962
FXUS66 KLOX 170704
AFDLOX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
1204 AM PDT FRI OCT 17 2025
UPDATED AVIATION SECTION
SYNOPSIS
16/804 PM.
A LIGHT SANTA ANA PATTERN WILL OCCUR ON FRIDAY, BRINGING WARMER
TEMPERATURES TO THE AREA ALONG WITH LOCALLY BREEZY NORTHEAST
WINDS. DRY WEATHER WILL CONTINUE INTO NEXT WEEK BUT WITH COOLER
TEMPERATURES.
SHORT TERM (TDY-SUN)
16/805 PM.
***UPDATE***
MODELS CONTINUE TO SHOW GOOD AGREEMENT THROUGH THE SHORT TERM,
INCLUDING THE SURFACE PRESSURE AND HEIGHTS ALOFT. A HIGH PRESSURE
RIDGE WILL BUILD INTO THE AREA FROM THE WEST TONIGHT INTO FRIDAY,
WITH A WEAK CUTOFF LOW DEVELOPING SW OF POINT CONCEPTION FRIDAY
INTO EARLY NEXT WEEK. AT THE SURFACE, AN OFFSHORE HIGH PRESSURE
CENTER WILL BUILD INLAND THROUGH OREGON, SETTLING INTO THE GREAT
BASIN BY 5 AM FRIDAY MORNING. WITH A 1021 MB SURFACE HIGH OVER
NEVADA AND AN INVERTED TROUGH OF LOW PRESSURE ALONG THE SW
CALIFORNIA COAST, WEAK OFFSHORE GRADIENTS ARE EXPECTED TO
STRENGTHEN OVERNIGHT. THE NAM SHOWS -3.0 MB FOR THE LAX TO DAGGETT
GRADIENT AT 5 AM, SLIGHTLY STRONGER THAN EARLIER MODEL RUNS
DEPICTED. WITH ONLY LIMITED UPPER LEVEL SUPPORT EXPECT THE EVENT
TO BE SUB- ADVISORY, HOWEVER SOME LOCALIZED ADVISORY LEVEL GUSTS
COULD OCCUR IN THE MOST FAVORED LOCATIONS FOR SANTA ANA WINDS.
OVER THE VALLEYS EXPECT PEAK GUSTS TO BE 25 TO 30 MPH, WITH 35 TO
40 MPH IN THE MOUNTAINS, INCLUDING THE INTERIOR MOUNTAINS OF LA
AND VENTURA COUNTIES, AND THE WESTERN SANTA MONICAS.
OTHERWISE, EXPECT CLEAR SKIES OVERNIGHT WITH LOWS IN THE 50S FOR
THE COASTS AND VALLEYS, 40 TO 50 FOR THE ANTELOPE VALLEY AND
DIPPING INTO THE 30S OVER WIND SHELTERED INTERIOR AREAS. HIGHS ON
FRIDAY WILL BE UP ANYWHERE FROM 3 TO 10 DEGREES FROM TODAY'S
HIGHS. THIS MEANS MID 70S TO MID 80S ACROSS THE AREA, WITH 50S TO
60S OVER THE MOUNTAINS.
***FROM PREVIOUS DISCUSSION**
FOR FRIDAY AFTERNOON THROUGH SUNDAY, A DIURNAL FLOW PATTERN WILL
CONTINUE WITH WEAKENING OFFSHORE FLOW IN THE MORNING HOURS AND
GRADUALLY INCREASING ONSHORE FLOW IN THE AFTERNOON HOURS. SO, WITH
THE WEAKENING OFFSHORE GRADIENTS, DO NOT ANTICIPATE ANY CONCERN
FOR ADVISORY- LEVEL WINDS FRIDAY NIGHT OR SATURDAY NIGHT.
OTHERWISE, NO SIGNIFICANT ISSUES ARE EXPECTED. OVERALL, CLEAR
SKIES ARE EXPECTED ALTHOUGH THERE IS A CHANCE THAT SOME STRATUS
AND FOG COULD RETURN TO THE COASTAL PLAIN LATE SATURDAY NIGHT AND
SUNDAY MORNING. AS FOR TEMPERATURES, THE WEAK OFFSHORE FLOW IN THE
MORNING HOURS, RISING THICKNESSES AND LIMITED MARINE INFLUENCE
WILL ALLOW FOR A WARMING TREND FOR ALL AREAS THROUGH SATURDAY. BY
SUNDAY, THERE WILL BE SOME SLIGHT COOLING FOR THE COASTAL PLAIN
WITH PERSISTENCE/SLIGHT WARMING FOR INTERIOR SECTIONS.
LONG TERM (MON-THU)
16/115 PM.
FOR THE EXTENDED, 12Z MODELS CONTINUE TO EXHIBIT DECENT SYNOPTIC
AGREEMENT. BEGIN TO SHOW SOME SYNOPTIC DIFFERENCES, BUT NOTHING
THAT WILL GREATLY IMPACT THE FORECAST. UPPER LOW WILL CONTINUE TO
SPIN SOUTHWEST OF THE AREA ON MONDAY THEN WILL MOVE EASTWARD
ACROSS THE AREA TUESDAY/WEDNESDAY WITH A TROUGH APPROACHING THE
WEST COAST ON THURSDAY.
FORECAST-WISE, NO SIGNIFICANT ISSUES ARE EXPECTED THROUGH THE
PERIOD. THE UPPER LOW DOES NOT APPEAR TO ENTRAIN ANY MOISTURE AS
IT MOVES ACROSS THE AREA. SO, AT THIS TIME, THE CHANCES FOR ANY
MEASURABLE PRECIPITATION ARE VERY LOW (LESS THAN 10%). HOWEVER,
THE LOWERING H5 HEIGHTS AND THE RETURN OF WEAK ONSHORE FLOW, THE
MARINE LAYER STRATUS/FOG SHOULD GRADUALLY INCREASE IN DEPTH AND
AREAL COVERAGE. OTHER THAN THE STRATUS/FOG, SKIES SHOULD REMAIN
MOSTLY CLEAR THROUGH THE PERIOD. AS FOR TEMPERATURES, WILL EXPECT
A GENERAL COOLING TREND FOR ALL AREAS THROUGH WEDNESDAY WITH SOME
SLIGHT WARMING IN SOME INLAND AREAS ON THURSDAY.
AVIATION
17/0703Z.
AT 05Z, THE MARINE LAYER WAS 800 FT DEEP. THE TOP OF THE
INVERSION WAS AT 1900 FT WITH A TEMPERATURE OF 19 C.
THERE IS A 60% CHANCE FOR LIFR AT KPRB 10-16Z FRIDAY. OTHERWISE
HIGH CONFIDENCE IN VFR CONDITIONS.
NE WINDS WILL DEVELOP AGAIN ON FRIDAY, SLIGHTLY STRONGER AND MORE
EXPANSIVE THAN THURSDAY. 10-15 KNOTS AND/OR LLWS POSSIBLE AT
KSBP,KOXR, KCMA, KBUR, AND KVNY. LIGHT BUT NOTICEABLE UDDF OVER
AREA MOUNTAINS.
KLAX...HIGH CONFIDENCE IN VFR THROUGH AT LEAST 06Z SATURDAY. EAST
WINDS POSSIBLE 12-16Z BUT MODERATE CONFIDENCE THAT WINDS WILL STAY
UNDER 8 KNOTS.
KBUR....HIGH CONFIDENCE IN VFR CONDITIONS THROUGH FRIDAY. NE WINDS
IN THE AREA, BUT UNLIKELY TO CAUSE ISSUES AT THE TERMINAL.
MARINE
16/804 PM.
FOR THE WATERS SOUTHWEST THROUGH NORTHWEST OF THE CHANNEL ISLANDS
AND OUTSIDE THE SOUTHERN CALIFORNIA BIGHT, SMALL CRAFT ADVISORY
(SCA) LEVEL NORTHWEST WINDS WILL CONTINUE ACROSS THE WATERS FROM
POINT SAL SOUTH TO SAN NICOLAS ISLAND THROUGH TONIGHT INTO FRIDAY
MORNING, WITH WINDS STRONGEST NEAR PT CONCEPTION & PT ARGUELLO.
CONDITIONS WILL REMAIN RELATIVELY BENIGN FRIDAY THROUGH THE
WEEKEND, EXCEPT FOR LOCALIZED NORTHEAST WINDS OF 20-25 KNOTS
NEARSHORE FROM CAYUCOS POINT/MORRO BAY SOUTH TO PISMO BEACH EARLY
FRIDAY MORNING INTO THE EARLY AFTERNOON. THERE IS A 30% CHANCE
FOR SCA CONDITIONS ROUGHLY 50 NM FROM SHORE EARLY NEXT WEEK.
INSIDE THE SOUTHERN CALIFORNIA BIGHT, WINDS ARE EXPECTED TO REMAIN
BELOW SCA LEVELS THROUGH EARLY NEXT WEEK, WITH THE EXCEPTION OF
LOCALIZED NEARSHORE N-NE SCA LEVEL WINDS BETWEEN VENTURA HARBOR
AND POINT DUME LATE TONIGHT INTO FRIDAY MORNING (40% CHANCE).
LOWER CHANCES LATE FRIDAY NIGHT INTO SATURDAY MORNING BUT FOCUSED
MORE AROUND POINT DUME. DUE TO THE LOCALIZED NATURE OF THE WINDS,
ANY CHANCE OF A SMALL CRAFT ADVISORY ISSUANCE IS VERY LOW.
LOX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 AM PDT EARLY THIS
MORNING FOR ZONES 670-676. (SEE LAXMWWLOX).
SMALL CRAFT ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING
FOR ZONE 673. (SEE LAXMWWLOX).
PUBLIC...THOMPSON
AVIATION...KITTELL
MARINE...BLACK/LEWIS
SYNOPSIS...MW/CC
WEATHER.GOV/LOSANGELES
EXPERIMENTAL GRAPHICAL HAZARDOUS WEATHER OUTLOOK AT:
HTTPS://WWW.WEATHER.GOV/ERH/GHWO?WFO=LOX
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