362  
FXUS66 KSGX 041548  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
848 AM PDT FRI JUL 4 2025  
   
SYNOPSIS
 
 
MINOR WARMING THROUGH THE HOLIDAY WEEKEND WITH HIGHS NEAR NORMAL  
AND NIGHT AND MORNING LOW CLOUDS CONTINUING ALONG THE COASTAL  
AREAS AND WESTERN VALLEYS. A RIDGE OF HIGH PRESSURE WILL STRENGTHEN  
OVER THE REGION, LEADING TO BUILDING CONFIDENCE IN A HEAT WAVE  
ACROSS THE AREA AND THE POTENTIAL FIRST PUSH OF MONSOON MOISTURE  
BY THE MIDDLE OF NEXT WEEK.  
 

 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
 
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
 
.MORNING UPDATE..  
 
LOW CLOUDS WILL CONTINUE TO CLEAR TO THE COAST THIS MORNING, WITH  
MOSTLY CLEAR CONDITIONS EXPECTED THROUGH THE AFTERNOON. LOW CLOUDS  
WILL START TO FILTER BACK INTO SAN DIEGO COUNTY BETWEEN 8-10 PM  
TONIGHT, AN HOUR OR TWO LATER ACROSS ORANGE COUNTY. WITH CLOUD  
BASES NEAR 1,000 FEET, CLOUDS WILL BE HIGH ENOUGH TO NOT IMPACT  
ANY FIREWORK DISPLAYS ACROSS MOST AREAS. CLOUD COVER TIMING AND  
COVERAGE ACROSS THE COAST AND WESTERN VALLEYS WILL BE SIMILAR  
THROUGH THE HOLIDAY WEEKEND. MOST LOCATIONS WILL FEEL A TOUCH  
WARMER TODAY COMPARED TO YESTERDAY, WITH SIMILAR HIGHS EXPECTED  
INTO SATURDAY AND SUNDAY. WE STILL CONTINUE TO WATCH FOR THE  
UPCOMING HEAT WAVE NEXT WEEK, SO STAY TUNED.  
   
PREVIOUS DISCUSSION (331 AM FRIDAY)
 
 
TODAY THROUGH THIS WEEKEND...  
 
THE TROUGHING OVER THE EASTERN PACIFIC WATERS IS GOING TO REMAIN  
NEARLY IN PLACE THROUGHOUT THIS PERIOD IN THE FORECAST, WHICH LITTLE  
CHANGE WITH RESPECT TO TEMPERATURES, WITH ONLY A VERY GRADUAL WARMUP  
EACH DAY. IN TERMS OF THE MARINE LAYER, COVERAGE IS GOING TO BE  
SIMILAR TONIGHT, WITH SOME OF THESE LOW CLOUDS MAKING IT INTO THE  
INLAND EMPIRE (IE) AGAIN. AN UPPER LEVEL LOW WILL FORM OFF THE COAST  
OF NORTHERN CALIFORNIA BY LATER IN THE DAY ON SUNDAY AND THEN  
SLOWLY TRANSITION SOUTHWARD. MEANWHILE, THE RIDGE OVER THE DESERT  
SOUTHWEST IS GOING TO CONTINUE TO STRENGTHEN, WHICH WILL RESULT  
IN THE LOWER DESERTS GETTING BACK TO BEING ABOVE 110F BY SUNDAY.  
CONDITIONS WILL REMAIN DRY, ALTHOUGH GIVEN THE POSITION OF THE  
LOW, SOME OF THE LOW CLOUDS THICKENING UP DURING THE OVERNIGHT  
HOURS AND PRODUCING SOME POSSIBLE VERY LIGHT DRIZZLE FOR LOCATIONS  
WEST OF THE MOUNTAINS CANNOT BE RULED OUT COMPLETELY.  
 
MONDAY THROUGH THURSDAY...  
 
BY NEXT WEEK, THE U/L LOW POSITIONED OUT OVER THE COASTAL WATERS  
WILL BEGIN TO PROPAGATE BACK UP TOWARDS THE NORTH AND EVENTUALLY  
BECOME ABSORBED BACK INTO THE LONGWAVE TROUGH UPSTREAM.  
MEANWHILE, THE RIDGE TO THE EAST IS GOING TO FURTHER STRENGTHEN  
AND SLIGHTLY RETROGRADE BACK TOWARDS THE WEST A LITTLE. AS THE  
RIDGE AXIS GETS CLOSER TO THE CWA, TEMPERATURES ARE ALSO GOING TO  
CONTINUE TO RISE, ESPECIALLY FOR THE INLAND AREAS. BY THE MIDDLE  
OF NEXT WEEK (WEDNESDAY), TEMPERATURES WILL LIKELY TOP 100F FOR  
MOST LOCATIONS WITHIN THE IE, AND EVEN APPROACHING 80F FOR MOST OF  
THE COASTAL AREAS. SOME INCREASED MOISTURE COULD HELP TO SLIGHTLY  
MODIFY TEMPERATURES ON THE COOLER SIDE. CONDITIONS WILL CONTINUE  
TO REMAIN DRY THROUGH THE END OF NEXT WEEK.  
 

 
   
AVIATION
 
 
041530Z....COAST/VALLEYS...SATELLITE SHOWS LOW CLOUDS WITH BASES  
1500-1800FT MSL AND TOPS TO 2000FT MSL ARE QUICKLY BURNING OFF, WITH  
COASTAL SITES EXPECTED TO BECOME FEW-SCT BY 16Z. LOCALIZED AREAS OF  
PATCHY LOW CLOUDS MAY HANG JUST OFFSHORE OVER THE NEXT SEVERAL  
HOURS, ALTHOUGH MOST IF NOT ALL LOCATIONS WILL BE CLEAR BY THE  
AFTERNOON. LOW CLOUDS WITH SLIGHTLY LOWER BASES 900-1300 FT MSL  
REFORM AND PUSH BACK ASHORE AFTER 03Z SAT. LESS INLAND EXTENT WITH  
CLOUDS ONLY REACHING AROUND 10-15 MILES INLAND BY 12Z SAT. QUICK  
BURN OFF BY 16Z EXPECTED AGAIN ON SATURDAY.  
 
VIS RESTRICTIONS (2-5SM) WILL BE POSSIBLE IN FU ASSOCIATED WITH  
FIREWORKS THIS EVENING, ESPECIALLY IN ORANGE COUNTY AND WESTERN IE.  
LOCALIZED SPOTS MAY BRIEFLY FALL TO 1SM BELOW 1000FT MSL.  
 
MOUNTAINS/DESERTS...SUNNY WITH MOSTLY UNRESTRICTED VIS THROUGH  
SATURDAY MORNING. LOCATIONS NEAR FIREWORKS DISPLAYS MAY BRIEFLY SEE  
REDUCED VIS DUE TO FU GENERALLY BELOW 1000FT MSL.  
 

 
   
MARINE
 
 
NO HAZARDOUS MARINE WEATHER CONDITIONS ARE EXPECTED THROUGH TUESDAY.  
 

 
   
BEACHES
 
 
SOUTHERLY SWELL (190 DEGREES) OF 3 FEET AT 15-17 SECONDS WILL  
GENERATE ELEVATED SURF OF 3-6 FT WITH SETS TO 7 FT ALONG SOUTH  
FACING BEACHES THROUGH SATURDAY. IN ADDITION, STRONG RIP AND  
LONGSHORE CURRENTS EXPECTED AT ALL BEACHES TODAY AND SATURDAY. A  
BEACH HAZARDS STATEMENT IS IN EFFECT AND CONTAINS MORE INFORMATION.  
SWELL AND SURF WILL BEGIN TO LOWER ON SUNDAY.  
 

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

 
   
SGX WATCHES/WARNINGS/ADVISORIES
 
 
CA...BEACH HAZARDS STATEMENT THROUGH SATURDAY EVENING FOR ORANGE  
COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.  
 
PZ...NONE.  
 

 
 

 
 
PUBLIC...APR/STEWEY  
AVIATION/MARINE/BEACHES...ZUBER  
 
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