Area Forecast Discussion
Issued by NWS Los Angeles, CA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KLOX 300421
AFDLOX

SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
820 PM PST THU JAN 29 2015

.SYNOPSIS...
A TROUGH OF LOW PRESSURE WILL BRING MOIST NORTHEAST FLOW INTO THE
AREA...WITH A FEW SHOWERS POSSIBLE FOR LOS ANGELES COUNTY FRIDAY AND
FRIDAY NIGHT. OFFSHORE WINDS WILL INCREASE BY SATURDAY NIGHT THROUGH
SUNDAY MORNING. HIGH PRESSURE WILL BRING WARMER TEMPERATURES AND
MOSTLY CLEAR SKIES OVER THE WEEKEND AND INTO NEXT WEEK.

&&

.SHORT TERM (TONIGHT-SUN)...AN UPPER LEVEL TROUGH EXTENDING FROM OFF
OF BAJA INTO CA WAS CONTINUING TO STREAM MOISTURE INTO THE FORECAST
AREA THIS EVENING BY WAY OF MID AND HI CLOUDS. THE CLOUDINESS WAS
CONFINED MAINLY TO VENTURA AND LOS ANGELES COUNTIES. RADAR WAS
SHOWING SOME LIGHT RAIN SHOWERS OR SPRINKLES OVER PORTIONS OF L.A.
COUNTY AS WELL. LITTLE CHANGE IN THIS PATTERN CAN BE EXPECTED
OVERNIGHT. PATCHY DENSE FOG WILL ONCE AGAIN BE POSSIBLE IN THE
SALINAS RIVER VALLEY LATE TONIGHT. WILL UPDATE THE ZONES THIS
EVENING TO ADD LIGHT SHOWERS OR SPRINKLES TO L.A. COUNTY OVERNIGHT.

THE UPPER TROF WILL STRENGTHEN INTO AN UPPER LEVEL LOW OVER SERN CA
ON FRI...THEN MOVE VERY LITTLE FRI NIGHT. THE UPPER LOW WILL BE
SHUNTED SOUTH ON SAT AS AN UPPER RIDGE BUILDS INTO NORTHERN CA. THE
UPPER RIDGE IS FORECAST TO MOVE INTO CENTRAL CA BY SUN MORNING. A
SLIGHT CHANCE OF SHOWERS OVERALL CAN BE EXPECTED FOR MUCH OF L.A.
COUNTY ON FRI AND FRI NIGHT...WITH A FEW LEFTOVER SHOWERS ON THE N
SLOPES OF THE SAN GABRIELS SAT MORNING. RAINFALL AMOUNTS WILL BE
LIGHT WHERE RAIN OCCURS...WITH GENERALLY LESS THAN 0.10 INCH...ALTHO
MOST AREAS SHOULD LESS THAN 0.05 INCH. ANY SNOW IN THE MOUNTAINS
WILL BE CONFINED TO ELEVATIONS GENERALLY ABOVE 7000 FEET AND BE VERY
LIGHT. OTHERWISE...VARYING AMOUNTS OF CLOUDS WILL PREVAIL FRI INTO
SAT MORNING FOR VTU/L.A. COUNTIES...WITH CLEAR TO PARTLY CLOUDY
SKIES OVER SLO/SBA COUNTIES. SKIES SHOULD BECOME MOSTLY CLEAR FOR
ALL AREAS BY LATER SAT AND CONTINUE THRU SUN. WEAK OFFSHORE FLOW
WILL CONTINUE FRI MORNING...THEN INCREASE AND BECOME GUSTY
ESPECIALLY OVER HIGHER TERRAIN FRI NIGHT INTO SAT MORNING...AND
AGAIN SAT NIGHT INTO SUN MORNING. SOME GUSTS IN THE L.A./VTU COUNTY
MTNS COULD APPROACH ADVISORY LEVELS AT TIMES OVER THE WEEKEND. TEMPS
ACROSS THE REGION ARE EXPECTED TO BE NEAR TO SLIGHTLY ABOVE NORMAL
ON FRI...THEN WARM TO SEVERAL DEGREES ABOVE NORMAL IN ALL AREAS BY
SUN.

***FROM PREVIOUS DISCUSSION***

.LONG TERM (MON-THU)...A MODERATELY STRONG RIDGE OF HIGH PRESSURE
(ESPECIALLY FOR JANUARY) WILL SETTLE OVER THE WEST COAST NEXT WEEK
AND REMAIN THERE FOR MOST IF NOT ALL OF THE WEEK. ABOVE NORMAL
TEMPERATURES WILL PREDOMINATELY CLEAR SKIES WILL BE THE NORMAL.
PRESSURE GRADIENTS WILL BE AROUND NEUTRAL THROUGH THE PERIOD...WITH
NOT MUCH IN THE WAY OF WINDS TO MENTION.

&&

.AVIATION...30/0010Z.

AT 2305Z...THERE WAS A SURFACE BASED INVERSION AT KLAX...WITH THE
INVERSION TOP AT 800 FT AND A TEMPERATURE OF 21 DEGREES CELSIUS.

GENERALLY HI CONFIDENCE IN THE 00Z TAFS...EXCEPT MODERATE CONFIDENCE
AT KPRB...WHERE THERE IS A 50-60 PERCENT CHANCE OF LIFR CONDITIONS
LATE TONIGHT AND FRI MORNING. OTHERWISE...MOSTLY VFR CONDITIONS WITH
VARYING AMOUNTS OF MAINLY MID AND HI CLOUDS ARE EXPECTED AT THE
AIRFIELDS THRU FRI. PERIODS OF MVFR VSBYS ARE ALSO EXPECTED LATER
TONIGHT AND FRI MORNING AT KSBP...KLAX AND KLGB. IN ADDITION...LOWER
LEVEL CLOUDS WITH VFR CIGS SHOULD AFFECT KLAX AND KLGB ON FRI...WITH
A 20 PERCENT CHANCE OF MVFR CIGS AT TIMES. THERE IS A 20 PERCENT
CHANCE OF SHOWERS IN LOS ANGELES COUNTY FRI AFTERNOON AND EVENING.

KLAX...HI CONFIDENCE OVERALL IN THE 00Z TAF. VFR CONDITIONS WITH
MOSTLY MID AND HI CLOUDS ARE EXPECTED THRU FRI MORNING. A PERIOD OF
LOWER LEVEL CLOUDS AND VFR CIGS ARE EXPECTED FRI AFTERNOON AND
EVENING...WITH A 20 PERCENT CHANCE OF MVFR CIGS AT TIMES. THERE IS
ALSO A 20 PERCENT CHANCE OF SHOWERS FRI AFTERNOON AND EVENING.

KBUR...HI CONFIDENCE IN THE 00Z TAF. VFR CONDITIONS WITH MOSTLY MID
AND HI LEVEL CLOUDS ARE EXPECTED THRU FRI AFTERNOON. THERE IS ALSO A
20 PERCENT CHANCE OF SHOWERS FRI AFTERNOON.

&&

.MARINE...29/800 PM.

OUTER WATERS...SMALL CRAFT ADVISORY LEVEL WINDS WILL PERSIST THROUGH
LATE FRIDAY NIGHT...AND WHILE WINDS MAY DIMINISH SOME FRIDAY MORNING
THEY ARE EXPECTED TO INCREASE AGAIN FRIDAY AFTERNOON. A BUILDING
LONG PERIOD WEST SWELL WILL AFFECT THE WATERS TONIGHT INTO SATURDAY.

INNER WATERS...FROM BETWEEN VENTURA AND MALIBU...NE WINDS 10 TO 20
KT LATE FRIDAY NIGHT INTO SATURDAY MORNING...AND 20 TO 25 KT
SATURDAY NIGHT INTO SUNDAY MORNING. 70 PERCENT CHANCE FOR A SMALL
CRAFT ADVISORY FOR SUNDAY MORNING FOR THIS AREA.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY (SEE LAXMWWLOX).

&&

$$

PUBLIC...SIRARD/KITTELL
AVIATION...SIRARD
MARINE...SMITH
SYNOPSIS...B

WWW.WEATHER.GOV/LOSANGELES





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.