507
FXUS66 KSGX 140432
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
832 PM PST TUE JAN 13 2026
SYNOPSIS
PERIODS OF GUSTY SANTA ANA WINDS WILL CONTINUE INTO THURSDAY WITH
WARMER CONDITIONS THROUGH WEDNESDAY. FOR THURSDAY THROUGH
SATURDAY, THERE WILL BE SLIGHT DAY TO DAY DIFFERENCES IN HIGH
TEMPERATURES FOLLOWED BY A COOLING TREND FOR SUNDAY INTO THE
MIDDLE OF NEXT WEEK. NIGHT AND MORNING COASTAL LOW CLOUDS AND FOG
COULD RETURN AS SOON AS LATE THURSDAY NIGHT.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THIS EVENING, OFFSHORE FLOW CONTINUES WITH SFC PRESSURE GRADIENTS
STILL -11.9 SAN-TPH AND -3.5 SAN-DAG. IN THE LAST HOUR, THE
STRONGEST WIND GUSTS REPORTED IN THE WIND-PRONE LOCATIONS WERE
45-55 MPH...NOTICEABLY WEAKER THAN AT THIS TIME YESTERDAY. HIGH
TEMPERATURES THIS AFTERNOON WERE GENERALLY A FEW TO AS MUCH AS 10
DEGREES WARMER THAN YESTERDAY IN THE INLAND VALLEYS AND LOWER
DESERTS.
FROM PREVIOUS DISCUSSION...
STRONG AND GUSTY SANTA ANA WINDS WILL CONTINUE THIS EVENING,
ESPECIALLY FOR THE FAVORED AREAS. THE STRONGEST GUSTS WILL LIKELY
BE FELT IN VICINITY OF CAJON PASS AND ALSO ACROSS THE TECATE
DIVIDE IN SAN DIEGO COUNTY (EAST OF PINE VALLEY TO JACUMBA), WHERE
THERE COULD BE WINDS OCCASIONALLY GUSTING TO 55 MPH. THESE WINDS
WILL WEAKEN FURTHER LATER THIS EVENING AND OVERNIGHT. THE CLEAR
SKIES WILL ALLOW FOR SOME OF THE WIND-SHELTERED VALLEYS TO GET
QUITE COLD, AND EVEN A FEW AREAS COULD POTENTIALLY SEE FROST
IN SOME OF THE HIGHER INLAND VALLEYS. WINDS WILL BEGIN TO
STRENGTHEN AGAIN TOMORROW DURING THE DAY, ALTHOUGH LIKELY NOT BE
AS STRONG AS TODAY. WHERE THERE WILL STILL BE WINDS, TEMPERATURES
WILL BE RELATIVELY WARMER. THE OFFSHORE WINDS WILL KEEP THE SKIES
MOSTLY CLEAR THROUGH AT LEAST TOMORROW EXCEPT FOR SOME HIGH CLOUDS.
TEMPERATURES WILL ALSO CONTINUE TO RISE, WITH THE WARMEST DAY
BEING TOMORROW WHEN HIGH TEMPS WILL REACH ABOUT 10 TO 15 DEGREES
ABOVE THE SEASONAL AVERAGE, WITH MID 80S FOR THE INLAND AREAS.
THURSDAY THROUGH MONDAY...
MILD TO MODERATE SANTA ANA CONDITIONS CONTINUE TO IMPACT THE
REGION WITH A SLIGHT UPTICK IN WIND STRENGTH ON THURSDAY,
ALTHOUGH THESE WILL CONTINUE TO WEAKEN GRADUALLY BY FRIDAY AND
INTO THE WEEKEND AS THE PRESSURE GRADIENT WEAKENS WITH THE RIDGE
EXPANDING NORTHWESTWARD. AS THIS OCCURS, THE RIDGE AXIS WILL
BECOME MORE ELONGATED AND NEGATIVELY TILTED, WHICH WILL ACT AS A
BLOCKING PATTERN AND KEEP THE DRY CONDITIONS PERSISTING THROUGH
THE BEGINNING OF NEXT WEEK, WITH ONLY A GRADUAL COOLDOWN AS SOME
TROUGHING TO THE EAST OVER CENTRAL CONUS DOES HELP TO INFLUENCE
THE REGION WITH COOLER AIR FROM THE NORTH, ALTHOUGH WITH THE
RIDGE STILL IN CONTROL, ALONG WITH WEAK DOWNSLOPING WINDS,
TEMPERATURES WILL REMAIN ABOVE AVERAGE. THE OFFSHORE WINDS WILL
PREDOMINANTLY KEEP ANY DEVELOPMENT OF THE MARINE LAYER MOSTLY
CONFINED OVER THE COASTAL WATERS, ALTHOUGH THERE COULD BE A RETURN
OF SOME FOG/LOW CLOUDS MOVING IN OVER PORTIONS OF THE COAST AND
INLAND AREAS OF SAN DIEGO AND ORANGE COUNTIES BEGINNING THURSDAY
NIGHT INTO FRIDAY MORNING. THE DEVELOPMENT OF THE MARINE LAYER
WILL CONTINUE TO BECOME MORE PREVALENT GOING INTO THE WEEKEND AND
INTO EARLY NEXT WEEK. LOOKING BEYOND THE FORECAST, ENSEMBLES ARE
HINTING AT THE POSSIBILITY OF A RETURN OF PRECIPITATION TOWARDS
THE MID PART TO END OF NEXT WEEK.
AVIATION...140400Z
MOSTLY CLEAR SKIES AND VFR CONDITIONS THROUGH
WEDNESDAY EVENING. EAST TO NORTHEAST WINDS 20-30 KTS WITH ISOLATED
GUSTS TO 40 KTS FOR COASTAL SLOPES AND FOOTHILLS. LOCALIZED GUSTS 15-
25 KTS INTO THE VALLEYS AFTER 18Z WED. MOD UP/DOWNDRAFTS IN LEE OF
MOUNTAINS. LOCALIZED LLWS WED MORNING, BUT UNLIKELY FOR ANY TAF SITE.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SUNDAY.
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...STEWEY/PG
AVIATION/MARINE...KW
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page