100
FXUS66 KSGX 112115
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
115 PM 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...
..UPDATED AVIATION AND MARINE SECTIONS
ANOTHER DRY, WINDY, MOSTLY CLEAR DAY TODAY AS MODERATE TO STRONG
SANTA ANA WINDS BLOW DOWN THE FOOTHILLS INTO THE VALLEYS. PEAK
WINDS THIS MORNING HAVE BEEN 40-50 MPH DOWNWIND OF THE CAJON AND
BANNING PASSES, 40-45 MPH IN THE SANTA ANA MOUNTAIN FOOTHILLS, AND
UP TO 60-70 MPH IN THE SAN DIEGO COUNTY FOOTHILLS. GUSTS ARE
GENERALLY IN THE 30-45 MPH RANGE IN THE BREEZIER VALLEY OF SAN
DIEGO COUNTY AND THE INLAND EMPIRE, WITH GUSTS 15-30 MPH AS FAR AS
(PARTS OF) THE SAN DIEGO COAST. THESE OFFSHORE WINDS HAVE
RESULTED IN A VERY DRY AIRMASS, AND HUMIDITY VALUES IN MOST AREAS
ARE IN THE MID TEENS TO 20 PERCENTS.
WHILE OFFSHORE SANTA ANA WINDS WILL CONTINUE THROUGH THE REST OF
NEXT WEEK, THE STRONGEST PERIOD OF WINDS IS VERY LIKELY TO BE THIS
MORNING. WINDS BEGIN TO DIMINISH LATE THIS AFTERNOON AS THE UPPER
LEVEL LOW OVER CENTRAL BAJA CALIFORNIA STARTS TO MOVE EASTWARDS,
AND HIGH PRESSURE OVER THE GREAT BASIN WEAKENS. WINDS WILL STILL
BE MODERATE TO LOCALLY STRONG THROUGH MONDAY AFTERNOON, AND THE
WIND ADVISORY REMAINS IN EFFECT UNTIL MID-AFTERNOON MONDAY FOR THE
MOUNTAINS TO THE VALLEYS. WINDS CONTINUE TO WEAKEN THROUGH AT
LEAST MID-WEEK, SO THOUGH OFFSHORE WINDS WILL LINGER THEY'LL BE IN
THE WEAK TO LOCALLY MODERATE RANGE. STRONGEST WINDS WILL CONTINUE
TO BE IN THE FOOTHILLS AND PASSES.
THE WARM, DRY AIRMASS WILL REMAIN IN PLACE FROM THE CONTINUED
UPPER LEVEL RIDGE ALONG WITH THE OFFSHORE WINDS, AND EACH
AFTERNOON WILL BE SLIGHTLY WARMER THROUGH WEDNESDAY/THURSDAY NEXT
WEEK. TEMPERATURES PEAK WED-THU AT 5-10 DEGREES ABOVE AVERAGE FOR
THE COASTS AND DESERTS AND UP TO 15 DEGREES ABOVE AVERAGE FOR
MID- JANUARY IN THE VALLEYS, WHERE THE FORECAST IS FOR HIGHS 70S
INTO THE LOW 80S. THE DRY AIRMASS WILL MAKE IT DIFFICULT FOR
ANYTHING BUT INTERMITTENT MID TO UPPER LEVEL CLOUDS TO FORM
THROUGH AT LEAST MID-WEEK, AND EFFICIENT RADIATIVE COOLING EACH
NIGHT WILL LEAD TO COOLER MORNINGS THIS WEEK FOR WIND-SHELTERED
AREAS.
BY LATE NEXT WEEK (FRIDAY-SATURDAY), WHILE THERE ARE MODEL
DIFFERENCES, IT LOOKS LIKELY THAT ANOTHER WAVE WILL MOVE INTO THE
NORTHERN PLAINS/MID-WEST, WHICH COULD PROVIDE THE SUPPORT TO BUMP
UP THE OFFSHORE WINDS AGAIN. AT THE MOMENT, THE MORE LIKELY
OUTCOME IS A FAIRLY WEAK, BRIEF INCREASE IN WINDS LATE FRIDAY
INTO SATURDAY, BUT NOT TO THE STRENGTH OF TODAY'S WINDS. IN ANY
CASE, WARM, DRY, AND MOSTLY CLEAR WEATHER IS VERY LIKELY TO
CONTINUE THROUGH LATE NEXT WEEK.
AVIATION
112130Z...COAST/VALLEYS/MOUNTAINS...MOSTLY CLEAR SKIES PREVAILING.
NORTHEAST AND EAST WINDS EASING SLIGHTLY THIS AFTERNOON AND EVENING
WITH GUSTS NEAR 30-40 KTS ALONG COASTAL SLOPES AND 25-35 KTS
DOWNWIND OF THE CAJON/BANNING PASSES INTO THE INLAND EMPIRE AND
PARTS OF INLAND ORANGE COUNTY/EASTERN SAN DIEGO VALLEYS. WEAKER
WINDS EXPECTED BY MONDAY AFTERNOON WITH THE STRONGEST GUSTS MORE
CONFINED TO THE MOUNTAIN SLOPES NEAR 25-35 KTS.
PERIODS OF LLWS WITH MOD UP/DOWNDRAFTS DOWNWIND OF COASTAL SLOPES,
NOTABLY BETWEEN 06-15Z MON WHEN STRONG WINDS ARE MORE LIKELY TO
SEPARATE FROM THE SURFACE. OFFSHORE WIND PATTERN CONTINUES THROUGH
THE NEXT FEW DAYS, THOUGH WEAKER AND MORE LOCALIZED.
DESERTS...VFR CONDITIONS THROUGH SUNDAY EVENING. ELEVATED NORTHEAST
WINDS STAYING MOSTLY CONFINED TO DESERT FOOTHILLS WITH GUSTS UP TO
20 KTS.
MARINE
LOCALIZED EASTERLY WIND GUSTS NEAR 20 KNOTS SPORADICALLY THROUGH
MONDAY MORNING. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS EXPECTED
THROUGH FRIDAY.
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 COUNTY
MOUNTAINS-SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE
INLAND EMPIRE-SAN DIEGO COUNTY MOUNTAINS-SAN DIEGO COUNTY
VALLEYS-SAN GORGONIO PASS NEAR BANNING-SANTA ANA MOUNTAINS
AND FOOTHILLS.
PZ...NONE.
PUBLIC...CSP
AVIATION/MARINE...APR
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