HAZARDOUS WEATHER OUTLOOK
Issue Date: 600 AM PST SUN DEC 6 2009
Expiration: 600 AM PST MON DEC 07 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.
.DAY ONE... TODAY
HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.
.DAYS TWO THROUGH SEVEN... MONDAY THROUGH SATURDAY
A LARGE COLD STORM WILL AFFECT THE AREA MONDAY. IT WILL PRODUCE 1 TO
1.5 INCHES OF RAIN OVER THE COASTS AND VALLEYS AND 1.5 TO 3 INCHES
OF RAIN OVER THE MOUNTAINS. 12 TO 18 INCHES OF SNOW IS POSSIBLE
ABOVE 6000 FEET. IT MAY PRODUCE RAINFALL INTENSITIES HIGH ENOUGH TO
CAUSE DEBRIS FLOWS IN THE RECENT BURN AREAS. MONDAY NIGHT AND
TUESDAY NORTH SLOPE CLOUDS AND COLD AIR WILL BRING SNOW TO ALMOST
ALL OF THE GRAPEVINE. A SECOND STORM WILL AFFECT THE AREA THURSDAY
AND FRIDAY MORNING AND A THIRD STORM MAY ARRIVE OVER THE WEEKEND.
* WINTER STORM WATCH.........SEE WWUS46 KLOX - WSWLOX 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.
SPECIAL WEATHER STATEMENT
Issue Date: 340 AM PST SUN DEC 6 2009
Expiration: 600 PM PST SUN DEC 06 2009
...POTENTIAL FOR SIGNIFICANT RAIN AND MOUNTAIN SNOW MONDAY FOLLOWED
BY COLD TEMPERATURES AND POTENTIAL FROST OR FREEZES FOR MANY AREAS
MONDAY NIGHT...
...POTENTIAL FOR ADDITIONAL STORMS TO AFFECT SOUTHERN AND CENTRAL
CALIFORNIA LATER NEXT WEEK...
A SERIES OF PACIFIC STORMS ARE EXPECTED TO MOVE INTO CALIFORNIA
NEXT WEEK...BRINGING PERIODS OF RAIN AND MOUNTAIN SNOW TO THE
STATE.
THE FIRST STORM WILL BRING AN INCREASING CHANCE FOR RAIN AND
MOUNTAIN SNOW ACROSS THE REGION LATE TONIGHT...WITH
PRECIPITATION OVERSPREADING THE ENTIRE FORECAST AREA ON MONDAY.
THIS FIRST STORM SYSTEM IS NOW TAKING AN OVER-WATER
TRAJECTORY...WHICH WILL INCREASE ITS RAINFALL PRODUCTION. RAINFALL
ESTIMATES WITH THIS SYSTEM ARE NOW EXPECTED TO RANGE BETWEEN .50 AND
1.50 INCHES ACROSS MOST AREAS...WITH 1.50 TO 3.00 INCHES EXPECTED
ACROSS SOUTH AND SOUTHWEST FACING FOOTHILL AND MOUNTAIN LOCATIONS.
THE HIGHEST RAINFALL AMOUNTS ARE EXPECTED ACROSS LOS ANGELES
COUNTY...ESPECIALLY ACROSS THE SAN GABRIEL MOUNTAINS AND ADJACENT
FOOTHILLS.
THE GREATEST THREAT OF PRECIPITATION FOR THE STATION FIRE BURN AREA
WILL BE LATE MONDAY MORNING THROUGH EARLY MONDAY EVENING. DURING THIS
TIME...THERE WILL LIKELY BE PERIODS OF MODERATE RAIN...WITH THE
POTENTIAL FOR OCCASIONAL HEAVY RAINFALL. RAINFALL RATES ACROSS THE
STATION BURN AREA ARE GENERALLY EXPECTED TO RANGE BETWEEN ONE
QUARTER AND ONE THIRD OF AN INCH PER HOUR FROM LATE MONDAY MORNING
THROUGH EARLY MONDAY EVENING. HOWEVER...SINCE THE AIR MASS WILL BE
COLD AND SLIGHTLY UNSTABLE...THERE WILL BE THE POTENTIAL FOR BRIEF
HEAVY SHOWERS...WHERE RAINFALL RATES COULD REACH AS HIGH AS ONE HALF
INCH PER HOUR MONDAY AFTERNOON INTO EARLY MONDAY EVENING ACROSS THE
STATION FIRE BURN AREA. THE INCREASED THREAT OF HIGHER RAINFALL
AMOUNTS AND INTENSITIES WILL BRING GREATER CONCERN FOR THE POTENTIAL
FOR DEBRIS FLOWS IN RECENT BURN AREAS...INCLUDING THE STATION FIRE
BURN AREA. AS WE DRAW CLOSER TO THE EVENT...A FLASH FLOOD WATCH MAY
BE NEEDED FOR THE RECENT BURN AREAS.
THIS STORM WILL ALSO BRING THE POTENTIAL FOR SIGNIFICANT SNOW AND
STRONG WINDS ACROSS HIGHER MOUNTAIN ELEVATIONS. BEHIND THE FRONT...
SNOW LEVELS WILL FALL RAPIDLY MONDAY NIGHT AS VERY COLD AIR SPREADS
ACROSS THE REGION. LATER MONDAY NIGHT...SNOW LEVELS COULD FALL AS
LOW AS 2000 FEET...BRINGING THE POTENTIAL FOR SNOW SHOWERS ACROSS
THE ANTELOPE VALLEY...CUYAMA VALLEY...AND MUCH OF THE INTERSTATE 5
CORRIDOR NORTH OF CASTAIC. THE VERY COLD AIR MASS WILL LIKELY CREATE
DANGEROUS ICY CONDITIONS IN THE MOUNTAINS...ALONG WITH THE POTENTIAL
FOR AREAS OF FROST AND FREEZES IN LOCATIONS FREE FROM PRECIPITATION
AND WINDS. FOR MORE INFORMATION ON WINTER WEATHER
CONDITIONS...PLEASE REFER TO THE LATEST WINTER STORM WATCH PRODUCT.
LATER IN THE WEEK...A SECOND STORM WILL LIKELY IMPACT SOUTHERN AND
CENTRAL CALIFORNIA THURSDAY INTO FRIDAY. THERE STILL EXISTS
CONSIDERABLE UNCERTAINTY IN THE EXACT PLACEMENT...INTENSITY AND
AMOUNT OF RAINFALL ACROSS THE AREA. SINCE THIS STORM COULD PRODUCE
MORE PRECIPITATION THAN MONDAYS STORM...RESIDENTS AND LOCAL
EMERGENCY OFFICIALS ARE URGED TO STAY TUNED TO THE LATEST NATIONAL
WEATHER SERVICE FORECASTS FOR UPDATES ON THIS DEVELOPING WEATHER
SITUATION.
A THIRD SYSTEM REMAINS A POSSIBILITY FOR NEXT WEEKEND...WHICH WOULD
BRING ADDITIONAL PRECIPITATION TO THE REGION.
THESE STORMS WILL LIKELY GENERATE LARGE SWELLS AND HIGH SURF
CONDITIONS AT TIMES NEXT WEEK. PLEASE REFER TO THE LATEST MARINE
WEATHER STATEMENT FOR THE LATEST DETAILS ACROSS THE COASTAL WATERS.
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