273
FXUS66 KSGX 031711
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
911 AM PST WED DEC 3 2025
SYNOPSIS
WEAK TO MODERATE SANTA ANA WINDS ARE EXPECTED THROUGH FRIDAY, WITH
THE STRONGEST WINDS EXPECTED TONIGHT INTO THURSDAY. TODAY WILL BE A
FEW DEGREES COOLER THAN YESTERDAY. CONDITIONS WILL GRADUALLY WARM
THURSDAY THROUGH THE MIDDLE OF NEXT WEEK. LINGERING MARINE LAYER LOW
CLOUDS WILL CLEAR THROUGH THE AFTERNOON, WITH LITTLE TO NO LOW CLOUD
COVERAGE EXPECTED THURSDAY INTO NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
VISIBLE SATELLITE WAS SHOWING PATCHY LOW CLOUDS ACROSS THE COASTAL
BASIN, WITH SOME AREAS OF HIGH CLOUDS NEAR THE COAST. THERE WERE A
FEW ISOLATED SHOWERS THIS MORNING, MAINLY NEAR THE COAST WITH
ACCUMULATIONS AROUND 0.01 INCH. DRY CONDITIONS ARE EXPECTED FOR
THE REST OF THE DAY. LOW CLOUDS WILL CLEAR THROUGH THE AFTERNOON,
WITH AREAS OF HIGH CLOUDS AT TIMES INTO NEXT WEEK. CHANCES OF LOW
CLOUDS DEVELOPING ARE LOW DUE TO A PERSISTENT WEAK OFFSHORE
PRESSURE GRADIENT INTO NEXT WEEK.
A 1030 MB SURFACE HIGH WILL DEVELOP OVER THE GREAT BASIN TODAY,
SWITCHING THE PRESSURE GRADIENT OFFSHORE AND BRINGING PERIODS OF
SANTA ANA WINDS TO THE FOOTHILLS AND COASTAL MOUNTAIN SLOPES.
GUSTY NORTH WINDS THROUGH THE CAJON PASS THIS AFTERNOON WILL
BECOME MORE NORTHEASTERLY AND WIDESPREAD TONIGHT INTO THURSDAY
MORNING. ALONG AND BELOW THE COASTAL SLOPES OF THE MOUNTAINS AND
THROUGH PASSES PEAK GUSTS OF 40 TO 50 MPH, LOCALLY UP TO 55 MPH
ARE EXPECTED. NORTHEAST TO EAST WINDS WILL CONTINUE INTO FRIDAY
MORNING, BUT WITH DECREASING COVERAGE AND STRENGTH. GUSTS ON
FRIDAY ARE EXPECTED TO PEAK AT 35 MPH. LOWEST DAYTIME HUMIDITY ON
THURSDAY AND FRIDAY FOR THE VALLEYS AND INLAND COASTAL AREAS WILL
FALL TO 15 TO 25 PERCENT.
HIGHS TODAY WILL BE A FEW DEGREES COOLER THAN TUESDAY, WITH HIGHS A
FEW DEGREES BELOW AVERAGE FOR MOST LOCATIONS. WARMER CONDITIONS ARE
EXPECTED THURSDAY, WITH FURTHER WARMING EXPECTED THROUGH THE WEEKEND
INTO THE MIDDLE OF NEXT WEEK. HIGHS TUESDAY AND WEDNESDAY WILL BE 10
TO 18 DEGREES ABOVE AVERAGE FOR INLAND AREAS.
AVIATION
031630Z....COASTS/VALLEYS/FOOTHILLS...LOW CLOUDS BASED 2500-5000 FT
MSL ARE SCATTERING OUT AND GIVING WAY TO VFR CONDITIONS THROUGH THE
REST OF THE TAF PERIOD. NORTH TO NORTHEAST WINDS GUSTING 20-30 KTS
IN THE FOOTHILLS WILL EVENTUALLY SPREAD INTO VALLEYS BELOW THE CAJON
PASS AFTER 18Z (INCLUDING VCNTY KONT). THESE WINDS WILL STRENGTHEN
TO AS HIGH AS 45 KTS IN THE FOOTHILLS AFTER 04Z THIS EVENING. AREAS
OF LLWS AND MOD UP/DOWNDRAFTS ARE EXPECTED IN LEE SIDE OF THE
MOUNTAINS. STRONG WINDS OUT OF THE NORTH TO NORTHEAST WILL CONTINUE
THROUGH THE TAF PERIOD, BEGINNING TO EASE LATE THURSDAY INTO EARLY
FRIDAY MORNING.
HIGHER MOUNTAINS/DESERTS...VFR CONDITIONS TODAY AND TONIGHT WITH FEW
TO SCT HIGH CLOUDS AROUND 20000 FT MSL. NORTH TO NORTHEAST WINDS
GUSTING 25-40 KTS THROUGH MOUNTAIN PASSES AND ALONG EAST-FACING
SLOPES IN THE SAN BERNARDO AND RIVERSIDE MOUNTAINS WILL WEAKEN
SLIGHTLY AFTER 18Z. WINDS WILL BEGIN TO INCREASE AFTER 03Z THURSDAY
TO 20-30 KTS THROUGH THE END OF THE TAF PERIOD.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED TODAY THROUGH SUNDAY.
BEACHES
VERY HIGH TIDES WILL OCCUR EACH MORNING TODAY THROUGH FRIDAY,
THREATENING COASTAL FLOODING, MINOR TIDAL OVERFLOW AND BEACH
EROSION. CHANCES OF THESE IMPACTS ARE HIGHER THIS MORNING AND
THURSDAY MORNING AS ELEVATED SURF UP TO 5-6 FEET COMBINES WITH THE
HIGH TIDES, MOSTLY IN SAN DIEGO COUNTY. 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 THROUGH FRIDAY MORNING FOR ORANGE COUNTY
COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.
PZ...NONE.
PUBLIC...CO
AVIATION/MARINE/BEACHES...VILLAFANE
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