Frost Advisory 19, NWS Los Angeles, CA

146 
WWUS76 KLOX 210535
NPWLOX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
935 PM PST THU DEC 20 2012

...SUB-FREEZING TEMPERATURES AGAIN TONIGHT INTO FRIDAY MORNING...

.A COLD AND DRY AIR MASS WILL ONCE AGAIN BRING SUB-FREEZING
TEMPERATURES TO PORTIONS OF THE REGION TONIGHT INTO FRIDAY
MORNING...ESPECIALLY OVER THE CENTRAL COAST AND MOST COASTAL
VALLEY AREAS. THE COLDEST TEMPERATURES WILL ONCE AGAIN OCCUR OVER
THE INTERIOR VALLEYS...HOWEVER THOSE AREAS HAVE ALREADY RECEIVED
TWO OR MORE FREEZES THIS SEASON.

CAZ034>036-211400-
/O.CON.KLOX.FR.Y.0019.121221T1000Z-121221T1700Z/
SAN LUIS OBISPO COUNTY CENTRAL COAST-
SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY-
INCLUDING THE CITIES OF...SAN LUIS OBISPO...PISMO BEACH...
MORRO BAY...CAMBRIA...SAN SIMEON...SANTA MARIA...LOMPOC...
VANDENBERG...SANTA YNEZ...SOLVANG
935 PM PST THU DEC 20 2012

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PST
FRIDAY...

* TEMPERATURES...TEMPERATURES WILL FALL TO BETWEEN 28 AND 32 
  DEGREES ACROSS WIND SHELTERED LOCATIONS LATE TONIGHT INTO 
  EARLY FRIDAY MORNING.

* IMPACTS...FROST CAN CAUSE DAMAGE TO SENSITIVE PLANTS IF LEFT 
  UNCOVERED OUTDOORS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS IMMINENT. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

CAZ044>046-547-211400-
/O.CON.KLOX.FR.Y.0019.121221T1000Z-121221T1700Z/
VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS-
SANTA MONICA MOUNTAINS RECREATIONAL AREA-
LOS ANGELES COUNTY SAN FERNANDO VALLEY-
INCLUDING THE CITIES OF...SANTA PAULA...FILLMORE...OJAI...PIRU...
THOUSAND OAKS...NEWBURY PARK...MOORPARK...SIMI VALLEY...TOPANGA...
WOODLAND HILLS...NORTHRIDGE...BURBANK...UNIVERSAL CITY
935 PM PST THU DEC 20 2012

...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PST
FRIDAY...

* TEMPERATURES...TEMPERATURES WILL FALL TO BETWEEN 28 AND 32 
  DEGREES ACROSS WIND SHELTERED LOCATIONS LATE TONIGHT INTO 
  EARLY FRIDAY MORNING...ESPECIALLY OVER THE OJAI AND WESTERN 
  SAN FERNANDO VALLEYS.

* IMPACTS...FROST CAN CAUSE DAMAGE TO SENSITIVE PLANTS IF LEFT 
  UNCOVERED OUTDOORS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS IMMINENT. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

KITTELL/SIRARD

723 
WWUS76 KLOX 211332
NPWLOX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
532 AM PST FRI DEC 21 2012

...SUB-FREEZING TEMPERATURES EARLY THIS MORNING...

.A COLD AND DRY AIR MASS WILL ONCE AGAIN BRING SUB-FREEZING
TEMPERATURES TO PORTIONS OF THE REGION EARLY THIS MORNING
ESPECIALLY OVER THE CENTRAL COAST AND MOST COASTAL VALLEY AREAS.
THE COLDEST TEMPERATURES WILL ONCE AGAIN OCCUR OVER THE INTERIOR
VALLEYS...HOWEVER THOSE AREAS HAVE ALREADY RECEIVED TWO OR MORE
FREEZES THIS SEASON.

CAZ034>036-211700-
/O.CON.KLOX.FR.Y.0019.000000T0000Z-121221T1700Z/
SAN LUIS OBISPO COUNTY CENTRAL COAST-
SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY-
INCLUDING THE CITIES OF...SAN LUIS OBISPO...PISMO BEACH...
MORRO BAY...CAMBRIA...SAN SIMEON...SANTA MARIA...LOMPOC...
VANDENBERG...SANTA YNEZ...SOLVANG
532 AM PST FRI DEC 21 2012

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* TEMPERATURES...TEMPERATURES WILL FALL TO BETWEEN 28 AND 32
  DEGREES ACROSS WIND SHELTERED LOCATIONS EARLY THIS MORNING.

* IMPACTS...FROST CAN CAUSE DAMAGE TO SENSITIVE PLANTS IF LEFT 
  UNCOVERED OUTDOORS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS IMMINENT. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

CAZ044>046-547-211700-
/O.CON.KLOX.FR.Y.0019.000000T0000Z-121221T1700Z/
VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS-
SANTA MONICA MOUNTAINS RECREATIONAL AREA-
LOS ANGELES COUNTY SAN FERNANDO VALLEY-
INCLUDING THE CITIES OF...SANTA PAULA...FILLMORE...OJAI...PIRU...
THOUSAND OAKS...NEWBURY PARK...MOORPARK...SIMI VALLEY...TOPANGA...
WOODLAND HILLS...NORTHRIDGE...BURBANK...UNIVERSAL CITY
532 AM PST FRI DEC 21 2012

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* TEMPERATURES...TEMPERATURES WILL FALL TO BETWEEN 28 AND 32
  DEGREES ACROSS WIND SHELTERED LOCATIONS EARLY THIS MORNING
  ESPECIALLY OVER THE OJAI AND WESTERN SAN FERNANDO VALLEYS.

* IMPACTS...FROST CAN CAUSE DAMAGE TO SENSITIVE PLANTS IF LEFT 
  UNCOVERED OUTDOORS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS IMMINENT. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

RAT

127 
WWUS76 KLOX 211701
NPWLOX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
901 AM PST FRI DEC 21 2012



CAZ034>036-044>046-547-211815-
/O.EXP.KLOX.FR.Y.0019.000000T0000Z-121221T1700Z/
SAN LUIS OBISPO COUNTY CENTRAL COAST-
SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY-
VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS-
SANTA MONICA MOUNTAINS RECREATIONAL AREA-
LOS ANGELES COUNTY SAN FERNANDO VALLEY-
INCLUDING THE CITIES OF...SAN LUIS OBISPO...PISMO BEACH...
MORRO BAY...CAMBRIA...SAN SIMEON...SANTA MARIA...LOMPOC...
VANDENBERG...SANTA YNEZ...SOLVANG...SANTA PAULA...FILLMORE...
OJAI...PIRU...THOUSAND OAKS...NEWBURY PARK...MOORPARK...
SIMI VALLEY...TOPANGA...WOODLAND HILLS...NORTHRIDGE...BURBANK...
UNIVERSAL CITY
901 AM PST FRI DEC 21 2012

...FROST ADVISORY HAS EXPIRED...


$$

SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
200 PM PST THU DEC 20 2012

.SYNOPSIS...
AFTERNOON TEMPERATURES WILL WARM TO NEAR NORMAL BY FRIDAY. A SERIES
OF COLD FRONTS WILL BRING PERIODS OF PRECIPITATION...AND BREEZY
WINDS AT TIMES...AS THEY MOVE ACROSS THE REGION LATE FRIDAY NIGHT
THROUGH MONDAY. DRY WEATHER IS EXPECTED CHRISTMAS EVE NIGHT AND
CHRISTMAS DAY...FOLLOWED BY MORE UNSETTLED WEATHER.

&&

.SHORT TERM (TODAY-MONDAY)...
BREEZY OFFSHORE FLOW AND WEAK RIDGING ALOFT HAS BROUGHT SOME WARMING
TO THE AREA...MOSTLY FELT OVER THE MOUNTAINS AND INTERIOR
AREAS...THOUGH TEMPERATURES ARE STILL UNDER SEASONAL NORMALS.
DESPITE THE WARMING...THE VERY DRY AIR AND LACK OF A MARINE LAYER
WILL BRING ONE MORE ROUND OF VERY COLD TEMPERATURES TO MOST OF THE
AREA TONIGHT...THOUGH A COUPLE OF DEGREES WARMER THAN THIS MORNING.
A BORDERLINE FROST ADVISORY WILL BE ISSUED SHORTLY FOR THE COLDEST
VALLEYS AND THE CENTRAL COAST.

A LARGE 510DM LOW JUST OFF THE WESTERN CANADIAN COAST WILL MOVE
LITTLE THROUGH THE WEEKEND...THEN PUSH TO THE EAST SUNDAY NIGHT INTO
MONDAY. A LONG COLD FRONT CURRENTLY OVER NORTHERN CALIFORNIA WILL
SLOWLY MOVE DOWN THE COAST TOMORROW...THEN STALL FOR 12-18 HRS.
WHILE THE CORE OF THE WARM FRONTAL RAIN JUST AHEAD OF THE COLD FRONT
WILL BE OVER MONTERREY COUNTY...THE FRINGES MAY STRETCH INTO
NORTHERN SLO COUNTY...WHICH WOULD RESULT IN A LONG PERIOD OF LIGHT
TO MODERATE RAIN AND POSSIBLE ACCUMULATIONS OVER 1 INCH. ANOTHER
FRONT WILL PUSH DOWN THE COAST ON FRIDAY NIGHT...THEN MOVE THE
STALLED RAIN DOWN THROUGH OUR AREA SATURDAY AND SATURDAY
NIGHT...BRINGING MOSTLY LIGHT RAINFALL TO ALL AREAS. BUMPED THE POPS
UP FOR SATURDAY NIGHT EVERYWHERE WITH GROWING CONFIDENCE IN
ACCUMULATING RAINS...BUT AMOUNTS OUTSIDE OF THE CENTRAL COAST
(0.50-1.25 INCHES) SHOULD BE LIGHT (0.10-0.33 INCHES). EXPECT GUSTY
SOUTH WINDS ON SATURDAY ASSOCIATED WITH THE FRONTAL SYSTEM. DAYTIME
TEMPERATURES WILL REMAIN COOL...BUT NIGHT TIME TEMPERATURES WILL BE
MUCH WARMER THAN THE LAST FEW NIGHTS THANKS TO THE ADDED MOISTURE
AND CLOUD COVER.

A FEW SHOWERS MAY LINGER AROUND ON SUNDAY...BUT SOME SUN SHOULD POKE
THROUGH. A LOW PRESSURE SYSTEM CURRENTLY SOUTH OF THE ALEUTIAN
ISLANDS WILL QUICKLY PUSH INTO NORTHERN CALIFORNIA SUNDAY NIGHT INTO
MONDAY...AND BRING ANOTHER ROUND OF MODERATE RAIN...BUT THIS TIME TO
MOST OF THE REGION. AMOUNTS LOOK TO GENERALLY RANGE BETWEEN 0.50 AND
1.00 INCHES WITH LOCAL AMOUNTS UP TO 2.00 INCHES POSSIBLE.

SNOW LEVELS WITH BOTH OF THESE SYSTEMS ARE NOT VERY LOW...WITH ANY
SNOW ACCUMULATIONS LIKELY STAYING ABOVE 6000 FEET. GUSTY NORTHWEST
WINDS WILL LIKELY FOLLOW MONDAY NIGHT...WHICH WILL CLEAR THINGS OUT
AND KEEP ANY SHOWERS CONFINED TO THE MOUNTAINS...ALLOWING FOR GOOD
WEATHER FOR AIRBORNE SLEIGH RIDE DELIVERIES.

.LONG TERM (TUESDAY-THURSDAY)...
CHRISTMAS DAY IS STILL LOOKING DRY WITH A LITTLE OFFSHORE FLOW AND
MODEST RIDGING ALOFT...WHICH WILL HELP TEMPERATURES TO WARM CLOSE TO
NORMAL FOR AT LEAST COASTAL AND VALLEY AREAS. THE CLEARING LOOKS
BRIEF HOWEVER...AS HIGH CLOUDS AHEAD OF THE NEXT ROUND OF UNSETTLED
WEATHER WILL START STREAMING IN LATE CHRISTMAS AFTERNOON.

WEDNESDAY THROUGH THE END OF THE WEEK LOOKS UNSETTLED AND WET.
TRYING TO TIME THE SYSTEMS TO FOLLOW IS A LITTLE TOO PREMATURE AT
THIS POINT...BUT EXPECTING MOST AREAS TO GET SOME RAIN HEADING INTO
NEXT WEEKEND.

&&

.AVIATION...20/1800Z.
VFR CONDITIONS ARE EXPECTED THROUGHOUT THE PERIOD. THERE IS A 10%
CHANCE OF LOW-LEVEL WIND SHEAR AND TURBULENCE AT COASTAL AND VALLEY
TERMINALS OF LA COUNTY DUE TO GUSTY NE WINDS.

KLAX...VFR CONDS EXPECTED THROUGH THE PERIOD. THERE IS A 10% CHANCE
THAT EAST WINDS WILL EXCEED 10 KNOTS BETWEEN 18Z-21Z TODAY.

KBUR...VFR CONDITIONS ARE EXPECTED THROUGHOUT THE PERIOD. THERE IS A
10% CHANCE OF LOW-LEVEL WIND SHEAR AND TURBULENCE THROUGH 12Z FRI.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
FROST ADVISORY (SEE LAXNPWLOX).
HIGH SURF ADVISORY (SEE LAXCFWLOX).
SMALL CRAFT ADVISORY (SEE LAXMWWLOX).
SPECIAL WEATHER STATEMENT (SEE LAXSPSLOX).
HIGH RIP CURRENT RISK (SEE LAXSRFLOX).

&&

PUBLIC...KITTELL
AVIATION...SMITH
SYNOPSIS...SETO

WWW.WEATHER.GOV/LOSANGELES

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
845 AM PST THU DEC 20 2012

CAZ034>041-044>046-051>054-059-087-088-547-548-211400-
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-
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-
LOS ANGELES COUNTY SAN FERNANDO VALLEY-
LOS ANGELES COUNTY SAN GABRIEL VALLEY-
845 AM PST THU DEC 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.

.DAY ONE... TODAY AND TONIGHT

GUSTY NORTHEAST WINDS WILL AFFECT PORTIONS OF LOS ANGELES AND
VENTURA COUNTIES TODAY...WITH DIFFICULT DRIVING CONDITIONS. COLD
TEMPERATURES EXPECTED AGAIN TONIGHT...WITH AREAS OF SUB-FREEZING
TEMPERATURES POSING A THREAT TO OUTDOOR PLANT AND ANIMAL LIFE.

.DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY

COLD TEMPERATURES EXPECTED EARLY FRIDAY MORNING...WITH AREAS OF
SUB-FREEZING TEMPERATURES POSING A THREAT TO OUTDOOR PLANT AND
ANIMAL LIFE.

UNSETTLED WEATHER IS ANTICIPATED FROM THIS WEEKEND THROUGH CHRISTMAS
EVE. ONE WEAK STORM WILL MOVE ACROSS THE AREA FRIDAY NIGHT AND
SATURDAY...BRINGING LIGHT PRECIPITATION. ON SUNDAY NIGHT AND
MONDAY...A STRONGER SYSTEM WILL MOVE ACROSS THE AREA...BRINGING THE
THREAT OF SIGNIFICANT PRECIPITATION TO THE AREA.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

THOMPSON/RK