725
FXUS66 KSGX 051247 CCA
AFDSGX
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
429 AM PST FRI DEC 5 2025
SYNOPSIS
WEAK SANTA ANA WINDS WILL CONTINUE ACROSS THE MOUNTAINS AND
FOOTHILLS TODAY, FOLLOWED BY WEAK ONSHORE FLOW ON SATURDAY. FOG,
POTENTIALLY DENSE, COULD RETURN TO THE COASTAL AREAS SUNDAY AND
MONDAY MORNINGS. GRADUAL WARMING THROUGH THE MIDDLE OF NEXT WEEK
AND LITTLE CHANGE THROUGH THE END OF THE WEEK WITH HIGH
TEMPERATURES AS MUCH AS 10-15 DEGREES ABOVE NORMAL AND PERIODS OF
WEAK TO LOCALLY MODERATE SANTA ANA WINDS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SKIES ARE CLEAR THIS MORNING WITH ANY NOTABLE SANTA ANA WINDS
CONFINED TO THE CAJON PASS, WHERE GUSTS ARE CURRENTLY AROUND 25-35
MPH. WEAK SANTA ANA WINDS WILL CONTINUE THROUGH THE MORNING, THEN
GRADIENTS AND WINDS WEAKEN THROUGH THE AFTERNOON. AN UPPER LEVEL EAST-
WEST RIDGE AXIS ASSOCIATED WITH THE HIGH OVER THE EAST PACIFIC
BEGINS TO NUDGE INTO SO CAL TODAY BRINGING WARMING ACROSS THE
REGION. HIGHS WILL GENERALLY BE IN THE UPPER 60S TO LOW 70S ACROSS
THE COASTAL AREAS, VALLEYS, AND LOW DESERTS, LOW 60S IN THE HIGH
DESERTS, AND 50S IN THE MOUNTAINS - AROUND 2 TO 4 DEGREES ABOVE
NORMAL.
PRESSURE GRADIENTS BECOME NEUTRAL TO THE EAST AND VERY WEAKLY
OFFSHORE TO THE NORTH ON SATURDAY, ALLOWING A RETURN OF A MORE
PROMINENT SEA BREEZE IN THE AFTERNOON. THIS WON'T DO ANYTHING IN
TERMS OF MODERATING TEMPERATURES WITH THE UPPER RIDGE CONTINUING
TO NUDGE IN FROM THE WEST, BUT IT COULD LEAD TO THE REDEVELOPMENT
OF FOG, FIRST OVER THE COASTAL WATERS DURING THE AFTERNOON
SATURDAY, THEN SPREADING INTO THE COASTAL AREAS SATURDAY NIGHT.
WEAK OFFSHORE FLOW DEVELOPS AGAIN BY SUNDAY MORNING AS SURFACE
HIGH PRESSURE DEVELOPS OVER THE EASTERN GREAT BASIN AND ROCKIES,
WHICH COULD HELP PUSH THE FOG BACK OUT TO SEA RELATIVELY EARLY IN
THE MORNING. WINDS WEAKEN AGAIN SUNDAY AFTERNOON WITH ANOTHER
NIGHT OF POTENTIAL FOG AT THE COAST BEFORE OFFSHORE FLOW RETURNS
AGAIN MONDAY MORNING. OTHERWISE WARMER ON SUNDAY WITH HIGHS AROUND
5-10 DEGREES ABOVE NORMAL.
THE REMAINDER OF NEXT WEEK WILL BE DECIDEDLY WARM AND DRY WITH
PERIODS OF WEAK TO LOCALLY MODERATE SANTA ANA WINDS. WHILE THERE
IS HIGH CERTAINTY IN THE OVERALL UPPER LEVEL PATTERN WITH THE
RIDGE SLOWLY SHIFTING EAST, BECOMING DIRECTLY OVERHEAD AROUND
THU/FRI, ENSEMBLES HAVE A BIT OF SPREAD IN THE AMPLITUDE OF THE
RIDGE. THIS WILL AFFECT THE TRACK OF ANY SHORT WAVES TO OUR NORTH
AND THE SUBSEQUENT SURFACE HIGH PRESSURE AND SANTA ANA WIND
STRENGTH BEHIND THEM, AS WELL AS TEMPERATURES. CURRENT FORECAST
HAS TEMPERATURES PEAKING AT AROUND 10-15 DEGREES ABOVE NORMAL
TUESDAY THROUGH FRIDAY, REACHING THE LOW 80S IN THE VALLEYS AND
LOW DESERTS. THE CW3E WEST-WRF ENSEMBLE SHOWS SANTA ANA WINDS
PEAKING MONDAY AND TUESDAY WHEN THERE IS AROUND A 65% CHANCE OF A
WEAK-TO-MODERATE EVENT, LOWERING TO AROUND A 40% CHANCE ON
WEDNESDAY. THIS TRANSLATES TO GUSTS AROUND 30-45 MPH IN THE WIND
PRONE PASSES, CANYONS, AND FOOTHILLS, LOCALLY AROUND 50 MPH IN THE
FAVORED SPOTS. ENSEMBLES ARE STARTING TO HINT AT THE EAST PAC
RIDGE BREAKING DOWN AND PRECIPITATION RETURNING AROUND THE MIDDLE
OF THE MONTH, BUT WE'LL HAVE TO SEE HOW WELL THAT HOLDS UP.
AVIATION
051030Z....MOSTLY CLEAR SKIES AND VFR CONDITIONS ARE EXPECTED TODAY
AND TONIGHT.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY.
BEACHES
A VERY HIGH TIDE THIS MORNING WILL THREATEN COASTAL FLOODING, MINOR
TIDAL OVERFLOW AND BEACH EROSION. CHECK THE COASTAL HAZARD MESSAGE
FOR DETAILS.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...BEACH HAZARDS STATEMENT UNTIL 10 AM PST THIS MORNING FOR ORANGE
COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
PZ...NONE.
PUBLIC...SS
AVIATION/MARINE/BEACHES...MM
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