798
FXUS66 KSGX 271237
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
437 AM PST THU NOV 27 2025
SYNOPSIS
WEAKENING SANTA ANA WINDS WILL CONTINUE INTO THIS MORNING WITH THE
STRONGER GUSTS MOSTLY 35 MPH OR LESS. INLAND AREAS WILL REMAIN
WARM AND VERY DRY TODAY WHILE HIGH TEMPERATURES FOR COASTAL AREAS
COOL AROUND 5 DEGREES. FOR FRIDAY THROUGH SUNDAY, ONSHORE FLOW
WILL SPREAD COOLING INLAND. MONDAY AND TUESDAY WILL BE DRIER
INLAND WITH NORTH FLOW ALOFT. FOR THE MIDDLE PART OF NEXT WEEK,
ANOTHER LOW PRESSURE SYSTEM FROM THE NORTH MAY MOVE SOUTHWARD
ALONG THE WEST COAST WITH A CHANCE FOR PRECIPITATION AROUND
WEDNESDAY AND THURSDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY)
THE LATEST NKX SOUNDING SHOWS A VERY DRY ATMOSPHERE BELOW 500 MB
WITH A MOIST LAYER BETWEEN 400 AND 250 MB. HIGH CLOUDS FROM A
WEAK LOW PRESSURE SYSTEM WELL OFF THE BAJA COAST WILL MOVE ACROSS
THE AREA TODAY WITH THE CLOUDS DECREASING TONIGHT.
WEAK OFFSHORE FLOW CONTINUES EARLY THIS MORNING WITH THE STRONGER
NORTHEAST TO EAST WINDS ALONG AND BELOW THE COASTAL SLOPES OF THE
MOUNTAINS MOSTLY GUSTING TO 35 MPH OR LESS. THE ATMOSPHERE JUST
ABOVE THE SURFACE IS QUITE WARM. WHERE MIXING FROM THE OFFSHORE
WINDS IS OCCURRING, TEMPERATURES ARE STILL IN THE LOWER TO MID 70S
AS OF 4:30 AM WITH RELATIVE HUMIDITY AROUND 10 TO 25 PERCENT.
HIGH TEMPERATURES FOR TODAY FOR THE COAST INTO THE WESTERN
VALLEYS WILL COOL AROUND 5 DEGREES. HIGH TEMPERATURES FOR THE
INLAND VALLEYS WILL BE AROUND 8 TO 12 DEGREES ABOVE AVERAGE WITH
HIGH TEMPERATURES IN THE LOWER 80S AND LOCALLY INTO THE MID 80S.
HIGH TEMPERATURES FOR THE COAST AND VALLEYS WILL COOL ANOTHER 5
DEGREES ON FRIDAY WITH COOLING SPREADING INTO THE MOUNTAINS AND
DESERTS ON SATURDAY. HIGH TEMPERATURES ON SATURDAY WILL STILL BE
AROUND 5 DEGREES ABOVE AVERAGE FOR INLAND AREAS WITH HIGH
TEMPERATURES RANGING FROM THE MID 60S NEAR THE COAST TO THE UPPER
60S TO MID 70S FOR THE VALLEYS WITH THE MID TO UPPER 70S FOR THE
LOWER DESERTS.
PATCHY LOW CLOUDS AND LOCALLY DENSE FOG MAY RETURN ALONG THE COAST
FOR FRIDAY NIGHT INTO SATURDAY MORNING.
LONG TERM (SUNDAY THROUGH WEDNESDAY)
A LOW PRESSURE SYSTEM FROM THE NORTH MOVING THROUGH THE PACIFIC
NORTHWEST ON SATURDAY AND INTO THE GREAT BASIN ON SUNDAY WILL
REMAIN ON A TRACK THAT IS INLAND ENOUGH TO LIMIT ENTRAINMENT OF
PACIFIC MOISTURE AND RESULTING CHANCES FOR PRECIPITATION FOR
SOUTHWESTERN CALIFORNIA. CHANCES FOR MEASURABLE PRECIPITATION
WILL REMAIN BELOW 10 PERCENT THROUGH TUESDAY.
THE COOLING TREND WILL CONTINUE THROUGH SUNDAY WITH DRIER NORTH
FLOW ON MONDAY BRINGING SLIGHT WARMING. FOR THE MIDDLE OF NEXT
WEEK, ANOTHER LOW PRESSURE SYSTEM MOVING SOUTHWARD ALONG THE WEST
COAST MAY BRING A CHANCE OF PRECIPITATION FOR SOUTHERN CALIFORNIA
FOR WEDNESDAY AND THURSDAY. THERE ARE BOTH MODEL TIMING AND TRACK
DIFFERENCES WITH THIS SYSTEM.
AVIATION
271000Z...COAST...A LITTLE HAZE WILL BE POSSIBLE AFTER 09Z FRIDAY
FOR THE SAN DIEGO COUNTY COAST. HAZE IS NOT EXPECTED TO REDUCE
VISIBILITY BELOW 5SM. OTHERWISE, VFR CONDITIONS EXPECTED THROUGH
THE TAF PERIOD.
VALLEYS/MOUNTAINS/DESERTS...VFR CONDITIONS EXPECTED THROUGH THE TAF
PERIOD. GUSTY WINDS OUT OF THE E TO NE AT 25-35 KT IN MOUNTAIN
PASSES WITH LOCALIZED WEAKER GUSTS TO 15-25 KTS STRETCHING INTO
VALLEYS BELOW MOUNTAIN PASSES THROUGH 18Z TODAY. AREAS OF LLWS/LOW-
LEVEL TURBULENCE ALONG FOOTHILLS/COASTAL MOUNTAIN SLOPES ARE
EXPECTED THROUGH LATE THIS MORNING.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH MONDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE...VILLAFANE
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