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Tuesday, April 30, 2013

RED FLAG WARNING - URGENT - FIRE WEATHER MOUNTAINS OF VENTURA AND LOS ANGELES COUNTIES

Red Flag Warning


A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW... OR WILL SHORTLY. A COMBINATION OF STRONG WINDS... LOW RELATIVE HUMIDITY... AND WARM TEMPERATURES WILL CREATE EXTREME FIRE BEHAVIOR.
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Last map update: Apr, 30th 2013 at 2:10:05 pm PDT
URGENT - FIRE WEATHER MESSAGE

NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
1010 AM PDT TUE APR 30 2013

RED FLAG WARNING IN EFFECT FROM 5 AM WEDNESDAY UNTIL 5 PM PDT
THURSDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE
MOUNTAINS OF VENTURA AND LOS ANGELES COUNTIES...THE VENTURA
VALLEYS AS WELL AS THE SANTA CLARITA AND SAN FERNANDO VALLEYS...

RED FLAG WARNING IN EFFECT FROM 8 PM WEDNESDAY UNTIL 5 PM PDT
THURSDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE SANTA
MONICA MOUNTAINS...

SURFACE HIGH PRESSURE WILL BUILD ACROSS THE GREAT BASIN ON
WEDNESDAY SETTING THE STAGE FOR AN EXTENDED PERIOD OF WARM AND
DRY OFFSHORE FLOW. GUSTY NORTHEAST WINDS ARE EXPECTED TO DEVELOP
ACROSS THE MOUNTAINS OF VENTURA AND LOS ANGELES COUNTIES LATE
TUESDAY NIGHT...THEN WILL FILTER DOWN INTO THE VALLEYS DURING THE
DAY ON WEDNESDAY. INITIALLY...THE VALLEY WINDS WILL BE CONFINED
TO THE FOOTHILL REGIONS BORDERING THE VENTURA AND LA MOUNTAINS
SUCH AS PORTER RANCH...SAUGUS...AND EASTERN SIMI VALLEY DUE TO A
LINGERING MARINE INVERSION WHICH WILL DELAY THE ONSET OF GUSTY
WINDS AND LOW HUMIDITIES. FOR THE REMAINDER OF THE VALLEYS AS WELL
AS THE SANTA MONICA MOUNTAINS RED FLAG CONDITIONS ARE EXPECTED TO
OCCUR BY WEDNESDAY EVENING. AS THE WINDS DEVELOP...RELATIVE
HUMIDITY WILL BEGIN TO FALL DRAMATICALLY...QUICKLY DROPPING INTO
THE TEENS AND SINGLE DIGITS WITH POOR OVERNIGHT RECOVERIES.

THE EXPECTED COMBINATION OF GUSTY NORTHEAST WINDS...VERY LOW
RELATIVE HUMIDITY AND HIGH TEMPERATURES...WILL PRODUCE AN EXTENDED
PERIOD OF CRITICAL FIRE WEATHER CONDITIONS. WINDS ARE EXPECTED TO
BE MUCH WEAKER ON FRIDAY...HOWEVER TEMPERATURES WILL BE HOTTER
AND SINGLE DIGIT HUMIDITIES ARE EXPECTED TO CONTINUE. AS A
RESULT...CRITICAL FIRE WEATHER CONDITIONS MAY CONTINUE INTO THE
DAY ON FRIDAY AND MAY REQUIRE THE EXTENSION OF THE RED FLAG
WARNINGS OVER PART OR ALL OF THE AREA CURRENTLY INCLUDED IN THE
WARNING.

...RED FLAG WARNING IN EFFECT FROM 5 AM WEDNESDAY TO 5 PM PDT
THURSDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR THE
MOUNTAINS OF VENTURA AND LOS ANGELES COUNTIES...

THE NATIONAL WEATHER SERVICE IN LOS ANGELES/OXNARD HAS ISSUED A
RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY...WHICH
IS IN EFFECT FROM 5 AM WEDNESDAY TO 5 PM PDT THURSDAY. THE FIRE
WEATHER WATCH IS NO LONGER IN EFFECT.

* WINDS: NORTHEAST 20 TO 30 MPH WITH GUSTS TO 55 MPH.

* TIMING: NORTHEAST WINDS WILL INCREASE AFTER MIDNIGHT
  TONIGHT...AND PEAK WEDNESDAY MORNING. AFTER A BIT OF A LULL
  WEDNESDAY AFTERNOON AND EVENING...THE WINDS WILL INCREASE YET
  AGAIN WEDNESDAY NIGHT AND THURSDAY MORNING.

* RELATIVE HUMIDITY: RELATIVE HUMIDITY WILL FALL INTO THE
  SINGLE DIGITS AND LOW TEENS ON WEDNESDAY AND THURSDAY WITH
  LITTLE OR NO RECOVERY WEDNESDAY NIGHT.

* TEMPERATURES: DAYTIME READINGS IN THE MID 80S TO MID 90S AT
  LOWER ELEVATIONS TO THE 70S TO LOWER 80S AT HIGHER ELEVATIONS.
  OVERNIGHT LOWS IN THE 50S AND 60S.

* IMPACTS: IF FIRE IGNITION OCCURS...THERE COULD BE RAPID
  SPREAD OF WILDFIRE THAT WOULD LEAD TO A THREAT OF LIFE AND
  PROPERTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL
CREATE EXTREME FIRE BEHAVIOR. PLEASE ADVISE THE APPROPRIATE
OFFICIALS OR FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING.



HAZARDOUS WEATHER OUTLOOK

UPDATED NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 931 AM PDT TUE APR 30 2013 CAZ034>041-044>046-051>054-059-087-088-547-548-011300

 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-

931 AM PDT TUE APR 30 2013
 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.

 DAY ONE: TODAY AND TONIGHT:
 GUSTY ONSHORE WINDS WILL DEVELOP ACROSS THE ANTELOPE VALLEY THIS AFTERNOON AND LAST INTO THE EVENING...BRINGING POTENTIALLY HAZARDOUS DRIVING CONDITIONS. WITH WIND ADVISORY
DAYS TWO THROUGH SEVEN: WEDNESDAY THROUGH MONDAY GUSTY OFFSHORE WINDS AND EXTREMELY DRY AND WARM CONDITIONS WILL BRING CRITICAL FIRE WEATHER CONDITIONS TO INTERIOR PORTIONS WEDNESDAY THROUGH FRIDAY. THESE WINDS WILL ALSO BRING HAZARDOUS DRIVING CONDITIONS FOR HIGH PROFILE VEHICLES WEDNESDAY AND THURSDAY.
HIGH TEMPERATURES NEAR 100 AND APPROACHING RECORDS ARE EXPECTED FOR THE END OF NEXT WEEK OVER THE WARMEST VALLEYS.
DISCUSSION: POTENTIAL OFFSHORE WINDS WITH VERY WARM AND DRY CONDITIONS FOR INTERIOR SOUTHWEST CALIFORNIA BY MIDWEEK.
 ELEVATED FIRE DANGER FOR INTERIOR SOUTHWEST CALIFORNIA WEDNESDAY THROUGH FRIDAY.
 AN UPPER LEVEL TROUGH IS EXPECTED TO DIVE SOUTHWARD ACROSS THE GREAT BASIN INTO THE FOUR CORNERS AREA ON WEDNESDAY.
 WHILE AN UPPER LEVEL HIGH PRESSURE SYSTEM BUILDS OFF THE COAST OF NORTHERN CALIFORNIA. SURFACE HIGH PRESSURE WILL BUILD OVER THE GREAT BASIN WEDNESDAY INTO THURSDAY POTENTIALLY SETTING THE STAGE FOR A LATE SEASON OFFSHORE WIND EVENT FOR SOUTHWEST CALIFORNIA.
 AT THIS POINT THERE IS STILL SOME UNCERTAINTY IN THE STRENGTH AND AREAL EXTENT OF THE OFFSHORE WINDS. HOWEVER THERE ARE PRELIMINARY INDICATIONS THAT MODERATE OFFSHORE WINDS COULD DEVELOP AS EARLY AS WEDNESDAY ACROSS THE MOUNTAINS AND DESERTS SPREADING INTO THE VALLEYS OF LOS ANGELES AND VENTURA COUNTIES LATE WEDNESDAY INTO THURSDAY. 
 WEAKER OFFSHORE FLOW WILL LIKELY CONTINUE INTO FRIDAY. THERE IS GROWING CONFIDENCE OF AN EXTENDED PERIOD OF VERY WARM AND DRY CONDITIONS FOR INLAND AREAS FROM WEDNESDAY THROUGH FRIDAY.
 THE WARMEST DAYS WILL LIKELY BE THURSDAY AND FRIDAY  WHEN MOST VALLEY AREAS COULD SOAR INTO THE 90S.
 IT IS STILL QUESTIONABLE HOW MUCH WARMING THERE WILL BE NEAR THE COAST AS A SHALLOW MARINE LAYER INFLUENCE MAY MODERATE TEMPERATURES.
 THE OFFSHORE WINDS WILL ALSO BRING THE POTENTIAL FOR PROLONGED PERIODS OF SINGLE DIGIT HUMIDITIES ACROSS INTERIOR SECTIONS WEDNESDAY THROUGH FRIDAY. DURING THIS TIME THE VERY LOW HUMIDITIES IN COMBINATION WITH THE GUSTY OFFSHORE WINDS AND VERY WARM TEMPERATURES WILL BRING ELEVATED FIRE DANGER TO INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA ESPECIALLY CONSIDERING THE UNUSUALLY DRY FUELS FOR THIS TIME OF YEAR.
 AS WE DRAW CLOSER TO THE EVENT A FIRE WEATHER WATCH HAS BEEN ISSUED FOR THE POTENTIAL OF CRITICAL RED FLAG CONDITIONS.

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****REMINDER**** Every fire has the ability to be catastrophic. The wildland fire management environment has profoundly changed. Growing numbers of communities, across the nation, are experiencing longer fire seasons; more frequent, bigger, and more severe, fires are a real threat. Be careful with all campfires and equipment.
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