996
FXUS66 KSGX 081043
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
243 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
081030Z...FEW-SCT LOW CLOUDS WITH BASES AROUND 2000-2500 FT MSL ARE
PRESENT THIS MORNING, MAINLY IN SAN DIEGO COUNTY. THESE CLOUDS MAY
BRIEFLY BRING BKN CIGS TO KSAN OR KCRQ, THOUGH WILL BE FAIRLY SHORT
IN DURATION. LOW CLOUDS ARE MORE BKN-OVC ALONG THE COASTAL SLOPES
AND MOUNTAINS, WITH OBSCURATIONS IN HIGHER TERRAIN EXPECTED THROUGH
17Z. THESE CLOUDS WILL FULLY CLEAR OUT BY 15-20Z THIS MORNING, WITH
VFR CONDITIONS AND MOSTLY CLEAR SKIES EXPECTED THEREAFTER.
BREEZY ONSHORE FLOW EXPECTED ACROSS THE COASTS AND VALLEYS TODAY,
WITH WEST TO NORTHWEST GUSTS 20-25 KTS EXPECTED FROM 18Z-00Z FRIDAY.
MUCH STRONGER WESTERLY WINDS EXPECTED ACROSS THE MOUNTAINS AND
DESERTS TODAY WITH 25-40 KT GUSTS ACROSS THE DESERTS AND 40-55 KT
GUSTS ACROSS THE DESERT SLOPES AND MOUNTAIN PASSES. MOD/STG UDDFS
EAST OF THE MOUNTAINS EXPECTED THROUGH MUCH OF THE DAY TODAY. WINDS
GRADUALLY WEAKENING AFTER 00Z FRIDAY, BUT QUICKLY SHIFT TO NORTH-
NORTHEASTERLY OFFSHORE FLOW BY 06Z FRIDAY. WIND GUSTS INCREASE FOR
THE MOUNTAIN PASSES AND THROUGH INLAND VALLEYS BY 12Z FRIDAY WITH
MOD/STG UDDFS EXPECTED TO SHIFT TO THE WESTERN/SOUTHERN FOOTHILLS OF
MOUNTAINS.
MARINE
GUSTY NORTHWEST WINDS STRENGTHEN THIS MORNING, WITH GUSTS 25-30
KNOTS IN THE OUTER WATERS AND GUSTS 20-25 KTS WITHIN 10 MILES OF THE
COAST ON TODAY, PEAKING IN THE AFTERNOON. THESE HAZARDOUS WIND GUSTS
DECREASE 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 FROM 10 AM THIS MORNING TO 1 PM PST SATURDAY FOR
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND
EMPIRE.
HIGH WIND WARNING FROM 10 AM THIS MORNING TO 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 FROM 7 AM THIS MORNING TO 10 PM PST THIS
EVENING FOR COASTAL WATERS FROM SAN MATEO POINT TO THE
MEXICAN BORDER AND OUT TO 10 NM.
SMALL CRAFT ADVISORY UNTIL 10 PM PST THIS EVENING FOR WATERS
FROM SAN MATEO POINT TO THE MEXICAN BORDER EXTENDING 10 TO
60 NM OUT INCLUDING SAN CLEMENTE ISLAND.
PUBLIC...MM
AVIATION/MARINE...MUNYAN
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