000  
FXUS66 KSGX 282052  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
152 PM PDT SAT JUN 28 2025  
   
SYNOPSIS
 
 
HIGH TEMPERATURES WILL WARM A FEW TO AROUND 5 DEGREES THIS WEEKEND  
WITH HIGH TEMPERATURES WITHIN A FEW DEGREES OF AVERAGE TO AROUND  
5 DEGREES ABOVE AVERAGE. HIGH TEMPERATURES WILL THEN COOL ABOUT 5  
DEGREES THROUGH THE MIDDLE PART OF NEXT WEEK WITH HIGH  
TEMPERATURES ON THURSDAY AROUND AVERAGE TO AROUND 5 DEGREES BELOW  
AVERAGE FOR THE VALLEYS. THE MARINE LAYER LOWERS SOME THIS  
WEEKEND, BUT LIFTS AGAIN EARLY NEXT WEEK, WITH NIGHT AND MORNING  
COASTAL LOW CLOUDS SPREADING INTO THE WESTERN VALLEYS, CLEARING BY  
THE MID-LATE MORNINGS.  
 

 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
 
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
 
A WARM AND DRY WEEKEND IS ON TAP AS THE SUBTROPICAL RIDGE AXIS  
STRETCHES OVER SOUTHERN CALIFORNIA. THIS IS RESULTING IN  
TEMPERATURES ACROSS THE INLAND VALLEYS REACHING THE UPPER 80S TO LOW  
90S IN THE SAN DIEGO COUNTY VALLEYS AND THE MID TO UPPER 90S FOR  
THE INLAND EMPIRE, WHILE THE DESERTS SEE HIGHS 105-110. WHILE  
THESE TEMPERATURES ARE ONLY ABOUT 5 DEGREES ABOVE AVERAGE FOR THE  
INLAND VALLEYS, TODAY/SUNDAY WILL STILL FEATURE THE HOTTEST  
TEMPERATURES OF THE WEEK AS THE RIDGE RETREATS EASTWARD. A FAIRLY  
STAGNANT UPPER LEVEL PATTERN IS THEN ESTABLISHED LATE SUNDAY WITH  
THE RIDGE NOW IN PLACE ACROSS THE FOUR CORNERS AND A CUT-OFF LOW  
CENTERED ABOUT 200- 300 MILES OFF THE COAST OF CALIFORNIA. THIS  
PATTERN PERSISTS THROUGH MID-WEEK WHEN THE TROUGH SLIDES EASTWARD  
OVER CALIFORNIA ON WEDNESDAY INTO THURSDAY. THROUGH THIS STAGNANT  
PATTERN, THE DESERTS STAY HOT MONDAY INTO TUESDAY WHILE THE INLAND  
VALLEYS ARE A LITTLE COOLER. STILL, THE DESERTS VERY SLOWLY COOL  
MONDAY THROUGH WEDNESDAY. THE PATTERN BEGINS TO GROW MORE  
UNCERTAINTY THURSDAY THROUGH THE END OF THE WEEK. WITHIN THIS  
UNCERTAINTY, WHAT APPEARS MORE CERTAIN IS THE INCREASE IN  
MONSOONAL ACTIVITY, ALTHOUGH STAYING EAST OF SOCAL.  
 

 
   
AVIATION
 
 
282100Z....COAST/VALLEYS...VFR CONDITIONS THIS AFTERNOON. LOW CLOUDS  
BASED 700-1200 FT MSL REDEVELOP AND PUSH INLAND TONIGHT UP TO 5-10  
MILES WITH SIMILAR OR SLIGHTLY LOWER BASES GENERALLY AFTER 04Z.  
AREAS OF 1-5SM VISIBILITY FOR WESTERN VALLEYS AND HIGHER COASTAL  
TERRAIN. LOCALLY BELOW A MILE 11-14Z SUN. CLEARING 15-17Z.  
   
MOUNTAINS/DESERTS
 
SW/W WIND GUSTS 25-35 KTS ACROSS THE DESERTS  
AND MOUNTAIN PASSES THIS AFTERNOON AND EARLY EVENING LEADING TO MOD  
UDDFS AT TIMES. WINDS WEAKEN SUBSTANTIALLY BY 06Z SUNDAY.  
 

 
   
MARINE
 
 
PERIODS OF GUSTY NORTHWEST WINDS AROUND 15 TO 18 KNOTS POSSIBLE IN  
THE OUTER COASTAL WATERS NEAR SAN CLEMENTE ISLAND THIS AFTERNOON AND  
EVENING. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED  
THROUGH WEDNESDAY.  
 

 
   
SGX WATCHES/WARNINGS/ADVISORIES
 
 
CA...NONE.  
PZ...NONE.  
 

 
 

 
 
PUBLIC...MUNYAN  
AVIATION/MARINE...WESTERINK  
 
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