032
FXUS66 KLOX 202125
AFDLOX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
225 PM PDT MON OCT 20 2025
SYNOPSIS
20/200 PM.
A DEEP MARINE LAYER WILL BRING CLOUDS AND SOME DRIZZLE TO ALL OF
THE COASTS AND VALLEYS ON WEDNESDAY. MAX TEMPERATURES ON
WEDNESDAY WILL FALL DRAMATICALLY WITH HIGHS ONLY IN THE MID 60S TO
LOWER 70S ACROSS ALL OF THE COASTS AND VLYS. DRY AND WARMER
CONDITIONS ARE SLATED FOR THE END OF THE WEEK.
SHORT TERM (TDY-THU)
20/159 PM.
A CUT-OFF LOW PRESSURE SYSTEM THAT WAS LOCATED TO OUR SOUTHWEST
THIS AFTERNOON, IS POISED TO MOVE OVERHEAD WEDNESDAY BEFORE
DEPARTING EAST THURSDAY. WE HAVE HIGH CONFIDENCE IN COOLING AND
MOISTENING TRENDS THROUGH WEDNESDAY ASSOCIATED WITH A DEEPENING
MARINE LAYER. ALTHOUGH WE CANNOT RULE OUT PATCHY DENSE FOG IN
COASTAL AREAS TONIGHT AHEAD OF THE SYSTEM.
THERE IS A 10-20 PERCENT CHANCE OF SHOWERS OR THUNDERSTORMS
FOCUSED ACROSS THE OCEAN TO SAN LUIS OBISPO COUNTY TUESDAY NIGHT,
BECOMING FOCUSED ACROSS THE INTERIOR MOUNTAINS OF SANTA BARBARA
AND VENTURA COUNTY WITH DRY LIGHTNING FIRE STARTS AND GUSTY WINDS
LIKELY BEING THE MAIN THREATS WITH ANY THUNDERSTORMS. ALTHOUGH WE
HIGHLIGHT SPECIFIC AREAS AND TIMES, CUT-OFF LOW PRESSURE SYSTEMS
ARE NOTORIOUSLY DIFFICULT TO FORECAST AND AS A RESULT A
THUNDERSTORM CANNOT BE RULED OUT ANYWHERE, ESPECIALLY AS THE
SYSTEM MOVES OVERHEAD ON WEDNESDAY. DRIZZLE IS ALSO LIKELY FOR
COASTAL AREAS TO COASTAL MOUNTAIN SLOPES, ESPECIALLY TUESDAY
EVENING THROUGH WEDNESDAY MORNING, ASSOCIATED WITH THE RAPIDLY
DEEPENING MARINA LAYER.
BREEZY WINDS ARE ANTICIPATED ESPECIALLY ACROSS HIGHER TERRAIN
WEDNESDAY INTO WEDNESDAY NIGHT, ALTHOUGH LIKELY REMAINING UNDER
ADVISORY LEVELS FOR MOST AREAS.
LONG TERM (FRI-MON)
20/159 PM.
A WARM UP IS EXPECTED THROUGH FRIDAY AHEAD OF OUR NEXT SYSTEM,
WHICH WILL PASS WELL TO OUR NORTH THIS WEEKEND. GUIDANCE CONTINUES
TO TREND DRIER WITH ONLY A 15-30 PERCENT CHANCE OF RAIN FOCUSED
SATURDAY NIGHT INTO SUNDAY FOR SAN LUIS OBISPO AND NORTHERN SANTA
BARBARA COUNTIES. ELSEWHERE, A DEEPENING MARINE LAYER COULD EKE
OUT SOME DRIZZLE. THE BIGGEST IMPACT MAY BE GUSTY WEST TO
NORTHWEST WINDS POTENTIALLY NEARING ADVISORY LEVELS FOCUSED ACROSS
THE HIGH TERRAIN AND SOUTHWEST SANTA BARBARA COUNTY. BEYOND THIS
SYSTEM THERE CONTINUES TO BE THE POTENTIAL FOR AT LEAST A MODERATE
NORTH TO OFFSHORE (SANTA ANA) WIND EVENT, ALTHOUGH GUIDANCE HAS
BACKED OFF OF THIS POTENTIAL A BIT. IT COULD BE A HOT ONE,
ESPECIALLY CLOSER TO THE COAST, AS A FAIRLY STOUT RIDGE FOR LATE
OCTOBER MAY BUILD OVERHEAD, FURTHER ADDING TO THE HEAT ASSOCIATED
WITH THE OFFSHORE FLOW.
AVIATION
20/1857Z.
AT 1801Z, THERE WAS A MARINE LAYER UP TO AROUND 1000 FEET, WITH A
WEAK INVERSION UP TO 1500 FEET WITH A MAXIMUM TEMPERATURE OF 21Z.
HIGH CONFIDENCE IN TAFS FOR KPRB, KBUR, KVNY, KPMD, AND KWJF.
MODERATE CONFIDENCE IN REMAINING TAFS. ARRIVAL OF LOW CLOUDS
TONIGHT MAY BE OFF +/- 3 HOURS, AND CLEARING TIMES OF ANY CIGS
THAT FORM TUE MORNING BY 90 MINUTES. CHANCE FOR A FEW HOURS OF
VLIFR TO IFR CONDS AT KSBA (10%) KOXR (25%), KCMA (15%), KSMO
(30%), KLAX (30%), AND KLGB (30%) FROM 06Z-18Z. THERE IS ALSO A
10-20% CHANCE OF VFR CONDITIONS THROUGH THE PERIOD AT ALL COASTAL
SITES WHERE CIGS ARE FORECASTED.
KLAX...MODERATE CONFIDENCE IN TAF. THERE IS A 30% CHANCE OF A FEW
HOURS OF 1-2SM VSBYS AND CIGS OVC003-006 BETWEEN 06Z AND 18Z
TUES. THERE IS ALSO A 15% CHANCE OF VFR THROUGH THE FORECAST
PERIOD. NO SIGNIFICANT EAST WIND COMPONENT EXPECTED.
KBUR...HIGH CONFIDENCE IN TAF.
MARINE
20/224 PM.
A LONG PERIOD NORTHWEST SWELL IS BRINGING 7-12 FOOT SEAS TO THE
OUTER WATERS AND NEARSHORE WATERS ALONG THE CENTRAL COAST, AND A
SMALL CRAFT ADVISORY (SCA) IN EFFECT THROUGH LATE TONIGHT FOR THE
HIGH SEAS (OUTER WATERS ONLY). THERE IS A CHANCE THAT THE
ADVISORY WILL BE EXTENDED THROUGH TONIGHT, FOLLOWED BY PERIODS OF
SCA LEVEL SEAS ON AND OFF THROUGH THE WEEK. SEAS ACROSS THE OUTER
WATERS WILL INCREASE TO 11-13 FEET LATE FRIDAY THROUGH THE
WEEKEND. SEAS ARE EXPECTED REMAIN BELOW SCA LEVELS INSIDE THE
SOUTHERN CALIFORNIA BIGHT, ALTHOUGH STEEP AND CHOPPY WIND WAVES
WILL OCCUR WEDNESDAY.
HIGH CONFIDENCE IN WINDS REMAINING REMAINING RELATIVELY LIGHT
THROUGH WEDNESDAY MORNING, THEN NORTHWESTERLY WINDS WILL INCREASE
TO 20-30 KNOTS ACROSS THE WATERS SOUTH OF POINT CONCEPTION,
INCLUDING THE INNER WATERS (SCA LIKELY). WINDS INSIDE THE
SOUTHERN CALIFORNIA BIGHT WILL DECREASE LATE WEDNESDAY NIGHT, BUT
SCA LEVEL NORTHWESTERLY WINDS WILL CONTINUE ACROSS THE OUTER
WATERS AND EXPAND TO THE NORTH THURSDAY THROUGH FRIDAY.
PATCHY DENSE FOG IS LIKELY ACROSS PORTIONS OF THE COASTAL WATERS
TONIGHT INTO LATE TUESDAY MORNING.
LOX WATCHES/WARNINGS/ADVISORIES
CA...HIGH SURF ADVISORY IN EFFECT UNTIL 9 PM PDT WEDNESDAY FOR
ZONES 340-346. (SEE LAXCFWLOX).
PZ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 9 PM PDT THIS EVENING
FOR ZONES 670-673. (SEE LAXMWWLOX).
PUBLIC...MUNROE
AVIATION...SCHOENFELD
MARINE...LEWIS/SCHOENFELD
SYNOPSIS...30
WEATHER.GOV/LOSANGELES
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