970
FXUS66 KSGX 061131 CCA
AFDSGX
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
431 AM PDT SAT JUN 6 2026
SYNOPSIS
COOLER WEATHER FOR INLAND AREAS IS EXPECTED THIS WEEKEND INTO THE
FIRST HALF OF NEXT WEEK AS A TROUGH OF LOW PRESSURE MOVES OVER THE
REGION. THIS WILL ALSO BRING BREEZY CONDITIONS ACROSS THE
MOUNTAINS AND DESERTS THIS AFTERNOON AND TOMORROW AFTERNOON. HIGH
PRESSURE LOOKS TO EXPAND OVER THE WEST COAST BY THE LATTER HALF
OF NEXT WEEK, WHICH WOULD LEAD TO A WARMING TREND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
TODAY THROUGH TOMORROW NIGHT...
CURRENT SATELLITE IMAGERY REVEALS THAT THE MARINE LAYER HAS FORMED
AND FILLED IN ALONG THE COASTAL AREAS FOR SAN DIEGO AND ORANGE
COUNTIES, AND EXTENDS ROUGHLY AROUND 10 TO 15 MILES INLAND WITH
BASES OF AROUND 1500 TO 2000 FT ELEVATION. GIVEN HOW STRONG THE
INVERSION IS IN PLACE OVER THE REGION, IT IS LIKELY THAT THE MARINE
LAYER WILL STRUGGLE TO MIX OUT AND DISSIPATE LATER THIS AFTERNOON,
ESPECIALLY FOR LOCATIONS RIGHT ALONG THE COAST, WHERE THERE WILL
LIKELY BE LOW CLOUDS LINGERING THROUGHOUT THE AFTERNOON.
HIGH PRESSURE CONDITIONS CONTINUE TO DOMINATE THE REGION, HOWEVER,
THERE IS A MAJOR SHORTWAVE TROUGH UPSTREAM THAT IS ADVANCING
EASTWARD AND BEGINNING TO INFLUENCE THE AREA WITH COOLER
TEMPERATURES WITH A BETTER PUSH OF ONSHORE FLOW, AND BREEZY
CONDITIONS, ESPECIALLY FOR THE MOUNTAINS AND AREAS PRONE TO GUSTY
WINDS. THESE WINDS ARE NOT EXPECTED TO REACH ADVISORY LEVEL,
ALTHOUGH THERE MAY BE A FEW OCCASIONAL GUSTS APPROACHING 60 MPH
WITHIN THE SAN GORGONIO PASS. BY LATER THIS EVENING, THESE WINDS
WILL BEGIN TO DECOUPLE OVERNIGHT, BUT THEN PICK BACK UP TO BE GUSTY
AGAIN ON SUNDAY DURING THE AFTERNOON, BEING SLIGHTLY WEAKER.
TEMPERATURES WILL BE AROUND THE SAME FOR HIGHS ON SUNDAY, PERHAPS
JUST A SMIDGEN WARMER.
MONDAY THROUGH FRIDAY...
THERE HAS BEEN VERY LITTLE CHANGE IN THE EXTENDED FORECAST SINCE
PREVIOUS MODEL RUNS. AS THE TROUGH EXITS THE REGION TOWARDS THE
MIDDLE OF THE WEEK, AND AS THE OVERALL LONGWAVE PATTERN BEGINS TO
SHIFT MORE EAST AND ALLOWS A RIDGE OVER THE E PAC WATERS TO EXPAND
OVER THE WEST COAST REGION, IT WILL ALLOW FOR THERE TO BE A
GRADUAL WARMING TREND OCCURRING TOWARDS THE END OF THE UPCOMING
WEEK. THIS WILL ALSO ALLOW FOR THE MARINE LAYER TO LOWER WITH
POSSIBLE VIS RESTRICTION IMPACTS AS A RESULT CLOSER TO THE COASTAL
AREAS. CONDITIONS ARE EXPECTED TO REMAIN DRY THROUGH THEN.
AVIATION
061000Z...COAST/VALLEYS...LOW CLOUDS BASED 1300-1700 FT MSL ARE
COVERING SAN DIEGO AND ORANGE COUNTIES UP TO 20 MILES INLAND
CURRENTLY. CLOUDS WILL REACH INTO PORTIONS OF THE INLAND EMPIRE IN
THE NEXT FEW HOURS. VIS 2-6 SM FOR INLAND EDGE OF CLOUDS IN
VALLEYS/INLAND EMPIRE (I.E. KRNM, KONT). SCATTERING OUT FOR INLAND
AREAS 16-19Z SAT. CIGS MAY REMAIN BKN WITHIN 5-10 MILES OF THE
COASTLINE SATURDAY AFTERNOON, PARTICULARLY IN SAN DIEGO COUNTY.
CLOUDS MOVE INLAND AGAIN STARTING AROUND 00-02Z SUN WITH BASES 1800-
2300 FT MSL. SIMILAR INLAND EXTENT AS THIS MORNING WITH CLOUDS
FILLING INTO MOST OF THE COASTAL BASIN BY 12Z SUN.
MOUNTAINS/DESERTS...VFR WITH INCREASING CLOUDS AOA 20000FT MSL
THROUGH THIS EVENING. SOUTHWEST-WEST WINDS WILL INCREASE IN THE
MOUNTAINS AND DESERTS TODAY WITH GUSTS REACHING 30-40 KNOTS AFTER
21Z. WINDS SLOWLY DECREASE LATE THIS EVENING AND OVERNIGHT. MOD
UP/DOWNDRAFTS AND POCKETS OF LLWS IN LEE (NORTH AND EAST) OF
MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY NIGHT.
BEACHES
A SERIES OF LONG PERIOD (17-19 SECOND) SWELLS FROM THE SOUTH (200
DEGREES) WILL RESULT IN ELEVATED SURF THIS WEEKEND. SURF 4-6 FEET AT
SOUTH FACING BEACHES CURRENTLY THROUGH THIS EVENING, WITH SWELL AND
SURF WEAKENING SLIGHTLY ON SUNDAY. SURF BUILDS AGAIN MONDAY AS A 3-4
FOOT SWELL AT 18-19 SECONDS MOVES INTO THE REGION. SURF PEAKS TUES-
WED WITH SETS TO 5-8 FEET LIKELY AT SOUTH-FACING BEACHES, THEN
GRADUALLY DIMINISHES LATE NEXT WEEK.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...STEWEY
AVIATION/MARINE/BEACHES...KW
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