973
FXUS66 KSGX 082144
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
144 PM PST THU JAN 8 2026
SYNOPSIS
GUSTY WESTERLY WINDS WILL WILL QUICKLY BECOME NORTHERLY FROM NORTH
TO SOUTH INTO FRIDAY. THIS WILL BRING A PERIOD OF MODERATE TO
LOCALLY STRONG SANTA ANA WINDS TO THE COASTAL MOUNTAIN SLOPES,
FOOTHILLS, AND INTO THE VALLEYS THAT WILL LAST THROUGH SUNDAY.
PERIODS OF SANTA ANA WINDS WILL CONTINUE INTO NEXT WEEK, BUT ARE
EXPECTED TO BE WEAKER. AREAS OF FROST ARE POSSIBLE IN WIND SHELTERED
VALLEY LOCATIONS IN SAN DIEGO COUNTY AND THE EASTERN INLAND EMPIRE
TONIGHT INTO EARLY FRIDAY MORNING. WARM DAYS WEST OF THE MOUNTAINS
CAN BE EXPECTED FRIDAY INTO EARLY NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
KEY POINTS:
*MODERATE TO LOCALLY STRONG SANTA ANA WINDS ARE EXPECTED TONIGHT
INTO FRIDAY FOR PORTIONS OF ORANGE COUNTY, INLAND EMPIRE, AND
COASTAL SLOPES OF THE SAN BERNARDINO COUNTY MOUNTAINS, EXPANDING TO
SAN DIEGO COUNTY VALLEYS AND COASTAL MOUNTAIN SLOPES FRIDAY.
*SANTA ANA WINDS WILL CONTINUE ACROSS ALL VALLEYS, FOOTHILLS, AND
COASTAL MOUNTAIN SLOPES INTO NEXT WEEK. WINDS FOR THE FIRST HALF OF
NEXT WEEK LOOK WEAKER THAN THE WEEKEND, WITH LOWER CONFIDENCE IN
WINDS FOR THE SECOND HALF OF THE WEEK.
*COLD MORNINGS AND AREAS OF FROST ARE EXPECTED FRIDAY THROUGH SUNDAY
FOR THE DESERTS, MOUNTAINS, AND WIND SHELTERED VALLEYS.
WESTERLY WINDS HAVE BEGUN TO WEAKEN AS OF 1 PM AND NORTHERLY WINDS
HAVE BEGUN TO DEVELOP ON THE COASTAL SLOPES OF THE SAN BERNARDINO
COUNTY MOUNTAINS. A PEAK WIND GUST REPORT FOR THE WESTERLY WINDS IS
HEADLINED ON OUR WEATHER.GOV/SANDIEGO HOMEPAGE. PEAK WEST GUSTS
OVERNIGHT AND THIS MORNING WERE MAINLY IN THE 50 TO 65 MPH RANGE.
BREEZY WESTERLY WINDS WERE OBSERVED IN THE COASTAL BASIN AS WELL
WITH WITH GUSTS MAINLY IN THE 15 TO 20 MPH RANGE. WEST WINDS IN
RIVERSIDE AND SAN DIEGO COUNTIES WILL DIMINISH THIS
AFTERNOON/EVENING AND MORE WIDESPREAD OFFSHORE WINDS WILL DEVELOP AS
AN INSIDE SLIDER CONTINUES TO DIG SOUTH AND EAST INTO ARIZONA
TONIGHT.
NORTHERLY WINDS ARE EXPECTED TO PEAK IN STRENGTH TONIGHT INTO FRIDAY
MORNING FOR PORTIONS OF THE INLAND EMPIRE, FOOTHILLS OF THE SANTA
ANA AND SAN BERNARDINO MOUNTAINS, AND PORTIONS OF INLAND ORANGE
COUNTY. THERE COULD BE IMPACTS TO TRAVEL DUE TO STRONG CROSS-WINDS
BELOW THE CAJON PASS AND HIGH PROFILE VEHICLES SHOULD DRIVE WITH
CAUTION THURSDAY NIGHT INTO FRIDAY MORNING. ADDITIONALLY, DUE TO THE
RECENT RAINS THE SATURATED SOIL MAY MAKE TREES MORE VULNERABLE TO
UPROOTING (ESPECIALLY ON THE COASTAL SLOPES OF THE SAN BERNARDINO
MOUNTAINS). PEAK WIND GUSTS FOR PORTIONS OF INLAND ORANGE COUNTY AND
THE INLAND EMPIRE WILL BE 35-45 MPH, GUSTS MAY BE LOCALLY TO 50 MPH
BELOW THE CAJON PASS. GUSTS ON THE COASTAL SLOPES OF THE SAN
BERNARDINO AND SANTA ANA MOUNTAINS OF 45-65 MPH, LOCALLY HIGHER IN
WIND PRONE LOCATIONS NEAR THE CAJON PASS.
WINDS WILL BECOME MORE NORTHEAST TO EAST FRIDAY THROUGH THE WEEKEND
AS THE MAIN DRIVER OF THE SANTA ANAS BECOMES THE PRESSURE GRADIENT
BETWEEN SOUTHERN CALIFORNIA AND THE INTERMOUNTAIN WEST. THIS WILL
SPREAD MODERATE STRENGTH NORTHEAST TO EAST SANTA ANA WINDS TO THE
SAN DIEGO MOUNTAIN FOOTHILLS, LOCALLY INTO THE VALLEYS. AS THE WINDS
BECOME MORE NORTHEAST TO EAST IN DIRECTION, WINDS PREVIOUSLY
MENTIONED IN PLACES NORTH OF SAN DIEGO COUNTY WILL WEAKEN, BUT
REMAIN ELEVATED. OVERALL PEAK GUSTS OF 35-55 MPH, LOCALLY UP TO 65
MPH, ARE EXPECTED FRIDAY AFTERNOON THROUGH SUNDAY FROM THE VALLEYS
TO THE COASTAL MOUNTAIN SLOPES. THE STRONGEST WINDS WILL OCCUR ON
THE COASTAL SLOPES OF THE MOUNTAINS INTO THE FOOTHILLS AND BELOW
PASSES. PERIODS OF SANTA ANA WINDS ARE EXPECTED TO CONTINUE INTO
NEXT WEEK BUT CURRENT GUIDANCE IS INDICATING WINDS WILL BE WEAKER
FOR THE FIRST HALF OF THE WEEK. THERE REMAINS UNCERTAINTY IN THE
WIND SPEEDS FOR THE SECOND HALF.
A VERY COLD AIRMASS WILL BE TRANSPORTED INTO OUR AREA DESERTS,
MOUNTAINS, AND WIND SHELTERED VALLEYS. COLDEST CONDITIONS ARE
EXPECTED TONIGHT INTO FRIDAY MORNING FOR AREAS WEST OF THE
MOUNTAINS, WITH COLD CONDITIONS FOR THE DESERTS AND MOUNTAINS
CONTINUING INTO THE WEEKEND. FROST IS POSSIBLE IN WIND SHELTERED
VALLEY LOCATIONS OVERNIGHT TONIGHT, MOST LIKELY IN THE INLAND EMPIRE
SOUTH OF I-10 AND EAST OF I-215 AND EAST OF I-15 IN SAN DIEGO
COUNTY. ALTHOUGH NIGHTS WILL BE CHILLY FOR THE NEXT FEW DAYS, A
GRADUAL WARMING TREND IS EXPECTED THROUGH NEXT WEEK. BY EARLY NEXT
WEEK, HIGHS WEST OF THE MOUNTAINS WILL REACH THE MID TO UPPER 70S,
WITH HIGHS REACHING THE 80S FOR SOME LOCATIONS BY THE END OF THE
WEEK. FROM FRIDAY ONWARD, MARINE LAYER LOW CLOUDS AND FOG ARE
EXPECTED TO BE ABSENT FROM COASTAL AREAS DUE TO THE DOMINATE
OFFSHORE FLOW.
AVIATION
082100Z...SCT CLOUDS WITH BASES AROUND 3500-4500 FT MSL ARE MOVING
THROUGH INLAND SD COUNTY AND INTERSECTING WITH THE MOUNTAIN RIDGES.
CLOUDS CONTINUE TO SCATTER OUT TO THE MOUNTAINS THROUGH 23Z. VFR
CONDITIONS AND CLEARING SKIES THROUGHOUT THE LOWLANDS AND VFR
REGION-WIDE BY 02Z FRI.
GUSTY NW WINDS GUSTING TO 25-35 KTS ALONG NORTHEASTERN PORTIONS OF
THE INLAND EMPIRE TO SPREAD TO AREAS SOUTH OF THE CAJON PASS AFTER
02Z FRI AND THROUGH MOST OF ORANGE COUNTY BY 05Z TONIGHT AS WINDS
TURN OUT OF THE N/NE. FOR THESE LOWLAND AREAS, PERIODS OF GUSTS 30-
40 KTS (LOCALLY HIGHER) ARE POSSIBLE THROUGH FRIDAY AFTERNOON.
MOD/STG UDDFS EXPECTED FOR THE WESTERN/SOUTHERN FOOTHILLS OF
MOUNTAINS AND PASSES.
IN THE MOUNTAINS, 25-40 KT GUSTS OVER THE PENINSULAR RANGE WEAKEN
THIS EVENING, THEN NE WINDS INTENSIFY AFTER 03Z AND PERIODS OF GUSTS
OF 45-55 KTS EXPECTED ALONG ALL SOUTHWEST FACING MOUNTAINS SLOPES
AND RIDGES THROUGH EARLY FRIDAY AFTERNOON. EAST WINDS WILL ALSO
INTENSIFY TO 35-45 KTS THROUGH THE BANNING PASS AND ALONG SD CO.
MTNS AFTER 15Z FRI.
MARINE
GUSTS 25-30 KNOTS IN THE OUTER WATERS AND GUSTS 20-25 KTS WITHIN 10
MILES OF THE COAST PEAK THIS AFTERNOON AND DECREASE BY 10 PM THIS
EVENING.
ADDITIONALLY, COMBINED SEAS OF 9 TO 13 FEET WITH AN 8-9 SECOND
PERIOD (PROVIDING LOCALLY STEEP WAVES) WILL OCCUR TODAY IN THE OUTER
WATERS, PEAKING THIS AFTERNOON, AND DECREASING TONIGHT. STEEP SEAS
OF 6 TO 9 FEET ARE ALSO OCCURRING WITHIN 10 MILES OF THE COAST TODAY
AND COME DOWN TONIGHT.
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 SUNDAY FOR RIVERSIDE COUNTY
MOUNTAINS-SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE
INLAND EMPIRE-SAN DIEGO COUNTY MOUNTAINS-SAN GORGONIO PASS
NEAR BANNING.
WIND ADVISORY FROM 8 AM FRIDAY TO 1 PM PST SUNDAY FOR SAN DIEGO
COUNTY VALLEYS.
HIGH WIND WARNING UNTIL 1 PM PST SUNDAY FOR SAN BERNARDINO
COUNTY MOUNTAINS.
WIND ADVISORY FROM 9 PM THIS EVENING TO 1 PM PST SUNDAY FOR
SANTA ANA MOUNTAINS AND FOOTHILLS.
WIND ADVISORY FROM 9 PM THIS EVENING TO 1 PM PST SATURDAY 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...CO
AVIATION/MARINE...WESTERINK
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