SPECIAL WEATHER STATEMENT
Issue Date: 327 PM PST FRI NOV 27 2009
Expiration: 400 AM PST SAT NOV 28 2009
...COLD PACIFIC STORM WILL BRING A THREAT OF SHOWERS AND MOUNTAIN
SNOW TONIGHT INTO SATURDAY...
A COLD UPPER LEVEL LOW PRESSURE SYSTEM IS EXPECTED TO TRACK SOUTHWARD INTO
SOUTHERN CALIFORNIA TONIGHT INTO SATURDAY. THERE IS STILL SOME UNCERTAINTY OF
THE EXACT TRACK OF THIS COLD UPPER LEVEL LOW PRESSURE SYSTEM...WHICH
WILL HAVE A SIGNIFICANT IMPACT ON RAINFALL PROBABILITY AND ASSOCIATED
RAINFALL AMOUNTS ACROSS OUR REGION.
AT THIS TIME...IT APPEARS THAT THE SYSTEM WILL TAKE A MORE OVER-LAND
TRAJECTORY WHICH WOULD LIMIT THE AVAILABLE MOISTURE. HOWEVER...THIS
IS A COLD AND DYNAMIC SYSTEM...BRINGING THE THREAT OF BRIEF HEAVY
SHOWERS AS WELL AS A SLIGHT CHANCE OF THUNDERSTORMS WITH SMALL HAIL.
THE THREAT OF SHOWERS IS EXPECTED TO BEGIN ACROSS SAN LUIS OBISPO
AND SANTA BARBARA COUNTIES LATE THIS AFTERNOON OR
EVENING...SPREADING DOWN THE COAST INTO VENTURA AND LOS ANGELES
COUNTIES OVERNIGHT. DUE TO THE SHOWERY NATURE OF THE
PRECIPITATION...RAINFALL AMOUNTS WILL BE QUITE VARIABLE. MOST COASTAL
AND VALLEY AREAS ARE EXPECTED TO RECEIVE LESS THAN A QUARTER OF AN INCH OF
RAINFALL...BUT MOUNTAIN AREAS COULD RECEIVE BETWEEN ONE QUARTER AND ONE
HALF INCH OF RAINFALL. LOCALLY HIGHER RAINFALL TOTALS WILL BE POSSIBLE
NEAR HEAVIER SHOWERS OR THUNDERSTORMS. WHILE THERE IS A VERY SLIGHT CHANCE
OF A THUNDERSTORM MOVING OVER ONE OF THE RECENT BURN AREAS...INCLUDING THE
STATION FIRE BURN AREA...IT DOES NOT APPEAR TO BE A SUFFICIENT THREAT
TO ISSUE A FLASH FLOOD WATCH FOR THE BURN AREAS AT THIS TIME. IF THIS SYSTEM
ENDS UP MOVING FURTHER WEST AND PICKS UP A MORE OVER-WATER TRAJECTORY...
PROJECTED RAINFALL AMOUNTS WOULD NEED TO BE INCREASED.
THIS WILL BE A COLD STORM SYSTEM...WITH SNOW LEVELS FALLING TO AROUND
4000 FEET LATER TONIGHT INTO SATURDAY...WITH SNOW LOCALLY FALLING
TO AROUND 3500 FEET IN HEAVIER SHOWERS AND ACROSS NORTH FACING
SLOPES. THE LOW SNOW LEVELS WILL LIKELY IMPACT THE INTERSTATE 5 CORRIDOR
NEAR THE GRAPEVINE...AND COULD BRING SOME SNOWFALL TO THE FOOTHILLS
OF THE ANTELOPE VALLEY AND CUYAMA VALLEY. PLEASE REFER TO THE LATEST WINTER
WEATHER ADVISORY PRODUCT FOR MORE DETAILS ON EXPECTED WINTER WEATHER
CONDITIONS.
BEHIND THIS SYSTEM...THERE WILL BE A RETURN OF GUSTY NORTHEAST WINDS
ACROSS SOUTHERN CALIFORNIA SUNDAY INTO MONDAY. INITIALLY...THE AIR
MASS IS EXPECTED TO REMAIN RATHER MOIST SUNDAY MORNING...BUT A DRYING
TREND IS EXPECTED LATER SUNDAY INTO MONDAY. WHILE THERE WILL BE
HEIGHTENED FIRE WEATHER CONCERNS WITH THIS OFFSHORE EVENT...IT IS
STILL UNCLEAR IF WEATHER AND FUEL CONDITIONS WILL REACH CRITICAL RED
FLAG THRESHOLDS.
HAZARDOUS WEATHER OUTLOOK
Issue Date: 321 PM PST FRI NOV 27 2009
Expiration: 600 AM PST SAT NOV 28 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.
.DAY ONE... TODAY/TONIGHT
A LARGE NW SWELL WILL CONTINUE TO CREATE HIGH SURF ALONG ALL
SOUTHERN CALIFORNIA BEACHES. SURF WILL RANGE FROM 7 TO 10 FEET WITH
LOCAL SETS TO 12 FEET. THERE WILL BE A HIGH THREAT FOR RIP CURRENTS
THROUGH THE PERIOD.
A COLD STORM WITH THE POTENTIAL FOR MOUNTAIN SNOW WILL ARRIVE
TONIGHT. THE SYSTEMS WEAKENING COLD FRONT WILL ARRIVE THIS AFTERNOON
BRINGING WIND AND A CHANCE FOR RAIN FROM SANTA BARBARA NORTHWARD.
THE FRONT WILL MOVE SOUTH THROUGHOUT THE EVENING...POSSIBLY
SPREADING ISOLATED TO SCATTERED LIGHT SHOWERS INTO LOS ANGELES AND
VENTURA COUNTIES OVERNIGHT.
THE SYSTEMS COLD AND UNSTABLE AIR WILL ARRIVE LATE TONIGHT...
CONTINUING A THREAT OF SHOWERS FOR THE COASTAL AND VALLEY AREAS.
DUE TO THE SYSTEMS INTERIOR TRACK...THE HIGHEST CHANCE OF
PRECIPITATION WILL OCCUR OVER INTERIOR SAN LUIS OBISPO AND SANTA
BARBARA COUNTIES...AND THE NORTHERN SLOPES OF THE MOUNTAINS. A
POTENTIAL EXISTS FOR THE SEASONS FIRST ACCUMULATING SNOWFALL ALONG
THE INTERSTATE 5 CORRIDOR BEGINNING LATE TONIGHT. SNOW LEVELS WILL
LIKELY LOWER TO NEAR 4000 FEET LATE TONIGHT...LOCALLY LOWERING TO
3500 FEET IN HEAVIER SHOWERS. MOTORISTS PLANNING TRAVEL BETWEEN THE
LOS ANGELES METRO AREAS AND THE SAN JOAQUIN ARE ADVISED TO PREPARE
ACCORDINGLY FOR WINTER DRIVING CONDITIONS.
* WIND ADVISORY..............SEE WWUS76 KLOX - NPWLOX FOR DETAILS *
* WINTER WEATHER ADVISORY....SEE WWUS46 KLOX - WSWLOX FOR DETAILS *
* GALE WARNING...............SEE WHUS76 KLOX - MWWLOX FOR DETAILS *
* HIGH SURF ADVISORY.........SEE WHUS46 KLOX - CFWLOX FOR DETAILS *
* HIGH RIP CURRENT RISK......SEE FZUS56 KLOX - SRFLOX FOR DETAILS *
* MARINE WEATHER STATEMENT...SEE FZUS76 KLOX - MWSLOX FOR DETAILS *
* SPECIAL WEATHER STATEMENT..SEE WWUS86 KLOX - SPSLOX FOR DETAILS *
.DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY
A LARGE NW SWELL WILL CONTINUE TO CREATE HIGH SURF AT BEACHES SOUTH
OF POINT CONCEPTION THROUGH SUNDAY MORNING. SURF WILL RANGE FROM 6
TO 9 FEET WITH LOCAL SETS TO 10 FEET.
THE POTENTIAL FOR MOUNTAIN SNOW WILL CONTINUE THROUGH SATURDAY
EVENING. SNOW LEVELS WILL LIKELY HOVER NEAR 4000 FEET...LOCALLY
LOWERING TO 3500 FEET IN HEAVIER SHOWERS. MOTORISTS PLANNING TRAVEL
BETWEEN THE LOS ANGELES METRO AREAS AND THE SAN JOAQUIN ARE ADVISED
TO PREPARE ACCORDINGLY FOR WINTER DRIVING CONDITIONS.
AN OFFSHORE FLOW PATTERN DEVELOPING BEHIND THE SYSTEM WILL DEVELOP
GUSTY NORTHEAST WINDS ACROSS SOUTHERN CALIFORNIA SATURDAY NIGHT
THROUGH MONDAY. INITIALLY...THE AIR MASS IS EXPECTED TO REMAIN
RATHER MOIST SUNDAY MORNING...BUT A DRYING TREND IS EXPECTED LATER
SUNDAY INTO MONDAY. WHILE THERE WILL BE HEIGHTENED FIRE WEATHER
CONCERNS WITH THIS OFFSHORE EVENT...IT DOES NOT LOOK LIKE WE WILL
REACH CRITICAL RED FLAG THRESHOLDS.
* WIND ADVISORY..............SEE WWUS76 KLOX - NPWLOX FOR DETAILS *
* WINTER WEATHER ADVISORY....SEE WWUS46 KLOX - WSWLOX FOR DETAILS *
* GALE WARNING...............SEE WHUS76 KLOX - MWWLOX FOR DETAILS *
* HIGH SURF ADVISORY.........SEE WHUS46 KLOX - CFWLOX FOR DETAILS *
* MARINE WEATHER STATEMENT...SEE FZUS76 KLOX - MWSLOX FOR DETAILS *
* SPECIAL WEATHER STATEMENT..SEE WWUS86 KLOX - SPSLOX FOR DETAILS *
.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
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