was measured along Middle Two Rock Road at that time.

Strong Wind, North Bay Mountains

When: February 6, 5:19 PM PST
Where: North Bay Mountains forecast zone
Measured: 39 kt (45 mph) estimated gust
Property damage: $1,000
Reported by: Law Enforcement

Highway 29 was closed in both directions after a tree fell across the entire roadway.

High Wind, Santa Cruz Mountains

When: February 6, 10:32 PM PST
Where: Santa Cruz Mountains forecast zone
Measured: 58 kt (67 mph) estimated gust
Reported by: RAWS
Coordinates: 37.230, -122.021 (the zone’s center; the record gives no point)

A wind gust of 67 MPH was measured on the Los Gatos RAWS at elevation 1841 feet.

Heavy Rain, Sonoma

When: February 8, 8:30 AM PST
Where: Sonoma County, 2.32 mi WNW of Jenner to 1.69 mi WNW of Jenner
Property damage: $25,000
Reported by: Broadcast Media
Coordinates: 38.467, -123.157

A fuel tanker crashed in heavy rain on Highway 1 North of Jenner in Sonoma County. The tanker leaked about 9,000 gallons of diesel into the ocean.

Debris Flow, Santa Cruz

When: February 9, 3:40 AM PST
Where: Santa Cruz County, 4.18 mi NNE of San Lorenzo to 4.14 mi NNE of San Lorenzo
Cause: Heavy Rain
Property damage: $10,000
Reported by: Broadcast Media
Coordinates: 37.257, -122.125

Heavy rains of the past several days triggered a large mudslide. The mudslide blocked Highway 9. The road was closed between its intersection with Highway 35 and Highway 236. The slide occurred about 3:40 AM on that Monday morning and the road remained closed through 5:00 PM that Monday evening. Rainfall in the Santa Cruz Mountains was 5-7 inches for the 72 hours preceding this mudslide.

Heavy Rain, Marin

When: February 9, 4:02 AM PST
Where: Marin County, 0.88 mi NE of Mill Vly Afs
Reported by: RAWS
Coordinates: 37.930, -122.590

A 72 Hour Rainfall Total of 4.80 inches was measured at elevation 2339 Feet on the Middle Peak RAWS.

Heavy Rain, Monterey

When: February 9, 4:02 AM PST
Where: Monterey County, 7.41 mi E of Gorda
Reported by: River/Stream Gage
Coordinates: 35.850, -121.320

Monterey County ALERT gauge on Three Peaks at Elevation 3362 feet measured a 72 hour rainfall total of 10.40 inches.

Heavy Rain, Monterey

When: February 9, 4:02 AM PST
Where: Monterey County, 8.46 mi SSE of Lucia
Reported by: River/Stream Gage
Coordinates: 36.050, -121.520

Monterey County ALERT gauge on Mining Ridge at Elevation 3288 feet measured a 72 hour rainfall total of 9.53 inches.

Heavy Rain, Monterey

When: February 9, 4:02 AM PST
Where: Monterey County, 8.37 mi N of Gorda
Reported by: River/Stream Gage
Coordinates: 35.990, -121.430

Monterey County ALERT gauge on Chalk Peak at Elevation 3432 feet measured a 72 hour rainfall total of 8.31 inches.

Heavy Rain, Napa

When: February 9, 4:02 AM PST
Where: Napa County, Angwin
Reported by: Mesonet
Coordinates: 38.570, -122.430

A 72 Hour Rainfall Total from Angwin at elevation 1714 feet of 7.24 was measured as the highest total in Napa County.

Heavy Rain, Napa

When: February 9, 4:02 AM PST
Where: Napa County, 0.88 mi SW of St Helena
Reported by: River/Stream Gage
Coordinates: 38.490, -122.480

A Napa County gauge at St. Helena on Sulphur Creek measured a 72 hour rainfall total of 5.51 inches.

Heavy Rain, San Benito

When: February 9, 4:02 AM PST
Where: San Benito County, 1.81 mi ESE of Hernandez
Reported by: RAWS
Coordinates: 36.360, -120.770

A 72 hour rainfall total of 2.41 inches was measured at the Marquez RAWS at elevation 2570 feet as the highest total in San Benito County.

Heavy Rain, San Francisco

When: February 9, 4:02 AM PST
Where: San Francisco County, 29.82 mi WSW of Crissy Aaf
Reported by: Official NWS Observations
Coordinates: 37.700, -123.001

A 72 hour rainfall total of 2.46 inches was measured on the Farallon Islands at elevation 30 feet.

Heavy Rain, San Mateo

When: February 9, 4:02 AM PST
Where: San Mateo County, Redwood City
Reported by: Mesonet
Coordinates: 37.480, -122.270

A 72 hour rainfall total of 5.43 inches was measured from Emerald Lake Hills at elevation 472 feet. This was the highest storm total in San Mateo County.

Heavy Rain, Santa Clara

When: February 9, 4:02 AM PST
Where: Santa Clara County, 3.92 mi E of Holy City
Reported by: River/Stream Gage
Coordinates: 37.160, -121.900

A gauge on Mt. Umunhum at elevation 2492 measured a 72 hour rainfall total of 10.16 inches. This was the highest reported storm total in Santa Clara County.

Heavy Rain, Santa Clara

When: February 9, 4:02 AM PST
Where: Santa Clara County, 6.32 mi S of New Almaden
Reported by: River/Stream Gage
Coordinates: 37.090, -121.800

A gauge in Uvas Canyon County Park measured a 72 hour rainfall total of 8.74 inches.

Heavy Rain, Santa Cruz

When: February 9, 4:02 AM PST
Where: Santa Cruz County, 5.86 mi NE of Mission Spgs
Reported by: Mesonet
Coordinates: 37.140, -121.970

A 72 hour rainfall total from Schulties Road at elevation 1488 feet in the Santa Cruz Mountains was measured at 7.16 inches. This was the highest storm total reported from Santa Cruz County.

Heavy Rain, Sonoma

When: February 9, 4:02 AM PST
Where: Sonoma County, 6.24 mi S of Skaggs Spgs
Reported by: River/Stream Gage
Coordinates: 38.610, -123.020

A guage near Venado measured 13.68 inches of rain for a 72 hour total. This was the highest storm total reported for Sonoma County and for the entire forecast area.

Heavy Rain, Contra Costa

When: February 9, 4:11 AM PST
Where: Contra Costa County, 1.29 mi ESE of Diablo
Reported by: Mesonet
Coordinates: 37.760, -121.950

A 72 Hour Rainfall total of 3.93 inches from San Ramon at elevation 426 feet was the peak total for Contra Costa County.

Heavy Rain, Alameda

When: February 9, 4:25 AM PST
Where: Alameda County, 1.38 mi N of Hayward Highlands
Reported by: Mesonet
Coordinates: 37.650, -122.030

A 72 Hour Rainfall total of 3.08 inches was the peak for Alameda County.

What these are

Strong Wind: Non-thunderstorm winds below high wind criteria that nonetheless caused damage or casualties.
High Wind: Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.
Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
Heavy Rain: Rainfall totals unusual for the place and season that did not produce a flood.
Debris Flow: A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in California in 2015 Every state in 2015 This day in weather history Warnings in California, February 2015

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 554915, 554919, 554920, 555111, 554921, 554923, 554925, 554926, 554927, 554929, 554932, 554933, 555114, 555103, 554934, 554904, 554935, 554936, 555056, 555057, 555058, 555059, 555060, 555061, 554905, 555062, 555064, 555110, 555104, 555068, 555070, 554906, 555112, 555072, 555073, 555077, 554907, 554908, 554909, 554910, and more.