258
FXUS66 KSGX 111027
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
227 AM PST SUN JAN 11 2026
SYNOPSIS
MODERATE TO LOCALLY STRONG SANTA ANA WINDS WILL CONTINUE ALONG
THE COASTAL MOUNTAIN SLOPES, FOOTHILLS, AND INTO THE VALLEYS
THROUGH MONDAY. PERIODS OF WEAKER SANTA ANA WINDS WILL CONTINUE
THROUGH THE REMAINDER OF THE WEEK. A WARMING TREND CONTINUES,
WITH TEMPERATURES PEAKING AROUND THE MIDDLE OF THE WEEK.
WEDNESDAY AND THURSDAY WILL LIKELY BE THE WARMEST DAYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS MORNING...SANTA ANA WINDS AND LOW HUMIDITY CONTINUE. SURFACE
PRESSURE GRADIENTS REMAIN STRONGLY OFFSHORE, WITH -11.2 MB SAN-TPH
BUT THE UPPER LEVEL SUPPORT HAS WEAKENED. IN THE LAST HOUR,
SEVERAL LOCATIONS IN THE SAN BERNARDINO AND SAN DIEGO COUNTY
MOUNTAINS HAVE REPORTED NORTHEAST TO EAST WINDS GUSTING 60-70
MPH. MANY OTHER LOCATIONS IN THE MTNS AND INLAND VALLEYS (NEAR THE
FOOTHILLS) HAVE REPORTED WIND GUSTS OF 45 MPH OR GREATER.
WINDS WILL GRADUALLY WEAKEN AND BECOME LESS WIDESPREAD THROUGH THE
WEEK AS SFC PRESSURE GRADIENTS AND UPPER LEVEL SUPPORT WEAKEN,
HOWEVER WINDS WILL LIKELY REMAIN STRONG ENOUGH TO MEET WIND
ADVISORY THRESHOLDS THROUGH MONDAY MORNING. THE PERSISTENT DRY
CONDITIONS WITH OFFSHORE WINDS WILL MAKE IT UNLIKELY THAT ANY
MARINE LAYER MOISTURE/CLOUDS WOULD RETURN ANY TIME THIS WEEK.
THE EXTENSIVE RIDGE OF HIGH PRESSURE AND OFFSHORE FLOW WILL
CONTINUE THE WARMING TREND WHICH WILL PEAK ON WEDNESDAY. THIS
WILL LIKELY BE THE WARMEST DAY WITH DAYTIME TEMPERATURES REACHING
THE LOW 80S IN SOME INLAND VALLEY AREAS. IN THE COASTAL AREAS AND
DESERTS, TEMPS WILL BE 5-10 DEGREES ABOVE SEASONAL AVERAGES AND IN
THE INLAND VALLEYS, TEMPS WILL BE AS MUCH AS 15 DEGREES ABOVE
AVERAGES. THE DRY CONDITIONS WILL ALLOW FOR EFFICIENT RADIATION
COOLING AT NIGHT AND AS THE SANTA ANA WINDS BECOME WEAKER AND
LESS WIDESPREAD, MORE LOCATIONS IN THE INLAND VALLEYS WILL BECOME
WIND-SHELTERED ALLOWING OVERNIGHT TEMPS TO LOWER INTO THE LOW 30S
OR HIGH 20S.
AFTER WED, FORECAST DETAILS BECOME MORE UNCERTAIN AS MODEL
SOLUTIONS DIVERGE BUT THERE IS REASONABLE CONFIDENCE THAT SOCAL
WILL REMAIN DRY AND WARM WITH PERIODS OF SANTA ANA WINDS INTO NEXT
WEEKEND.
AVIATION
110930Z...COAST/VALLEYS/MOUNTAINS...CLEAR SKIES PREVAILING.
NORTHEAST AND EAST WINDS GUSTING GENERALLY 30-45 KTS ALONG COASTAL
SLOPES WITH 25-40 KTS DOWNWIND OF THE CAJON/BANNING PASSES INTO THE
INLAND EMPIRE AND PARTS OF INLAND ORANGE COUNTY/EASTERN SAN DIEGO
VALLEYS. PERIODS OF LLWS WITH MOD UP/DOWNDRAFTS DOWNWIND OF COASTAL
SLOPES, ESPECIALLY AT NIGHT WHEN STRONG WINDS ARE MORE LIKELY TO
SEPARATE FROM THE SURFACE. OFFSHORE WIND PATTERN CONTINUES THROUGH
THE REMAINDER OF THE WEEKEND. SLIGHTLY WEAKER WINDS BY MONDAY
AFTERNOON WITH THE STRONGEST GUSTS MORE CONFINED TO THE MOUNTAIN
SLOPES.
DESERTS...VFR CONDITIONS THROUGH SUNDAY EVENING. ELEVATED NORTHEAST
WINDS STAYING MOSTLY CONFINED TO DESERT FOOTHILLS WITH GUSTS 15-25
KTS.
MARINE
LOCALIZED EASTERLY WIND GUSTS NEAR 20 TO 25 KNOTS SPORADICALLY
THROUGH MONDAY MORNING. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS
EXPECTED THROUGH THURSDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY UNTIL 2 PM PST MONDAY FOR ORANGE COUNTY INLAND
AREAS-RIVERSIDE COUNTY MOUNTAINS-SAN BERNARDINO AND
RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN DIEGO COUNTY
VALLEYS-SANTA ANA MOUNTAINS AND FOOTHILLS.
HIGH WIND WARNING UNTIL 1 PM PST THIS AFTERNOON FOR SAN
BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS-SAN
GORGONIO PASS NEAR BANNING.
WIND ADVISORY FROM 1 PM THIS AFTERNOON TO 2 PM PST MONDAY FOR
SAN BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS-
SAN GORGONIO PASS NEAR BANNING.
PZ...NONE.
PUBLIC...PG
AVIATION/MARINE...KW
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