Another round of gusty north to northeast winds buffeted sections of Southern California. The strongest winds occurred across the mountains of Ventura and Los Angeles counties.
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 LOX wrote it up.
Another round of gusty north to northeast winds buffeted sections of Southern California. The strongest winds occurred across the mountains of Ventura and Los Angeles counties.
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 Los Angeles, CA wrote its last area forecast discussion before the first event at Dec 20, 8:16 PM PST, 5 hours 37 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 816 PM PST THU DEC 20 2007 .UPDATE...MAJORITY OF STORM SYSTEM APPEARS TO HAVE PUSHED OVER THE AREA. MAIN FRONTAL BAND HAS PUSHED SOUTH OF THE AREA...BUT UPPER- LEVEL COLD FRONT IS NOW PUSHING OVER THE AREA THIS EVENING. A BAND OF SHOWERS WAS SEEN DEVELOPING ON RADAR AND SATELLITE IMAGERY FROM THE VENTURA COUNTY VALLEYS THROUGH THE LOS ANGELES COUNTY VALLEYS AND INTO THE LOS ANGELES COUNTY MOUNTAINS. THIS APPEARS TO BE THE LAST HURRAH WITH THIS SYSTEM. GRADIENTS ARE NOW STARTING TO TREND OFFSHORE NOW WITH KSBA-KBFL AND KSBA-KSMX TRENDING OFFSHORE CURRENTLY. THE START OF OFFSHORE FLOW IS COINCIDING FINE WITH THE UPPER-LEVEL COLD AIR INTRUSION...SWITCHING THE PRESSURE AND THERMAL GRADIENTS. SUBSIDENCE SHOULD BUILD IN ALOFT AND WITH NAM-WRF AND GFS THERMAL AND PRESSURE GRADIENTS EXPECTED TO STRENGTHEN THROUGH TONIGHT. PRODUCTS SEEMS LOGICAL AT THE CURRENT TIME. NAM-WRF SOLUTIONS...ALTHOUGH A TENDENCY TO BE STRONG WITH THE WINDS INDICATE 50 KNOTS OF NORTHERLY WINDS IN THE BOUNDARY LAYER AND AT 850 MB IN THE LOS ANGELES COUNTY MOUNTAINS TONIGHT. WITH THERMAL AND PRESSURE GRADIENTS NOT OVERLY STRONG...WIND PRODUCTS WILL LIKELY BE CONTINUED EXCEPT FOR THE ANTELOPE VALLEY. FLOW TURNS MORE NORTHEASTERLY ON FRIDAY NIGHT...KEEPING THE POSSIBILITY OF NEEDING TO EXTEND THE WIND HEADLINES FOR THE MOUNTAINS. HOWEVER AT THE CURRENT TIME...THE 850 MB WINDS SEEM ON THE LIGHT SIDE IN BOTH MODELS WHICH COULD PRODUCE A MARGINAL EVENT ON FRIDAY NIGHT. ANOTHER WEAK BOUNDARY PUSHES SOUTH OVER THE STATE ON SATURDAY NIGHT AND SUNDAY. WITH A MORE NORTHERLY TRAJECTORY OF THE COLD FRONT AND THE INTERIOR TRACK OF THE UPPER-LEVEL TROUGH CENTER...IT IS HARD TO GET EXCITED ABOUT ANY PRECIPITATION AT THIS TIME. BEST CHANCE OF PRECIPITATION WILL BE ALONG THE CENTRAL COAST AND POSSIBLY THE NORTHERN SLOPES OF THE MOUNTAINS. FOR THIS STORM SYSTEM...IT APPEARS THAT A BETTER CHANCE EXISTS FOR OFFSHORE WINDS DEVELOPING BEHIND THE FRONT. ANOTHER INSIDE-SLIDER SYSTEM IS EXPECTED FOR MIDWEEK NEXT WEEK AS A STRONGER SYSTEM DROPS SOUTH THROUGH CENTRAL CALIFORNIA. BOTH GFS AND ECMWF AGREE REASONABLY WELL WITH THE SYSTEM TRACK AND INTENSITY...BUT TIMING APPEARS TO BE A MAJOR DISAGREEMENT IN THE CURRENT MODEL SOLUTIONS. && .PREV DISCUSSION... /ISSUED 308 PM PST THU DEC 20 2007/ SHORT TERM...(TONIGHT-SUNDAY) FORECAST ON TRACK AS SHOWERS HAVE REACHED VENTURA COUNTY AND SHOULD AFFECT LA COUNTY LATER THIS AFTERNOON INTO THE EVENING HOURS. MOST AREAS TO THE NORTH RECEIVED FROM BETWEEN A TENTH OF AN INCH TO A QUARTER OF AN INCH OF RAINFALL. THE ANTELOPE VALLEY CONTINUES TO SEE SOUTHWEST TO WEST WINDS GUSTING TO NEAR 50 MPH IN SOME LOCATIONS THIS AFTERNOON. WINDS SHOULD BEGIN TO DIMINISH BELOW WIND ADVISORY THRESHOLDS LATER THIS EVENING ACROSS THE HIGH DESERT. AS THIS RELATIVELY WEAK FRONTAL BAND CONTINUES TO MOVE THROUGH THE AREA...STRONG NORTHWEST TO NORTH WINDS WILL DEVELOP BEHIND THE FRONT. AT FIRST...THE CENTRAL COAST WILL EXPERIENCE GUSTY NW WINDS THIS AFTERNOON AND EVENING...THEN THE SANTA BARBARA COUNTY MOUNTAINS AND SBA SOUTH COAST WILL SEE INCREASING NW TO N WINDS BETWEEN 25 TO 40 MPH WITH LOCAL GUSTS TO 50 MPH THIS AFTERNOON THROUGH THE OVERNIGHT HOURS. AS THE WINDS BECOME MORE NORTH ORIENTED TONIGHT...THE FOCUS WILL BE ACROSS THE INTERSTATE 5 CORRIDOR TONIGHT WITH DANGEROUS GUSTY WINDS BETWEEN 35 TO 50 MPH WITH GUSTS TO 60 MPH LIKELY. ON TOP OF THAT...MODELS KEEP CLOUDS PILED UP ACROSS THE NORTHERN SLOPES OF SBA...VENTURA AND WESTERN LOS ANGELES COUNTY MOUNTAINS OVERNIGHT. SNOW LEVELS WILL DROP LIKE A ROCK FROM 5500 FT TO 3500 FT AFTER MIDNIGHT. ALTHOUGH MOISTURE WILL BE LIMITED...A COUPLE INCHES OF SNOW WILL BE LIKELY LOCALLY. WITH STRONG WINDS AND LOCAL BLOWING SNOW...DRIVING CONDITIONS WILL BE HAZARDOUS AT TIMES OVER PORTIONS OF THE GRAPEVINE. THEREFORE...A HIGH WIND WARNING IS IN EFFECT FROM THIS EVENING THROUGH FRIDAY MORNING FOR THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTY AS STRONG NORTH WINDS WILL DEVELOP RAPIDLY OVERNIGHT. THESE NORTHERLY WINDS WILL ALSO AFFECT SANTA CLARITA...WESTERN PORTIONS OF THE SAN FERNANDO VALLEY INCLUDING VAN NUYS AND CHATSWORTH. THE HOLLYWOOD HILLS AND MALIBU ARE ALSO SUSCEPTIBLE TO NORTHERLY WINDS. SO WIND ADVISORIES HAVE BEEN ISSUED FOR THESE LOCATIONS AS WELL BEGINNING FROM THIS EVENING THROUGH FRIDAY MORNING. DID WANT TO MENTION THAT A RATHER STRONG VORT ALONG THE WESTERN SIDE OF THE UPPER LOW WILL WILL APPROACH THE AREA LATER THIS EVENING. CONVECTIVE PARAMETERS ARE NOT FAVORABLE SUCH AS THE LIFTED INDEX AND K INDEX. HOWEVER...WITH 500 MB TEMPS AT -24 DEGREES CELSIUS...AND THIS STRONG VORT MOVING THROUGH SOUTHERN LA COUNTY...A VERY SLIGHT CHANCE FOR THUNDERSTORMS TO DEVELOP WILL HAVE TO BE MONITORED THIS EVENING. OVERNIGHT TEMPS WILL BE NEAR FREEZING ACROSS THE CENTRAL COAST WITH SUBFREEZING TEMPS ACROSS THE INTERIOR SLO COUNTY. SINCE FROST ADVISORIES HAVE BEEN ISSUED ALREADY TWICE FOR THE CENTRAL COAST THIS FALL...WILL NOT BE PUTTING OUT A FROST ADVISORY FOR THE CENTRAL COAST. TEMPS WILL REMAIN QUITE COOL ON FRIDAY ACROSS THE REGION. WINDS WILL BEGIN TO SHIFT FROM THE N TO NE FRIDAY AFTERNOON. THIS WILL TRANSLATE INTO WIND ADVISORIES LIKELY FOR THE MUCH OF THE LA/VTU COUNTIES FRIDAY EVENING THROUGH SAT AFTERNOON. SKIES WILL REMAIN CLEAR BOTH FRI AND SAT AS OFFSHORE WINDS WILL PREVAIL ACROSS THE FORECAST AREAS. ANOTHER STRONG NORTHERLY WIND GRADIENT DEVELOPS EARLY SUNDAY WHICH WILL CAUSE NORTHERLY WINDS TO DEVELOP ONCE AGAIN ACROSS THE LOCAL MOUNTAINS. TEMPS WILL REMAIN COOLER THAN NORMAL THROUGH THE PERIOD. LONG TERM...(MON-THU) BOTH THE GFS AND ECMWF ARE IN PRETTY GOOD AGREEMENT ON MONDAY AS WEAK UPPER LVL RIDGE WILL PERSIST OVER THE REGION WITH WEAK OFFSHORE FLOW. MODELS DIVERGE GREATLY ON TUESDAY THROUGH THU AS GFS CONTINUES WEAK RIDGE OVER THE FORECAST AREA...AND EURO DEVELOPS A CUTOFF LOW THAT DROPS OUT OF NEVADA INTO WESTERN AZ. THIS CUTOFF LOW IS FARTHER EAST THAN THE PREVIOUS RUNS...THEREFORE CHANCE OF RAIN TUE AND WED LOOKS HIGHLY UNLIKELY...BUT GUSTY WINDY CONDITIONS ARE POSSIBLE IF THE EURO SOLUTION IS CORRECT. TEMPS WILL REMAIN SLIGHTLY BELOW NORMAL THROUGH THE PERIOD. && .AVIATION...21/0415Z...MVFR CEILINGS AND VISIBILITIES OVER THE SOUTHERN PORTION OF THE AREA SHOULD CLEAR OUT WITHIN THE NEXT HOUR OR SO AS OFFSHORE FLOW ESTABLISHES. VFR CONDITIONS SHOULD DEVELOP OVER MOST OF THE AREA EXCEPT KPRB AFTER 09Z. WIND SHEAR ISSUES SHOULD DEVELOP OVER THE AREA TONIGHT...WITH THE MORE LIKELY CANDIDATES BEING KSBA...KVNY...AND KBUR. .KLAX...MVFR CONDITIONS SHOULD PERSIST ONLY FOR THE NEXT 30 TO 90 MINUTES...THEN VFR CONDITIONS SHOULD DEVELOP FOR THE REMAINDER OF THE PERIOD. .KBUR...VFR CONDITIONS SHOULD DEVELOP FOR THE REMAINDER OF THE PERIOD. WIND SHEAR ISSUES SHOULD START DEVELOPING SHORTLY...WITH WINDS THAT COULD APPROACH 40 KNOTS OUT OF THE NORTH JUST ABOUT 2000 FT OFF THE SURFACE. && .LOX WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY (SEE LAXNPWLOX). HIGH WIND WARNING (SEE LAXNPWLOX). SMALL CRAFT ADVISORY (SEE LAXCWFLOX). GALE WARNING (SEE LAXCWFLOX). && HALL/KAPLAN WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 1018 PM PST THU DEC 20 2007 CAZ034>041-044>047-051>054-059-087-088-211400- SAN LUIS OBISPO COUNTY CENTRAL COAST- SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY- SAN LUIS OBISPO COUNTY INTERIOR VALLEYS-CUYAMA VALLEY- SANTA BARBARA COUNTY SOUTH COAST-VENTURA COUNTY COAST- LOS ANGELES COUNTY COAST INCLUDING DOWNTOWN LOS ANGELES- VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS- SANTA MONICA MOUNTAINS RECREATIONAL AREA- LOS ANGELES COUNTY VALLEYS-SAN LUIS OBISPO COUNTY MOUNTAINS- SANTA BARBARA COUNTY MOUNTAINS-VENTURA COUNTY MOUNTAINS- LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE- ANTELOPE VALLEY-CATALINA ISLAND-SANTA CLARITA VALLEY- 1018 PM PST THU DEC 20 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... REST OF TONIGHT GUSTY NORTHERLY WINDS WILL DEVELOP IN THE MOUNTAINS AND BELOW PASSES AND CANYONS TONIGHT...CREATING HAZARDOUS DRIVING CONDITIONS AND FLYING DEBRIS. IN THE MOST WIND PRONE AREAS...WIND GUSTS OVER 50 MPH ARE POSSIBLE. ACROSS THE OUTER WATERS GALE FORCE WINDS WILL POSE HAZARDS TO MARINERS ESPECIALLY THOSE IN SMALL CRAFT. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY VERY WINDY CONDITIONS THROUGH AND BELOW PASSES AND CANYONS WILL CONTINUE TO AFFECT THE MOUNTAINS...COASTS...AND VALLEYS. DANGEROUS WIND GUSTS OF 65 MPH ARE POSSIBLE AND COULD CREATE HAZARDOUS FLYING DEBRIS AS WELL AS KNOCKING HIGHER PROFILE VEHICLES OVER. GALE FORCE WINDS WILL CONTINUE IN THE MORNING HOURS IN THE OUTER WATERS... CREATING HAZARDS TO MARINERS ESPECIALLY THOSE IN SMALL CRAFT. NO HAZARDOUS WEATHER IS FORECAST FROM SATURDAY THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MEIER/KAPLAN
5 high wind. Local standard time, as filed.
The Warm Springs RAWS sensor reported northerly wind gusts up to 58 mph.
North to northeast winds gusting to around 58 mph were reported across the mountains of Ventura county.
The Malibu Hills RAWS sensor reported northerly wind gusts up to 65 mph.
The Clear Creek RAWS sensor reported northerly wind gusts up to 58 mph.
The Chilao RAWS sensor reported northerly wind gusts up to 73 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2007Every state in 2007This day in weather historyWarnings in California, December 2007
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: 65817, 65820, 65816, 65819, 65818.