483  
FXUS66 KSGX 011102  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
402 AM PDT THU JUN 1 2023  
   
SYNOPSIS
 
 
WEAK HIGH PRESSURE OVER THE AREA FOR FRIDAY THROUGH THE WEEKEND  
WILL BRING INLAND WARMING TO SLIGHTLY ABOVE AVERAGE FOR THE  
DESERTS FOR SUNDAY WHILE BELOW AVERAGE HIGH TEMPERATURES CONTINUE  
FOR THE COAST AND VALLEYS. NIGHT AND COASTAL LOW CLOUDS WON'T  
SPREAD QUITE AS FAR INLAND FOR THE WEEKEND, BUT SHOULD STILL COVER  
MUCH OF THE VALLEYS. THERE WILL CONTINUE TO BE LIMITED OR NO  
DAYTIME CLEARING FOR COASTAL AREAS. FOR EARLY NEXT WEEK, A LOW  
PRESSURE SYSTEM FROM THE WEST WILL BRING COOLING AND DEEPENING OF  
THE MARINE LAYER ALONG WITH A SLIGHT CHANCE OF AFTERNOON AND  
EARLY EVENING THUNDERSTORMS, MAINLY FOR THE SAN BERNARDINO COUNTY  
MOUNTAINS AND DESERTS NORTHWARD.  
 

 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
 
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
   
SHORT TERM (TODAY THROUGH SATURDAY)
 
 
THE MARINE LAYER IS AROUND 5500 FEET DEEP WITH LOW CLOUDS OVER  
THE COASTAL WATERS EXTENDING WELL INLAND AND ONTO THE COASTAL  
MOUNTAIN SLOPES ONCE AGAIN. THERE HAS BEEN SOME LIGHT MEASURABLE  
AMOUNTS OVERNIGHT FROM DRIZZLE AND LIGHT RAIN WITH THE GREATEST  
COVERAGE NEAR HIGHER TERRAIN ALONG THE ORANGE COUNTY COAST AND IN  
THE INLAND VALLEYS AND COASTAL MOUNTAIN SLOPES IN SAN DIEGO  
COUNTY WITH AMOUNTS LESS THAN ONE-TENTH INCH THROUGH 3 AM.  
 
THE WEAK UPPER LOW OVER ARIZONA WILL MOVE EAST TODAY WITH A WEAK  
LOW PRESSURE SYSTEM MOVING ACROSS NORTHERN BAJA LATE TODAY AND  
TONIGHT. THIS WILL BE FOLLOWED BY WEAK HIGH PRESSURE ACROSS THE  
AREA THROUGH THE WEEKEND. THE MARINE LAYER WILL BECOME GRADUALLY  
SHALLOWER, BUT WITH COASTAL LOW CLOUDS EXTENDING ONTO THE LOWER  
COASTAL MOUNTAIN SLOPES FOR TONIGHT INTO FRIDAY MORNING AND ACROSS  
MOST OF THE VALLEYS FOR FRIDAY NIGHT INTO SATURDAY MORNING. LITTLE  
OR NO DAYTIME CLEARING WILL CONTINUE FOR COASTAL AREAS.  
 
INLAND AREAS WILL BEGIN TO WARM TODAY WITH GREATER WARMER FOR  
FRIDAY AND SATURDAY. WITH THE WARMING, HIGH TEMPERATURES FOR THE  
DESERTS WILL BE NEAR AVERAGE ON SATURDAY WITH PORTIONS OF THE  
VALLEYS STILL 5 TO LOCALLY 10 DEGREES BELOW AVERAGE.  
 

 
   
LONG TERM (SUNDAY THROUGH TUESDAY)
 
 
ON SUNDAY, A CLOSED LOW PRESSURE SYSTEM FROM THE WEST WILL BE  
MOVING TOWARD SOUTHERN CALIFORNIA WITH THE CENTER MOVING TO NEAR  
POINT CONCEPTION ON MONDAY. THAT LOW PRESSURE SYSTEM MAY THEN  
REMAIN IN THE VICINITY OF SOUTHERN CALIFORNIA FOR MUCH OF THE  
WEEK.  
 
THERE IS A SLIGHT CHANCE FOR ELEVATED CONVECTION IN THE MOUNTAINS  
AS EARLY AS SUNDAY AFTERNOON, BUT WITH CHANCES A LITTLE GREATER  
THOUGH SLIGHT FOR MONDAY AFTERNOON AND EARLY EVENING AND AGAIN  
FOR TUESDAY AFTERNOON AND EARLY EVENING AND MOSTLY FROM SAN  
BERNARDINO COUNTY NORTHWARD.  
 
MONDAY AND TUESDAY WILL BE COOLER AND THE MARINE LAYER WILL DEEPEN  
WITH NIGHT AND MORNING COASTAL LOW CLOUDS EXTENDING FARTHER INLAND  
AND ONTO THE COASTAL MOUNTAIN SLOPES AGAIN. COASTAL AREAS WILL  
CONTINUE TO SEE LITTLE OR NO DAYTIME CLEARING.  
 

 
   
AVIATION
 
 
010930Z...COASTS/VALLEYS/COASTAL MOUNTAIN SLOPES...BKN-OVC LOW  
CLOUDS WITH BASES 2500-4000 FEET MSL AND TOPS TO 6000 FEET WILL  
CONTINUE THIS MORNING. LOCAL CIGS DOWN TO 1500 FEET WITH PATCHY DZ  
AND VIS 3-5SM. COASTAL MOUNTAIN SLOPES REMAINING OBSCURED. PARTIAL  
CLEARING, MAINLY IN THE INLAND EMPIRE, AFTER 17Z, WITH AREAS OF LOW  
CLOUDS WITH BASES MOSTLY ABOVE 3000 FEET MSL ELSEWHERE. CLOUDS  
FILLING IN AGAIN AFTER 23Z WITH BASES AROUND 1500-2500 FEET MSL AND  
TOPS TO AROUND 4000 FEET.  
 
DESERT MOUNTAIN SLOPES/DESERTS...MOSTLY CLEAR WITH UNRESTRICTED VIS  
TODAY AND TONIGHT. AREAS OF WEST WINDS WITH GUSTS 30-40 KT 00-09Z  
WITH MODERATE UP/DOWNDRAFTS AND LLWS OVER AND EAST OF THE MOUNTAINS.  
 

 
   
MARINE
 
 
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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