203
FXUS66 KSGX 032142
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
142 PM PST WED DEC 3 2025
SYNOPSIS
WEAK TO MODERATE SANTA ANA WINDS ARE EXPECTED THROUGH FRIDAY, WITH
THE STRONGEST WINDS EXPECTED TONIGHT INTO THURSDAY. CONDITIONS WILL
GRADUALLY WARM THURSDAY THROUGH THE MIDDLE OF NEXT WEEK. HIGH CLOUDS
WILL OCCUR INTERMITTENTLY THROUGH THE NEXT WEEK WITH LOW CLOUDS
UNLIKELY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
A 1030 MB SURFACE LOW 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
WINDS OUT OF THE NORTHEAST TO EAST WILL BECOME MORE 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.
OVERNIGHT TEMPERATURES TONIGHT WILL FALL INTO THE 30S IN WIND
SHELTERED VALLEY LOCATIONS AND IN THE HIGH DESERT. DAYTIME HIGH
TEMPERATURES WILL GRADUALLY WARM THURSDAY THROUGH THE MIDDLE OF NEXT
WEEK. HIGHS TUESDAY AND WEDNESDAY WILL BE 10 TO 18 DEGREES ABOVE
AVERAGE FOR INLAND AREAS. PERSISTENT WEAK OFFSHORE FLOW INTO NEXT
WEEK WILL KEEP LOW CLOUDS MOSTLY ABSENT FROM THE COAST. PERIODS OF
HIGH CLOUDS WILL OCCUR AT TIMES.
AVIATION
032100Z....COASTS/VALLEYS/FOOTHILLS...SCT TO BKN LOW CLOUDS HAVE
BEEN HANGING OUT ALONG THE SAN DIEGO COAST AND VALLEYS WITH BASES
AROUND 2400-5000 FT MSL. NORTH TO NORTHEAST WINDS HAVE BEEN GUSTING
20-30 KTS IN THE FOOTHILLS AND HAVE SPREAD INTO VALLEYS BELOW THE
CAJON PASS (INCLUDING 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 A
FEW TO SCT HIGH CLOUDS AROUND 20000-25000 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
SLOWLY WEAKEN TEMPORARILY AFTER 00Z THURSDAY BEFORE THEY INCREASE
AGAIN AFTER 04Z 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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