A series of significant winter storms impacted the district during late November and early December 2012. The first storm arrived November 28 and then was followed by three more winter storms.
Every event with a place to put it; 16 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
The episode as NWS MTR wrote it up.
A series of significant winter storms impacted the district during late November and early December 2012. The first storm arrived November 28 and then was followed by three more winter storms. Each brought strong and gusty winds, heavy rainfall, high surf, and flooding to the region. During the second storm on November 30, at noon time there were reported 13,800 power outages in the Bay Area.
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 Nov 28, 6:50 AM PST, 1 hour 59 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
650 AM PST WED NOV 28 2012
...WET AND WINDY THROUGH MIDDAY TODAY...
...SIGNIFICANT RAINFALL FROM THURSDAY NIGHT THROUGH SUNDAY...
.UPDATE...AS OF 6:50 AM PAST...JUST A QUICK UPDATE BEFORE THE MAIN
BAND OF RAIN STARTS TO MOVE ACROSS THE METRO AREA. KMUX SHOWS
MODERATE TO HEAVY RAINFALL STILL OFF THE COAST. THE RAIN IS QUICKLY
MOVING TO OUR AREA AND SHOULD IMPACT ALL AREAS THIS MORNING. SEVERAL
COASTAL SENSORS NOW GUSTING CLOSE TO 40 MPH. NEXT FEW HOURS EXPECT
LOCALLY STRONG WINDS, VERY HEAVY RAIN AT TIMES, AND POSSIBLY LIGHTNING AND
THUNDER. WOULD EXPECT A FAIR NUMBER OF REPORTS OF PONDING WATER ON
ROADWAYS ALONG WITH SOME MINOR URBAN FLOODING FOR LOW-LYING AREAS. DEFINITELY
ALLOW FOR MUCH LONGER THAN NORMAL COMMUTE TIMES THIS MORNING. MUCH
IMPROVED WEATHER BY AFTERNOON STILL EXPECTED.
.DISCUSSION...AS OF 3:55 AM PST WEDNESDAY...EARLY MORNING
SATELLITE SHOWS THAT THE TWO FRONTAL BOUNDARIES OFFSHORE ARE
BEGINNING TO MERGE. SIGNIFICANT CLOUD TOP COOLING AND EXPANSION
HAS BEEN OCCURRING ALONG THE LEADING FRONTAL BOUNDARY OVER THE
LAST SEVERAL HOURS...INDICATING STRENGTHENING OF THE FRONT IN AN
AREA OF STRONG DIFLUENT FLOW AHEAD OF THE APPROACHING SHORTWAVE
TROUGH. IN ADDITION TO STRONG DYNAMICS...THIS INCOMING SYSTEM HAS
TAPPED INTO A PLUME OF HIGH PRECIPITABLE WATER (PW). THIS PLUME
CONTAINS PW'S UP TO 1.25 INCHES. AND...AS THE SYSTEM TILTS MORE
TOWARD VERTICAL...PW VALUES AS HIGH AS 1.6 INCHES ARE BEING DRAWN
NORTHWARD FROM NEAR 25N/130W. WHAT THIS ALL MEANS IS THAT OUR
FORECAST AREA CAN EXPECT A PERIOD OF HEAVY RAIN AS THE FRONT
PUSHES ONSHORE LATER THIS MORNING.
RADAR CURRENTLY SHOWS WEAK RETURNS MOVING ONSHORE ACROSS THE
NORTH BAY...BUT NO MEASURABLE RAIN HAS YET BEEN DETECTED. EXPECT
THAT TO CHANGE RELATIVELY SOON GIVEN THE MORE WIDESPREAD AND
STRONGER RADAR RETURNS JUST OFFSHORE. RAIN SHOULD OVERSPREAD MUCH
OF THE NORTH BAY BY SUNRISE...AS WELL AS MOST COASTAL AREAS NORTH
OF MONTEREY BAY. THE BULK OF THE PRECIPITATION IS EXPECTED TO
OCCUR BETWEEN SUNRISE AND LATE MORNING. RAIN RATES WILL LIKELY BE
HEAVY FOR A TIME PRIOR TO FRONTAL PASSAGE...WITH HEAVIEST RAIN
RATES EXPECTED TO OCCUR BETWEEN 8 AM AND 11 AM. ALTHOUGH THIS
SYSTEM HAS TAKEN ON AN INCREASINGLY NEGATIVE TILT AND MAY HAVE
SLOWED SLIGHTLY...THE MODELS AGREE THAT IT WILL CONTINUE A
RELATIVELY BRISK EASTWARD MOVEMENT THROUGH THE MORNING HOURS.
THEREFORE...EVEN WITH THE EXPECTED HEAVY RAIN RATES...OVERALL
ACCUMULATION IS NOT EXPECTED TO BE EXCESSIVE. RAINFALL TOTALS WITH
THIS FIRST SYSTEM ARE EXPECTED TO RANGE FROM ONE TO TWO INCHES IN
THE COASTAL MOUNTAINS - HEAVIEST IN THE NORTH BAY...AND FROM 0.5
TO 1.0 INCH FOR MOST LOWER ELEVATION LOCATIONS. RAIN WILL TAPER
OFF BY EARLY AFTERNOON WITH JUST A FEW POST-FRONTAL SHOWERS
POSSIBLE THEREAFTER.
THERE HAD BEEN SEVERAL HOURS OVERNIGHT WHEN THERE WERE NO
LIGHTNING STRIKES DETECTED WITH THIS INCOMING SYSTEM. BUT A COUPLE
OF STRIKES HAVE RECENTLY BEEN DETECTED ALONG THE FRONTAL BOUNDARY OFF
THE CENTRAL CALIFORNIA COAST...NOT SURPRISING GIVEN THE RECENT
ENHANCEMENT THAT HAS TAKEN PLACE. ALTHOUGH THE NAM SHOWS
INSTABILITY DECREASING SOMEWHAT AS THE SYSTEM MAKES LANDFALL...FEEL
THAT THERE WILL STILL BE AT LEAST A SLIGHT CHANCE OF THUNDERSTORMS
OVER MUCH OF OUR AREA AS THE FRONT PUSHES INLAND LATER THIS
MORNING.
WINDS ARE CURRENTLY QUITE LIGHT OVER LAND BUT SOUTHEAST WINDS HAVE
BEGUN TO PICK UP OVER THE COASTAL WATERS WHERE THEY ARE GUSTING AS
HIGH AS 35 MPH. SOUTHERLY WINDS WILL INCREASE SIGNIFICANTLY BY
SUNRISE...ESPECIALLY NEAR THE COAST AND IN THE HILLS. WINDS WILL
THEN PEAK MID-TO-LATE MORNING AHEAD OF THE FRONT. A HIGH WIND
WARNING AND WIND ADVISORY IS IN EFFECT FROM 4 AM UNTIL 11 AM.
STRONG AND GUSTY WINDS MAY LINGER A BIT PAST 11 AM ACROSS THE
SOUTHERN PART OF THE FORECAST AREA...BUT WINDS IN MOST AREAS
SHOULD PEAK SOMEWHERE BETWEEN 9 AM AND 11 AM.
AFTER THIS FIRST IMPULSE MOVES INLAND THIS AFTERNOON...WE WILL SEE
A BREAK IN THE RAIN AND WIND FOR ABOUT 24 HOURS...ALTHOUGH SOME
INTERMITTENT LIGHT RAIN WILL LIKELY CONTINUE IN THE MOIST ONSHORE
FLOW FROM LATE THIS AFTERNOON INTO THURSDAY. ON THURSDAY THE NEXT
FRONTAL BOUNDARY WILL BEGIN TO SAG SOUTH INTO NORTHERN
CA...SPREADING MODERATE TO HEAVY RAIN INTO THE NORTH BAY BY LATE
THURSDAY AFTERNOON AND THEN GRADUALLY SOUTH THROUGH THE REST OF
THE FORECAST AREA THURSDAY NIGHT AND FRIDAY. THIS SECOND SYSTEM
WILL BE TAPPED INTO AN EVEN RICHER MOISTURE SUPPLY AND WILL MOVE
THROUGH MUCH MORE SLOWLY. THUS...RAINFALL TOTALS FROM LATE
THURSDAY THROUGH FRIDAY WILL LIKELY BE MUCH HIGHER THAN WITH
TODAY'S SYSTEM. THEN...ONE MORE IMPULSE WITH SIGNIFICANT RAINFALL
WILL MOVE THROUGH LATE SATURDAY THROUGH MIDDAY SUNDAY. BECAUSE
THESE WEATHER SYSTEMS FROM LATE THURSDAY THROUGH SUNDAY WILL CONTAIN
LARGE AMOUNTS OF MOISTURE AND WILL BE MOVING SLOWLY THROUGH THE
AREA...EXCESSIVE RAINFALL AMOUNTS ARE POSSIBLE. IN FACT...RAIN
TOTALS THROUGH SUNDAY COULD BE ON THE ORDER OF A FOOT OR MORE IN
THE COASTAL MOUNTAIN RANGES FROM SANTA CRUZ COUNTY NORTHWARD.
ALTHOUGH FLOODING ON THE MAIN STEM RIVERS IS NOT CURRENTLY
ANTICIPATED GIVEN THEIR ABILITY TO ACCOMMODATE LARGE AMOUNTS OF
WATER THIS EARLY IN THE SEASON...FLOODING OF SMALL RIVERS AND
STREAMS IS A POSSIBILITY BY FRIDAY AND CONTINUING INTO THE
WEEKEND. ALSO...LOCAL URBAN FLOODING IS LIKELY AT TIMES. IN
ADDITION...PERIODS OF STRONG WINDS WILL CONTINUE AND WILL LIKELY
PRODUCE POWER OUTAGES.
DRY WEATHER IS FORECAST TO RETURN EARLY NEXT WEEK AS A SHORTWAVE
RIDGE DEVELOPS ALONG THE WEST COAST.
&&
.AVIATION...AS OF 4:30 AM PST WEDNESDAY...RAIN AND SOUTHEAST
WINDS INCREASING DURING THE MORNING WITH THE HEAVIEST RAIN AND
STRONGEST RAIN BETWEEN A 15Z-19Z PERIOD ASSOCIATED WITH THE FRONT.
CIGS WILL LOWER INTO THE MVFR CATEGORY THIS MORNING THEN LIFT
ABOVE 3000 FEET IN THE AFTERNOON.
VICINITY OF KSFO...RAIN WITH MVFR CIGS SPREADING OVER THE AREA
AFTER 13Z. SOUTHEAST WINDS INCREASING TO 25-35 KT AFTER 14Z
THROUGH 19Z. WINDS WILL SWITCH TO MORE SOUTHERLY AND SLOWLY
DECREASE AFTER 19-20Z. CIGS WILL LIFT INTO VFR RANGE BUT PERIODS
OF RAIN WILL CONTINUE THROUGH THE AFTERNOON. RAIN ENDING FOR THE
MOST PART THIS EVENING WITH SOUTH TO SOUTHEAST WINDS 10 KT.
KSFO BRIDGE APPROACH...SIMILAR TO KSFO.
MONTEREY BAY AREA TERMINALS...STRONG SOUTHEAST WIND WILL BRING
DRIER AIR INTO THE LOW LEVELS KEEPING CIGS IN THE VFR RANGE.
RAIN EXPECTED AFTER 15Z WILL BE MOSTLY LIGHT. FRONTAL PASSAGE
EXPECTED AROUND 20Z WITH DECREASING RAIN AND WIND.
&&
.MARINE...AS OF 4:30 AM PST WEDNESDAY...SOUTHERLY WINDS 30 TO 40
KT CAN BE EXPECTED THIS MORNING AS THE FRONTAL SYSTEM MOVES
THROUGH. WINDS WILL DECREASE IN THE AFTERNOON AND EVENING BUT
SMALL CRAFT ADVISORIES ARE EXPECTED TO BE IN EFFECT.
A DEEP SURFACE LOW PRESSURE SYSTEM IN THE EASTERN PACIFIC WILL
GENERATE LARGE SWELLS THAT WILL ARRIVE AT THE COAST THURSDAY
NIGHT AND FRIDAY. SWELLS MAY INCREASE AS HIGH AS 14 TO 18 FEET.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
.TDAY...HIGH WIND WARNING...COASTAL AREAS FROM SONOMA COUNTY
SOUTH TO SAN MATEO COUNTY
WIND ADVISORY...INLAND SECTIONS OF THE SAN FRANCISCO
BAY AREA EXCEPT THE SANTA CLARA VALLEY.
ALSO COASTAL PORTIONS OF THE MONTEREY
BAY AREA AND SANTA LUCIA MOUNTAINS.
GLW...SF BAY UNTIL 2 PM GLW...MRY BAY UNTIL 2 PM
GLW...PT ARENA TO PT REYES 0-10 NM UNTIL 2 PM
GLW...PT REYES TO PIGEON PT 0-10 NM UNTIL 2 PM
GLW...PIGEON PT TO PT PINOS 0-10 NM UNTIL 2 PM
GLW...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM UNTIL 2 PM
GLW...PT ARENA TO PIGEON PT 10-60 NM UNTIL 2 PM
GLW...PIGEON PT TO PT PIEDRAS BLANCAS 10-60 NM UNTIL 2 PM
SCA...ROUGH BAR ADVISORY FOR SF BAR
&&
PUBLIC FORECAST: BELL/DYKEMA
AVIATION/MARINE: W PI
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WWW.YOUTUBE.COM/NWSBAYAREAHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 534 AM PST WED NOV 28 2012 CAZ506>508-510>512-517-528>530-291400- NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS- SAN FRANCISCO BAY SHORELINE-EAST BAY INTERIOR VALLEYS- EAST BAY HILLS AND DIABLO RANGE-SANTA CRUZ MOUNTAINS- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY- NORTHERN MONTEREY BAY-SOUTHERN MONTEREY BAY AND BIG SUR COAST- 534 AM PST WED NOV 28 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOST INLAND AREAS OF THE SAN FRANCISCO BAY AREA...EXCLUDING THE SANTA CLARA VALLEY. THIS HAZARDOUS WEATHER OUTLOOK IS ALSO FOR THE MONTEREY BAY AREA INCLUDING THE SANTA LUCIA MOUNTAINS. .DAY ONE...WEDNESDAY AND WEDNESDAY NIGHT A POWERFUL PACIFIC STORM WILL BRING A PERIOD OF STRONG WIND AND HEAVY RAIN TO THE REGION ON WEDNESDAY MORNING. SOUTHERLY WINDS WILL GUST AS HIGH AS 50 MPH THROUGH LATE MORNING. STRONGEST WINDS WILL BE NEAR THE OCEAN AND IN THE HILLS. A WIND ADVISORY IS IN EFFECT UNTIL 11 AM PST. * WIND ADVISORY.....SEE SFONPWMTR WWUS76 KMTR FOR DETAILS * WINDS WILL TURN TO THE SOUTHWEST AND DECREASE WEDNESDAY AFTERNOON. RAIN WILL ALSO TAPER OFF ON WEDNESDAY AFTERNOON. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A PERIOD OF VERY ACTIVE WEATHER IS FORECAST TO CONTINUE THROUGH THE WEEKEND. TWO MORE STORM SYSTEMS WILL MOVE THROUGH THE AREA...PRODUCING PERIODS OF HEAVY RAIN AND STRONG WINDS FROM LATE THURSDAY THROUGH SUNDAY. STRONG WINDS MAY RESULT IN POWER OUTAGES. RAINFALL ACCUMULATIONS THROUGH SUNDAY ARE EXPECTED TO RANGE FROM 3 TO 6 INCHES AT LOWER ELEVATIONS AND FROM 6 TO 12 INCHES IN THE COASTAL MOUNTAINS. THIS MAY RESULT IN SMALL STREAM OR CREEK FLOODING...AS WELL AS LOCALIZED URBAN FLOODING...BEGINNING LATE THURSDAY NIGHT AND CONTINUING THROUGH SUNDAY. CONTINUE TO MONITOR THE NATIONAL WEATHER SERVICE AND LOCAL MEDIA OUTLETS FOR FURTHER UPDATES ON THIS DEVELOPING STORM CYCLE. DRIER WEATHER IS FORECAST TO DEVELOP ON MONDAY OF NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES. CAZ513-516-518-291400- SANTA CLARA VALLEY...INCLUDING SAN JOSE- SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO- MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 534 AM PST WED NOV 28 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SANTA CLARA VALLEY AS WELL AS MOST INLAND AREAS OF MONTEREY AND SAN BENITO COUNTIES. .DAY ONE...WEDNESDAY AND WEDNESDAY NIGHT A POWERFUL PACIFIC STORM WILL BRING A PERIOD OF STRONG WIND AND HEAVY RAIN TO THE REGION ON WEDNESDAY MORNING. SOUTHERLY WINDS WILL GUST AS HIGH AS 40 MPH THROUGH LATE MORNING. STRONGEST WINDS WILL BE NEAR THE OCEAN AND IN THE HILLS. WINDS WILL TURN TO THE SOUTHWEST AND DECREASE WEDNESDAY AFTERNOON. RAIN WILL ALSO TAPER OFF ON WEDNESDAY AFTERNOON. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A PERIOD OF VERY ACTIVE WEATHER IS FORECAST TO CONTINUE THROUGH THE WEEKEND. TWO MORE STORM SYSTEMS WILL MOVE THROUGH THE AREA...PRODUCING PERIODS OF HEAVY RAIN AND STRONG WINDS FROM LATE THURSDAY THROUGH SUNDAY. STRONG WINDS MAY RESULT IN POWER OUTAGES. RAINFALL ACCUMULATIONS THROUGH SUNDAY ARE EXPECTED TO RANGE FROM 2 TO 4 INCHES AT LOWER ELEVATIONS AND FROM 4 TO 8 INCHES IN THE COASTAL MOUNTAINS. THIS MAY RESULT IN SMALL STREAM OR CREEK FLOODING...AS WELL AS LOCALIZED URBAN FLOODING...FROM FRIDAY THROUGH SUNDAY. CONTINUE TO MONITOR THE NATIONAL WEATHER SERVICE AND LOCAL MEDIA OUTLETS FOR FURTHER UPDATES ON THIS DEVELOPING STORM CYCLE. DRIER WEATHER IS FORECAST TO DEVELOP ON MONDAY OF NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES. CAZ006-505-509-291400- SAN FRANCISCO- COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST- 534 AM PST WED NOV 28 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR COASTAL AREAS FROM SONOMA COUNTY SOUTH THROUGH SAN MATEO COUNTY. .DAY ONE...WEDNESDAY AND WEDNESDAY NIGHT A POWERFUL PACIFIC STORM WILL BRING A PERIOD OF STRONG WIND AND HEAVY RAIN TO THE REGION ON WEDNESDAY MORNING. SOUTHERLY WINDS WILL GUST AS HIGH AS 60 MPH THROUGH LATE MORNING. STRONGEST WINDS WILL BE NEAR THE OCEAN AND IN THE HILLS. A HIGH WIND WARNING IS IN EFFECT UNTIL 11 AM PST. * HIGH WIND WARNING.....SEE SFONPWMTR WWUS76 KMTR FOR DETAILS * WINDS WILL TURN TO THE SOUTHWEST AND DECREASE WEDNESDAY AFTERNOON. RAIN WILL ALSO TAPER OFF ON WEDNESDAY AFTERNOON. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A PERIOD OF VERY ACTIVE WEATHER IS FORECAST TO CONTINUE THROUGH THE WEEKEND. TWO MORE STORM SYSTEMS WILL MOVE THROUGH THE AREA...PRODUCING PERIODS OF HEAVY RAIN AND STRONG WINDS FROM LATE THURSDAY THROUGH SUNDAY. STRONG WINDS MAY RESULT IN POWER OUTAGES. RAINFALL ACCUMULATIONS THROUGH SUNDAY ARE EXPECTED TO RANGE FROM 3 TO 6 INCHES AT LOWER ELEVATIONS AND FROM 6 TO 12 INCHES IN THE COASTAL MOUNTAINS. THIS MAY RESULT IN SMALL STREAM OR CREEK FLOODING...AS WELL AS LOCALIZED URBAN FLOODING...BEGINNING LATE THURSDAY NIGHT AND CONTINUING THROUGH SUNDAY. CONTINUE TO MONITOR THE NATIONAL WEATHER SERVICE AND LOCAL MEDIA OUTLETS FOR FURTHER UPDATES ON THIS DEVELOPING STORM CYCLE. DRIER WEATHER IS FORECAST TO DEVELOP ON MONDAY OF NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES.
The San Francisco radar (KMUX), 115 km away, was scanning. The volume nearest the first event began at 12:59 UTC.
12 heavy rain, 10 strong wind, 7 high wind, 4 flood, 4 flash flood, 1 debris flow. Local standard time, as filed.
A wind gust of 62 MPH was measured at the coast. Numerous trees down and some power outages occurred due to the wind gusts.
A wind gust of 56 MPH was measured at Pt. Reyes on the coast. Numerous trees down and some power outages occurred due to the wind gusts.
A wind gust of 56 MPH was measured at Highland Peak RAWS at elevation 2490 feet. Numerous trees down and some power outages occurred due to the wind gusts.
A wind gust of 61 MPH was measured at Spring Valley RAWS at elevation 1075 feet. Numerous trees down and some power outages occurred due to the wind gusts.
A wind gust of 60 MPH was measured at Rose Peak at elevation 3030 feet. Numerous trees down and some power outages occurred due to the wind gusts.
High winds brought down a tree on Old La Honda Road in Woodside that closed both lanes of traffic for several hours.
A wind gust of 75 MPH was measured at Los Gatos RAWS at elevation 1842 feet. Numerous trees down and some power outages occurred due to the wind gusts.
High winds knocked trees down onto power lines which sparked a fire that burned down a small cabin near Fairfax, killing a person inside.
A wind gust of 84 MPH was measured at Los Gatos RAWS at 1842 feet elevation. Numerous trees down and some power outages occurred due to the wind gusts.
Caltrans reported southbound highway 29 was closed north of Peterson Drive near Bothe-Napa Valley State Park because of downed trees between 3 A.M. and 9:40 A.M. Friday.
A wind gust of 63 MPH was measured at Mill Valley at elevation 316 feet. Numerous trees down and some power outages occurred due to the wind gusts.
A wind gust of 63 MPH was measured at Spring Valley RAWS at elevation 1075 feet. Numerous trees down and some power outages occurred due to the wind gusts.
Hopper Creek flooded residential streets beginning around 5 AM with the water subsiding after the rains ended later Friday morning.
Observations at Conn Dam measured heavy rainfall. Minor urban and small stream flooding was observed across Napa County due to the heavy rainfall.
Observations measured heavy rainfall. Minor urban and small stream flooding was observed across Sonoma County due to the heavy rainfall.
Observations at 2020 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Santa Clara County due to the heavy rainfall.
Observations at 479 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Santa Cruz County due to the heavy rainfall.
Observations at 3288 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Monterey County due to the heavy rainfall.
A large tree was blown down by strong wind gusts in the Pacific Heights neighborhood. Traffic was blocked for hours as a busy intersection was blocked and a car was smashed.
Following heavy rain on November 30, a mudslide shut down portions of Highway 84, Niles Canyon Road, to the east of Fremont. The California Highway Patrol closed the road due to the mudslide.
Observations at 1715 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Napa County due to the heavy rainfall.
A pair of acacia trees was toppled by wind gusts estimated at 55 MPH. The trees blocked Carbonera drive in the Pasatiempo area. The trees also buried an SUV parked at the curb on the street.
Observations at 3288 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Monterey County due to the heavy rainfall.
Observations at 3368 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Monterey County due to the heavy rainfall.
Observations at 3400 feet elevation measured heavy rainfall. Minor urban and small stream flooding was observed across Santa Clara County due to the heavy rainfall.
Heavy rainfall measured at Conn Dam. Minor flooding of urban areas and small streams was observed across Napa County during this event.
Pacific Gas and Electric had 1300 customers reported without power in Santa Cruz County due to outages caused by wind gusts and fallen trees.
Alpine Road in San Mateo County was closed until noon due to downed trees and power lines.
A CoCoRaHS spotter reports 3.50 inches of rain since 700 AM PST with a storm total of 4.88 inches. The spotter observed overwhelmed drainage culverts along the road that were backing up with significant erosion being reported.
A man drowned in the waters of Soquel Creek in Capitola during a heavy rainstorm that produced minor flooding of the creek. He drowned in a section of the creek in Perry Park at the rear of a grocery store on 809 Bay Avenue in Capitola.
CoCoRaHS spotter reports that rain intensity has increased and the flash flooding is beginning again with overwhelmed drainage culverts and flooding on the roadways with erosion of the banks around culverts observed.
The general manager of pajaro dunes south said that 6 inches of water was covering beach road near shell drive due to heavy rainfall.
Downed power lines closed Trout Gulch Road and highland Way, and Highway 9 between Felton and Ben Lomond. Highway 9 was closed all day for Electric Company power line repairs.
Highway 84 was flooded between Decoto Road and Newark Boulevard and between Mission Boulevard and Main Street.
Storm total rainfall of 8.03 inches measured at Mining Ridge RAWS site at 3288 feet elevation. 3.42 inches of this rain fell in the past 3 hours prior to the report. Minor flooding of urban areas and small streams was observed across Monterey County during this event.
Heavy rainfall measured at 479 feet elevation. Minor flooding of urban areas and small streams was observed across Santa Cruz County during this event.
City of Petaluma flood monitoring gauges on Willow Brook at Penngrove Park measured at 62.0 feet. At 60.7 feet, water goes out of the banks. Minor flooding in Petaluma in park lands along the brook and the Petaluma River.
City of Petaluma flood monitoring gauges on Willow Brook at Penngrove Park measured stage of 62.4 feet. At 60.7 feet water comes out of the banks. Minor flooding in Petaluma is observed in park land on Willow Brook and Petaluma River.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Strong Wind, North Bay Interior Valleys | 2012-11-30 | Female | Permanent Structure | Indirect | |
| Flood, Santa Cruz | 2012-11-30 | 47 | Male | In Water | Direct |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2012Every state in 2012This day in weather historyWarnings in California, November 2012
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: 420053, 420048, 420052, 420049, 420050, 420057, 420051, 420067, 420056, 420119, 420054, 420055, 420114, 419930, 419931, 419932, 419933, 419934, 420014, 420041, 419935, 420008, 419936, 419937, 419938, 419939, 420009, 420060, 419928, 419271, 419929, 420010, 420058, 420059, 419940, 419941, 419924, 419927.