Area Forecast Discussion
Issued by NWS Los Angeles, CA

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000
FXUS66 KLOX 041817
AFDLOX

SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
1000 AM PST WED MAR 4 2015

...AVIATION DISCUSSION UPDATED...

.SYNOPSIS...

HIGH PRESSURE WILL BUILD IN OVER THE REGION THROUGH THE WEEKEND
BRINGING WARMER TEMPERATURES AND MOSTLY CLEAR SKIES. TEMPERATURES
WELL ABOVE SEASONAL NORMALS WILL LINGER INTO EARLY NEXT WEEK.

&&

.SHORT TERM (TODAY-FRIDAY)...WEAK SANTA ANAS TODAY AS SURFACE HIGH
PRESSURE BUILDS OVER THE GREAT BASIN BEHIND THE WEEKEND STORM
SYSTEM. WINDS MOSTLY BELOW ADVISORY LEVELS AND EXPECTED TO STAY THAT
WAY THROUGH THE REST OF THE WEEK. TEMPS WARMER TODAY BUT ONLY
TOPPING OUT IN THE LOW 70S DUE TO LINGERING COLD AIR ADVECTION. A
RIDGE OF HIGH PRESSURE IS SLOWLY ADVANCING ACROSS THE ERN PACIFIC
AND THIS WILL BRING A MUCH WARMER AIR MASS WITH IT BY FRIDAY,
WARMING TEMPS UP INTO THE 80S FOR THE VALLEYS AND 70S FOR THE
BEACHES.

***FROM PREVIOUS DISCUSSION***

.LONG TERM (SATURDAY-TUESDAY)...

HIGH PRESSURE WILL KEEP A WARM AIR MASS IN PLACE THROUGH THE
WEEKEND...THEN A SERIES OF TROUGHS OF LOW PRESSURE WILL APPROACH
THE WEST COAST. TEMPERATURES WELL ABOVE SEASONAL NORMALS WILL
LINGER INTO EARLY NEXT WEEK. A SLIGHT COOLING TREND COULD START
TAKING SHAPE ALONG THE COAST ON SUNDAY...WITH A MORE PRONOUNCED
COOLING TREND DEVELOPING BETWEEN MONDAY AND TUESDAY. SKIES SHOULD
BE MOSTLY CLEAR...EXCEPT FOR SOME HIGH LEVEL CLOUDINESS STREAMING
OVER THE AREA. IT IS POSSIBLE THOUGH THAT PATCHY DENSE FOG COULD
DEVELOP ON MONDAY MORNING ALONG THE COAST AND AGAIN ON TUESDAY.

&&

.AVIATION...04/18Z...

AT 1745Z AT KLAX... THERE WAS NO INVERSION.

OVERALL...MODERATE TO HIGH CONFIDENCE IN THE 18Z TAFS. WEAK
OFFSHORE FLOW TODAY MAY GENERATE SOME TURBULENCE/LLWS ACROSS THE
VALLEYS AND FOOTHILLS THROUGH MID-AFTERNOON TODAY. A TWENTY PERCENT
CHANCE OF VLIFR-LIFR CONDITIONS AT KPRB AND KSMX AFTER 10Z.
OTHERWISE AND ELSEWHERE VFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD.

KLAX...HIGH CONFIDENCE IN THE 18Z TAF. VFR CONDITIONS WILL PREVAIL
THROUGHOUT THE FORECAST PERIOD.

KBUR...HIGH CONFIDENCE IN THE 18Z TAF.  WEAK OFFSHORE FLOW TODAY MAY
GENERATE SOME TURBULENCE/LLWS THROUGH MID-AFTERNOON.  OTHERWISE
VFR CONDITIONS WILL PREVAIL THROUGHOUT THE FORECAST PERIOD.

&&

.MARINE...04/900 AM...

WEAK TO LOCALLY MODERATE NORTHERLY FLOW ACROSS THE REGION THROUGH
FRIDAY WITH WEAK NORTHEAST FLOW NEAR THE IMMEDIATE COASTLINE.  FLOW
WILL BE LOCALLY MODERATE AT TIMES ALONG THE PORTIONS OF THE VENTURA
AND LOS ANGELES COUNTY COASTLINE AFFECTED BY SANTA ANA WINDS.  WIND
SPEEDS WILL INCREASE ON SATURDAY AND SUNDAY AND THERE IS A TWENTY
PERCENT CHANCE THEY MAY REACH SMALL CRAFT ADVISORY THRESHOLDS.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
NONE

&&
$$

PUBLIC...MW/HALL
AVIATION...KJ
MARINE...KJ
SYNOPSIS...JLD

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