734  
FXUS66 KSGX 031600 AAB  
AFDSGX  
 
AREA FORECAST DISCUSSION...UPDATED  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
900 AM PDT FRI OCT 3 2025  
   
SYNOPSIS
 
 
GUSTY WINDS EXPECTED OVER THE MOUNTAINS AND DESERTS, PEAKING THIS  
AFTERNOON AND OVERNIGHT. COOLER CONDITIONS TODAY, WITH WEAK OFFSHORE  
WINDS AND WARMING WEST OF THE MOUNTAINS SATURDAY. ANOTHER BRIEF COOL  
DOWN FOR EARLY NEXT WEEK, WITH A GRADUAL WARMING POSSIBLE INTO THE  
MIDDLE/END OF NEXT WEEK.  
 

 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
 
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
 
VISIBLE SATELLITE AT 9 AM WAS SHOWING PATCHY LOW CLOUD COVERAGE AT  
THE COAST AND INTO THE VALLEYS. THE STRONGEST WINDS THIS MORNING  
HAVE BEEN CONFINED TO THE SAN GORGONIO PASS WITH GUSTS IN THE 40 TO  
50 MPH RANGE. WINDS ARE EXPECTED TO CONTINUE TO INCREASE OVER THE  
MOUNTAINS AND INTO THE DESERTS THROUGH THE DAY, PEAKING IN STRENGTH  
IN THE LATE AFTERNOON AND OVERNIGHT HOURS. GUSTS 35 TO 55 MPH WITH  
GUSTS TO 65 MPH IN THE NORTHERN COACHELLA VALLEY BELOW THE SAN  
GORGONIO PASS. THE MARINE LAYER IS EXPECTED TO BE A SIMILAR DEPTH  
TONIGHT. HOWEVER, THE STRENGTH OF THE MARINE INVERSION IS STILL  
FAIRLY WEAK AND COVERAGE OF LOW CLOUDS OVER THE COAST AND VALLEYS  
WILL CONTINUE TO BE QUITE PATCHY TONIGHT INTO SATURDAY MORNING.  
 
THE UPPER LEVEL LOW THAT WILL MOVE THROUGH CALIFORNIA TODAY WILL  
QUICKLY MOVE INTO NEVADA SATURDAY. THAT WILL BRING A BRIEF PERIOD OF  
NORTHERLY WINDS SATURDAY MORNING. THOSE NORTHERLY WINDS WILL BE MOST  
PRESENT ON THE COASTAL MOUNTAIN SLOPES AND BELOW THE CAJON PASS. THE  
OFFSHORE WINDS MAY RESULT IN QUICKER CLEARING OF ANY CLOUDS THAT  
DEVELOP IN THE VALLEYS AND ORANGE COUNTY. ONSHORE FLOW WILL RETURN  
BY THE AFTERNOON. HIGH TEMPERATURES WILL WARM A FEW DEGREES WEST OF  
THE MOUNTAINS TOMORROW, WITH THE DESERTS STILL A FEW DEGREES COOLER.  
BY SUNDAY, MINIMAL CHANGE IN TEMPERATURES EXPECTED NEAR THE COAST  
WITH A FEW DEGREES OF WARMING FURTHER INLAND.  
 
A BROAD AREA OF LOW PRESSURE EXTENDING FROM THE INTERMOUNTAIN WEST  
WILL DIG SOUTH EARLY NEXT WEEK, WHICH WILL BRING SLIGHTLY COOLER  
CONDITIONS ON MONDAY. FOR THE MIDDLE TO END OF NEXT WEEK, MORE  
UNCERTAINTY ENTERS THE FORECAST. ENSEMBLE GUIDANCE IS ABOUT 50/50 ON  
WHETHER OR NOT A TROUGH OR A RIDGE WILL BE THE MAIN INFLUENCE ON  
SOUTHERN CALIFORNIA'S WEATHER. THIS IS EMPHASIZED BY THE 20 DEGREE  
SPREAD IN HIGH TEMPERATURES BETWEEN THE 90TH AND 10TH PERCENTILES OF  
TEMPERATURE GUIDANCE. IF A MORE TROUGHY PATTERN MATERIALIZES NEAR  
CALIFORNIA, IT'S POSSIBLE TROPICAL MOISTURE MAY BE DRAWN NORTHWARD  
INTO THE SOUTHWESTERN UNITED STATES, BRINGING AN INCREASE IN CLOUD  
COVERAGE AND A SLIGHT CHANCE OF SHOWERS. RIGHT NOW THE FORECAST  
CLOSELY FOLLOWS THE NBM FOR THE MIDDLE TO END OF NEXT WEEK.  
 

 
   
AVIATION
 
 
031515Z....COASTS/VALLEYS...LOW CLOUDS WILL CONTINUE TO SCATTER OUT  
FOR INLAND AREAS THROUGH 18Z, THEN FOR COASTAL AREAS 17-19Z, THOUGH  
ISOLATED PATCHES OF LOW CLOUDS COULD LINGER ALONG THE COAST THROUGH  
20Z. BREEZY WEST TO NORTHWEST WINDS EXPECTED FRIDAY AFTERNOON, WITH  
GUSTS TO AROUND 20 KTS THROUGH AROUND 02Z SATURDAY. LOW CLOUDS WILL  
REFORM IN PATCHES AFTER 4/00Z WITH BASES MOSTLY ABOVE 2000 FT MSL.  
CLOUDS INITIALLY FORM IN SAN DIEGO COUNTY FOOTHILLS/VALLEYS, THEN  
SPREADING NORTH OVERNIGHT, BUT REMAIN PATCHY FOR MOST LOCATIONS.  
SOME AREAS OF PATCHY DRIZZLE MAY BE POSSIBLE, ESPECIALLY FOR THE  
FOOTHILLS. THERE WILL BEGIN CLEARING FROM INLAND TO THE COAST ON  
SATURDAY BETWEEN 15-17Z.  
 
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS THROUGH FRIDAY  
NIGHT. STRONGER WINDS OUT OF THE WEST PICK UP AND BECOME MORE  
WIDESPREAD AFTER 18Z FRI THROUGH THE LATE AFTERNOON, ESPECIALLY FOR  
DESERTS AND DESERT FOOTHILLS, WITH GUSTS GENERALLY 25-35 KTS EXCEPT  
FOR TYPICALLY WINDY SPOTS GUSTING TO AROUND 45 KTS. WINDS SLOWLY  
DIMINISH AFTER 06Z SATURDAY.  
 

 
   
MARINE
 
 
NORTHWEST WINDS FRIDAY AFTERNOON AND EVENING OVER THE OUTER WATERS  
WILL LEAD TO HAZARDOUS CONDITIONS FOR SMALL CRAFT. EXPECTING  
SUSTAINED WINDS 20 TO 25 KTS, WITH OCCASIONAL GUSTS OVER 30 KTS  
POSSIBLE, AND CHOPPY SEAS 5 TO 8 FEET. WINDS WILL BE STRONGEST IN  
THE VICINITY OF SAN CLEMENTE ISLAND. WINDS WEAKEN LATE FRIDAY  
EVENING. NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED SATURDAY  
THROUGH MONDAY.  
 

 
   
SKYWARN
 
 
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE  
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.  
 

 
   
SGX WATCHES/WARNINGS/ADVISORIES
 
 
CA...WIND ADVISORY UNTIL 11 PM PDT THIS EVENING FOR APPLE AND LUCERNE  
VALLEYS.  
 
WIND ADVISORY FROM 4 PM THIS AFTERNOON TO 5 AM PDT SATURDAY FOR  
SAN DIEGO COUNTY DESERTS.  
 
WIND ADVISORY UNTIL 5 AM PDT SATURDAY FOR SAN GORGONIO PASS NEAR  
BANNING.  
 
PZ...SMALL CRAFT ADVISORY UNTIL 11 PM PDT THIS EVENING FOR WATERS  
FROM SAN MATEO POINT TO THE MEXICAN BORDER EXTENDING 10 TO  
60 NM OUT INCLUDING SAN CLEMENTE ISLAND.  
 

 
 

 
 
PUBLIC...CO  
AVIATION/MARINE...STEWEY  
 
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