982  
FXUS66 KSGX 181558  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
858 AM PDT FRI AUG 18 2017  
   
SYNOPSIS
 
 
FAIR AND MILD WEATHER WILL CONTINUE THIS COMING WEEK, WITH COASTAL  
CLOUDS EXTENDINIG INTO VALLEYS DURING NIGHTS AND MORNINGS.  
 

 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
 
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
 
THE MARINE LAYER PROVIDED A MORE UNIFORM CLOUD COVERAGE OVERNIGHT  
AND THIS MORNING ALONG THE COAST AND IN THE WESTERN VALLEYS. THE  
CLEARING TODAY SHOULD BE THE USUAL FARE, WITH ALL AREAS SUNNY BY  
LATE MORNING. A LOW PRESSURE TROUGH HAS BEGUN TO SPIN JUST OFF THE  
CALIFORNIA COAST. THIS WILL DEEPEN SLIGHTLY THIS WEEKEND AND  
DEEPEN THE MARINE LAYER, ALLOWING COASTAL CLOUDS TO EXTEND JUST A  
LITTLE FARTHER INLAND FOR SUNDAY AND MONDAY. AT THE SAME TIME,  
THE SOUTHERLY FLOW ON THE EAST SIDE OF THE TROUGH WILL DRAW  
MONSOON MOISTURE INTO SOUTHEAST CALIFORNIA. SO WE EXPECT SOME  
MIDDLE AND HIGHER CLOUDS MAINLY MONDAY, BUT ALSO SOME AFTERNOON  
CUMULUS OVER THE MOUNTAINS AND DESERTS. WILL THESE CLOUDS PRODUCE  
SHOWERS OR THUNDERSTORMS? RIGHT NOW WE THINK NOT, BUT IT'S CLOSE,  
SO IF THE GUIDANCE TRENDS MORE IN THAT DIRECTION WE'LL PROBABLY  
BEGIN TO INCLUDE THE SMALL CHANCES SUNDAY AND EVEN MORE ON  
MONDAY. THOSE DAYS ARE COMING INTO THE HIGH RESOLUTION MODEL'S  
WINDOWS SO WE'LL HAVE MORE GUIDANCE TO USE AND HELP US FINE-TUNE  
THAT FORECAST ELEMENT. FOR THOSE WHO LIKE MILD SUMMER WEATHER,  
ENJOY THIS COMING WEEK AS IT APPEARS TEMPERATURES WILL COME IN A  
LITTLE BELOW AVERAGE EVERY DAY.  
 

 
   
AVIATION
 
 
181530Z...COAST/VALLEYS...LOOK FOR THE LOW CLOUDS TO CLEAR TO THE  
COAST BETWEEN 15Z AND 17Z, WITH PATCHY LOW CLOUDS LINGERING OVER THE  
COASTAL WATERS THEREAFTER THROUGH 03Z THIS EVENING. LIGHT WESTERLY  
SEA BREEZES ARE EXPECTED BETWEEN 17Z THIS AFTERNOON AND 03Z THIS  
EVENING. LOW CLOUDS WITH BASES NEAR 1500 FT MSL WILL SLOWLY RETURN  
TO AREAS WITHIN 25 MILES OF THE COAST AFTER 03Z SATURDAY.  
 
MOUNTAINS/DESERTS...MOSTLY CLEAR SKIES AND UNRESTRICTED VISIBILITY  
WILL CONTINUE THROUGH THIS WEEKEND.  
 

 
   
MARINE
 
 
NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH TUESDAY NIGHT.  
 

 
   
BEACHES
 
 
A MODERATE PERIOD SOUTH SWELL (2-3 FT AT 200 DEGREES) WILL CONTINUE  
THROUGH THIS WEEKEND. THIS SWELL WILL INCREASE SURF, WITH SETS TO 5  
FT POSSIBLE NORTH OF CARLSBAD. MODERATE STRENGTH RIP CURRENTS WILL  
ACCOMPANY THE SURF.  
 

 
   
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...MM  
AVIATION/MARINE/BEACHES...BROTHERTON  
 
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