671  
FXUS66 KSGX 021128  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
235 AM PDT THU OCT 2 2025  
   
SYNOPSIS  
 
TODAY WILL BE A FEW DEGREES WARMER WITH COOLING FOR FRIDAY INTO  
SATURDAY AS A LOW PRESSURE SYSTEM MOVES INLAND INTO CALIFORNIA AND  
NEVADA. THERE WILL BE STRONGER SOUTHWEST TO WEST WINDS FOR THE  
MOUNTAINS AND DESERTS ON FRIDAY WITH GUSTS TO 35 TO 45 MPH ALONG  
THE EAST SLOPES OF THE MOUNTAINS. THE MARINE LAYER WILL DEEPEN FOR  
FRIDAY INTO EARLY SATURDAY WITH COASTAL LOW CLOUDS SPREADING INTO  
PORTIONS OF THE INLAND VALLEYS FOR FRIDAY NIGHT. LOW PRESSURE  
FROM THE NORTH WILL SPREAD COOLING OF A FEW TO AROUND 5 DEGREES  
INLAND FOR SUNDAY AND MONDAY. THEN A FEW DEGREES WARMER FOR  
TUESDAY AND ANOTHER 5 DEGREES WARMER FOR WEDNESDAY.  
 
 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE  
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
   
SHORT TERM (TODAY THROUGH SATURDAY)  
 
HIGH PRESSURE TO THE EAST WILL BRING A FEW MORE DEGREES OF WARMING  
TODAY. THIS WILL BE FOLLOWED BY COOLING FOR FRIDAY INTO SATURDAY  
AS A LOW PRESSURE SYSTEM MOVES INLAND INTO CALIFORNIA AND NEVADA.  
ON FRIDAY, THERE WILL BE STRONGER ONSHORE FLOW WITH STRONGER  
SOUTHWEST TO WEST WINDS FOR THE MOUNTAINS AND DESERTS  
WITH GUSTS TO 35 TO 45 MPH ALONG THE EAST SLOPES OF THE MOUNTAINS.  
 
THE MARINE LAYER IS AROUND 1200 TO 1400 FEET DEEP WITH A WEAK  
INVERSION. SATELLITE IMAGERY SHOWS ONLY PATCHY COVERAGE OF COASTAL  
LOW CLOUDS. PATCHY NIGHT AND MORNING LOW CLOUDS WILL INCREASE IN  
COVERAGE AND SPREAD FARTHER INLAND FOR FRIDAY INTO EARLY SATURDAY  
AS THE MARINE LAYER DEEPENS. THE LOW CLOUDS FOR LATE FRIDAY NIGHT  
INTO EARLY SATURDAY WILL SPREAD INTO PORTIONS OF THE INLAND  
VALLEYS AND POSSIBLY ONTO THE LOWER COASTAL MOUNTAIN SLOPES.  
 
 
   
LONG TERM (SUNDAY THROUGH WEDNESDAY)  
 
LOW PRESSURE FROM THE NORTH WILL SPREAD COOLING OF A FEW TO AROUND  
5 DEGREES INLAND FOR SUNDAY AND MONDAY WITH HIGH TEMPERATURES ON  
MONDAY 5 TO 10 DEGREES BELOW AVERAGE FOR INLAND AREAS. HIGH  
TEMPERATURES ON MONDAY WILL RANGE FROM AROUND 70 NEAR THE COAST TO  
THE MID 70S TO AROUND 80 FOR THE INLAND EMPIRE WITH THE LOWER  
DESERTS AROUND 90.  
 
THIS WILL BE FOLLOWED BY WARMING FOR TUESDAY AND WEDNESDAY WITH  
WEDNESDAY HIGH TEMPERATURES STILL A FEW DEGREES BELOW AVERAGE,  
RANGING FROM AROUND 70 NEAR THE COAST TO THE LOWER TO MID 80S FOR  
THE INLAND EMPIRE WITH THE LOWER 90S FOR THE LOWER DESERTS.  
 
 
   
AVIATION  
 
020930Z....COASTS/VALLEYS...VARIABLE LOW CLOUDS BASED 1000-1500 FEET  
MSL WILL GRADUALLY INCREASE THROUGH 14Z. LOCAL VIS REDUCED 1-5SM ON  
HIGHER COASTAL TERRAIN. SCATTER OUT EXPECTED BY 16Z. LOW CLOUDS  
DEVELOP AFTER 03Z COASTAL AREAS AND AFTER 08Z INLAND TONIGHT INTO  
FRIDAY. BASES SHOULD BE AROUND 1500 FEET MSL, RISING OVER 2000 FEET  
MSL EARLY FRIDAY, FILLING MUCH OF THE COASTAL BASIN.  
 
MOUNTAINS/DESERTS...MOSTLY CLEAR AND VFR CONDITIONS TODAY AND  
TONIGHT.  
 
 
   
MARINE  
 
NORTHWEST WINDS FRIDAY AFTERNOON AND EVENING OVER THE OUTER WATERS  
NEAR SAN CLEMENTE ISLAND COULD LEAD TO HAZARDOUS CONDITIONS FOR  
SMALL CRAFT. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED  
THROUGH MONDAY.  
 
 
   
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...17  
AVIATION/MARINE...MM  
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