006
FXUS66 KSGX 091725
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
925 AM PST FRI JAN 9 2026
SYNOPSIS
MODERATE TO LOCALLY STRONG SANTA ANA WINDS WILL CONTINUE ALONG
THE COASTAL MOUNTAIN SLOPES, FOOTHILLS, AND INTO THE VALLEYS
THROUGH SUNDAY. PERIODS OF WEAKER SANTA ANA WINDS WILL CONTINUE
BEYOND THAT. PATCHY FROST IS EXPECTED THIS MORNING IN WIND
SHELTERED VALLEY LOCATIONS. A WARMING TREND DEVELOPS THIS WEEKEND,
WITH TEMPERATURES PEAKING AROUND THE MIDDLE OF NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION AND MARINE SECTIONS
THE OFFSHORE FLOW AND SANTA ANA WINDS HAVE BEGUN IN EARNEST, WITH
SOME FOOTHILL SPOTS GUSTING OVER 50 MPH, AND EVEN SOME VALLEY
LOCATIONS GUSTING OVER 30 MPH. THESE WINDS WILL MOST LIKELY PEAK
TODAY IN THE LATE MORNING THROUGH EARLY AFTERNOON. TOP GUSTS IN
THE TOP SPOTS WILL ACHIEVE 60+ MPH WITH REALLY ISOLATED GUSTS
CLOSE TO 80 MPH. WINDS CONTINUE QUITE RELENTLESS IN THESE AREAS
THROUGH THE WEEKEND, ONLY SLIGHTLY WEAKER AND SLIGHTLY LESS
WIDESPREAD THAN TODAY'S WINDS. YESTERDAY'S COLD SYSTEM THAT DOVE
INTO ARIZONA HAS SET UP EFFICIENT OFFSHORE FLOW BOTH ALOFT AND AT
THE SURFACE. WHILE THE UPPER SUPPORT WEAKENS SLIGHTLY, THE SURFACE
GRADIENT TIGHTENS SLIGHTLY, SO NEARLY A WASH AS FAR AS THE WIND
TRENDS GO. FIRE POTENTIAL RISES AS HUMIDITY DIPS DURING THIS WINDY
EVENT, BUT THE FUEL MOISTURES REMAIN QUITE HIGH (GREEN AND
GROWING VEGETATION FROM RECENT RAINS) TO THANKFULLY MITIGATE THE
FIRE POTENTIAL. THERE ARE SOME FROSTY CONDITIONS IN PARTS OF THE
INLAND WIND-SHELTERED VALLEYS THIS MORNING.
AN UPPER RIDGE OF HIGH PRESSURE BUILDS OVER CALIFORNIA THIS
WEEKEND AND CONTINUES TO EXPAND AND STRENGTHEN NEXT WEEK. BUT WITH
LOW PRESSURE OVER NORTHWEST MEXICO, THE FLOW ALOFT CONTINUES TO
BE OFFSHORE (NORTHEAST). SURFACE GRADIENTS WEAKEN SO WINDS SHOULD
ALSO WEAKEN A LITTLE, BUT AREAS OF GUSTY WINDS WILL PERSIST. IT'S
GOING TO BE A REALLY LONG SANTA ANA EPISODE. A STEADY WARMING
TREND WILL BOOST TEMPERATURES A COUPLE DEGREES EACH DAY INTO
WEDNESDAY. LOOK FOR LOTS OF 70S EMERGING AT LOWER ELEVATIONS THIS
WEEKEND. BY WEDNESDAY THERE SHOULD BE SOME AREAS REACHING INTO THE
80S. THE DRY AIR MASS WILL ALLOW TEMPS TO DROP EFFICIENTLY EACH
NIGHT, ESPECIALLY WHEN/WHERE WINDS CALM DOWN, BUT NIGHTTIME TEMPS
WILL REMAIN REALLY MILD IN THE 60S IN THOSE AREAS WHERE MIXING
WINDS PERSIST. NO MEANINGFUL CHANGE IN THE PATTERN IS SHOWN BY
ENSEMBLES TOWARD NEXT WEEKEND. SOME SOLUTIONS SHOW AN ARCTIC BLAST
COMING DOWN THE INTERIOR WEST. OTHERS KEEP THE RIDGE FIRMLY IN
PLACE ALONG THE WEST COAST. CONFIDENCE IS HIGH OUR WEATHER WILL
REMAIN DRY AND WARM INTO NEXT WEEKEND.
AVIATION
091615Z...COAST/VALLEYS/MOUNTAINS...SCT CLOUDS AOA 20K FT MSL.
NORTHEAST WINDS CURRENTLY GUSTING 40-55 KTS ALONG COASTAL SLOPES
MOSTLY NORTH OF SAN DIEGO COUNTY. GUSTS 25-40 KTS THROUGH THE INLAND
EMPIRE FROM KONT TO KRIV, AND INTO INLAND ORANGE COUNTY (INCLUDING
KSNA). STRONGEST WINDS OCCURRING BEFORE 20Z FRI. WINDS TURNING MORE
EASTERLY 21Z FRI-03Z SAT, EXPANDING IN COVERAGE IN MORE OF SAN DIEGO
COUNTY AND MORE OF THE INLAND VALLEYS. PERIODS OF LLWS AND MODERATE
UP AND DOWNDRAFTS DOWNWIND OF COASTAL SLOPES (I.E. KONT, KSNA,
KSBD). WIND PATTERN CONTINUES THROUGH MUCH OF SATURDAY.
DESERTS...VFR CONDITIONS THROUGH THE PERIOD. STRONG NORTHEAST WIND
GUSTS STAYING MOSTLY CONFINED TO MOUNTAIN SLOPES, WITH WINDS
GENERALLY BELOW 20 KTS.
MARINE
NORTHEAST TO EAST WINDS WILL OCCASIONALLY GUST TO 20 KNOTS THIS
WEEKEND. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH
TUESDAY NIGHT.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY UNTIL 1 PM PST SUNDAY FOR RIVERSIDE 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.
HIGH WIND WARNING UNTIL 1 PM PST SUNDAY FOR SAN BERNARDINO
COUNTY MOUNTAINS.
WIND ADVISORY UNTIL 1 PM PST SATURDAY FOR ORANGE COUNTY INLAND
AREAS.
PZ...NONE.
PUBLIC...APR
AVIATION/MARINE...MM
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