630
FXUS66 KSGX 081712
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
912 AM PST THU JAN 8 2026
SYNOPSIS
STRONG WESTERLY WINDS IN THE MOUNTAINS AND DESERTS TODAY WILL BE
FOLLOWED BY A WIND SHIFT TO NORTHERLY WINDS IN SAN BERNARDINO
COUNTY AND THE INLAND EMPIRE LATE TODAY AND TONIGHT. HIGH PRESSURE
AND SANTA ANA WINDS WILL BRING WARMER WEATHER, ESPECIALLY WEST OF
THE MOUNTAINS THROUGH THE MIDDLE OF NEXT WEEK. NORTHEAST WINDS IN
FOOTHILLS AND PARTS OF VALLEYS WILL BE STRONG AT TIMES.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
ONE LOW PRESSURE TROUGH HAS EXITED, AND THE NEXT ONE IS FLYING
INTO SOCAL FROM THE NORTHWEST TODAY. THIS WILL BOOST WESTERLY
WINDS THIS MORNING, ESPECIALLY ON DESERT SLOPES OF MOUNTAINS AND
INTO DESERTS. GUSTS 45-65 MPH ARE EXPECTED IN THESE AREAS. THIS
WIND PATTERN WILL ABRUPTLY SWITCH TO NORTHERLY WINDS AS THIS
INSIDE SLIDER SYSTEM DIVES INTO ARIZONA LATE TODAY. WITH THE
SWITCH TO OFFSHORE, SOME POPULATED ZONES WEST OF THE MOUNTAINS
WILL BECOME PART OF THE ADVISORY FOR THESE OFFSHORE SANTA ANA
WINDS. HIGH PRESSURE ALOFT WILL AMPLIFY AND STRENGTHEN ALONG THE
WEST COAST FRIDAY INTO NEXT WEEK. THIS WILL BRING A WARMING TREND,
ALTHOUGH INITIALLY FRIDAY IT WILL BE QUITE COOL. A DRY AND COLD
AIR MASS OVER THE REGION AND CLEAR SKIES WILL ALLOW FOR SOME COLD
NIGHTS IN THE SOCAL INTERIOR THROUGH SATURDAY MORNING, ESPECIALLY
WHERE WINDS CALM DOWN. WE LOSE SOME OF THE UPPER SUPPORT FOR
OFFSHORE WINDS FRIDAY AND SATURDAY, BUT THE OFFSHORE PRESSURE
GRADIENT ACTUALLY TIGHTENS THIS WEEKEND. AREAS OF STRONG NORTHEAST
WINDS WILL CONTINUE IN THE USUAL FOOTHILL AND INLAND VALLEY
AREAS, BUT ALSO AT TIMES VENTURING INTO COASTAL AREAS. THERE'S NO
END IN SIGHT FOR THIS OFFSHORE SANTA ANA PATTERN, AT LEAST FOR THE
NEXT WEEK. TEMPERATURES WILL START TO RISE INTO THE 70S AT LOWER
ELEVATIONS BY SATURDAY, AND INCREASE EACH DAY THROUGH WEDNESDAY,
WHEN UPPER 70S AND LOW 80S WILL BE COMMON. FIRE POTENTIAL WILL
RISE WITH THE WINDS AND TEMPERATURES, BUT FUEL MOISTURES REMAIN
ABOVE CRITICAL LEVELS. HOWEVER, MANY DAYS OF THIS PROLONGED
OFFSHORE FLOW WILL CERTAINLY BRING DOWN FUEL MOISTURE. SKIES WILL
REMAIN MOSTLY CLEAR FRIDAY AND BEYOND.
AVIATION
081630Z...SCT-BKN LOW CLOUDS WITH BASES AROUND 2000-3000 FT MSL AND
TOPS TO 5000-6000 FT MSL ARE MOVING THROUGH MOST OF THE COASTAL
BASIN AND INTERSECTING MOUNTAIN TERRAIN. CLOUDS SCATTER OUT SLOWLY
THROUGH 23Z FROM NORTHWEST (ORANGE COUNTY) TO SOUTHEAST (SD CO.
MTNS). VFR CONDITIONS AND CLEAR SKIES PREVAIL IN AREAS WHERE CLOUDS
SCATTER OUT.
BREEZY ONSHORE FLOW EXPECTED ACROSS THE COASTS AND VALLEYS TODAY,
WITH NORTHWEST GUSTS 20-25 KTS AND LOCALLY TO 30 KTS EXPECTED FROM
THROUGH 23Z THIS AFTERNOON. WINDS REMAIN ELEVATED IN THE INLAND
EMPIRE THIS EVENING AS WINDS SWITCH DIRECTION OUT OF THE N/NE. THESE
WINDS INCREASE AFTER 02Z FRI, ESPECIALLY SOUTH OF THE CAJON PASS AND
EVENTUALLY SPREADING THROUGH MOST OF ORANGE COUNTY BY 05Z FRI. FOR
THESE LOWLAND AREAS, PERIODS OF GUSTS 30-40 KTS ARE POSSIBLE THROUGH
FRIDAY MORNING. MOD/STG UDDFS EXPECTED FOR THE WESTERN/SOUTHERN
FOOTHILLS OF MOUNTAINS AFTER 06Z FRI.
MOUNTAINS/DESERT SLOPES WILL EXPERIENCE EVEN STRONGER GUSTS THROUGH
THE PERIOD. THROUGH 00Z FRI, WEST WINDS WITH GUSTS 40-50 KTS
EXPECTED FOR MOUNTAIN RIDGES AND EAST FACING DESERT SLOPES OF THE
PENINSULAR RANGE. AFTER 03Z FRI, NE WINDS INTENSITY AND PERIODS OF
GUSTS OF 45-55 KTS EXPECTED ALONG ALL SOUTHWEST FACING MOUNTAINS
SLOPES AND RIDGES THROUGH FRIDAY MORNING. EAST WINDS WILL ALSO
INTENSIFY TO 30-40 KTS THROUGH THE BANNING PASS AND ALONG SD CO.
MTNS AFTER 15Z FRI.
MARINE
GUSTS THIS MORNING INCREASING TO 25-30 KNOTS IN THE OUTER WATERS AND
GUSTS 20-25 KTS WITHIN 10 MILES OF THE COAST, PEAKING IN THE
AFTERNOON AND DECREASING BY 10 PM THIS EVENING.
ADDITIONALLY, COMBINED SEAS OF 8 TO 11 FEET WITH AN 8-9 SECOND
PERIOD (PROVIDING LOCALLY STEEP WAVES) WILL OCCUR TODAY IN THE OUTER
WATERS, PEAKING IN THE AFTERNOON, AND DECREASING TONIGHT. SEAS
BRIEFLY REACH 6 TO 9 FEET WITHIN 10 MILES OF THE COAST TODAY.
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH 10 PM THIS EVENING
CONTAINS MORE DETAILS. AFTER TODAY, NO HAZARDOUS MARINE CONDITIONS
EXPECTED THROUGH THIS WEEKEND.
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 SATURDAY FOR SAN BERNARDINO AND
RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE.
HIGH WIND WARNING UNTIL 1 PM PST SATURDAY FOR SAN BERNARDINO
COUNTY MOUNTAINS.
WIND ADVISORY UNTIL 1 PM PST THIS AFTERNOON FOR APPLE AND
LUCERNE VALLEYS-COACHELLA VALLEY-RIVERSIDE COUNTY MOUNTAINS-
SAN DIEGO COUNTY DESERTS-SAN DIEGO COUNTY MOUNTAINS-SAN
GORGONIO PASS NEAR BANNING.
WIND ADVISORY FROM 9 PM THIS EVENING TO 1 PM PST SATURDAY FOR
SANTA ANA MOUNTAINS AND FOOTHILLS.
WIND ADVISORY FROM 9 PM THIS EVENING TO 1 PM PST FRIDAY FOR
ORANGE COUNTY INLAND AREAS.
PZ...SMALL CRAFT ADVISORY UNTIL 10 PM PST THIS EVENING FOR COASTAL
WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER AND OUT
TO 10 NM-WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER
EXTENDING 10 TO 60 NM OUT INCLUDING SAN CLEMENTE ISLAND.
PUBLIC...MM
AVIATION/MARINE...WESTERINK
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