462  
FXUS66 KSGX 261526  
AFDSGX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
826 AM PDT FRI AUG 26 2016  
   
SYNOPSIS
 
 
A TROUGH ALONG THE WEST COAST WILL KEEP TEMPERATURES BELOW AVERAGE  
ALONG WITH A DEEPER MARINE LAYER THROUGH SATURDAY. HIGH PRESSURE  
BUILDING OVER THE SOUTHWEST EARLY NEXT WEEK WILL BRING WARMER DAYS  
AND A SHALLOWER MARINE LAYER BEFORE ANOTHER TROUGH MOVES IN FOR  
THE MIDDLE TO LATTER PART OF NEXT WEEK.  
 

 
   
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
 
 
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO  
COUNTIES...  
 
THE MARINE LAYER BLOSSOMED OVERNIGHT INTO A JUNE-LIKE VERSION AT  
2600 FEET DEEP. CLOUDS FILLED THE ENTIRE COASTAL BASIN ALL THE WAY  
TO THE MOUNTAIN FOOTHILLS. MEANWHILE, ON THE SUNNY SIDE OF THE  
MOUNTAINS, SOME ALTOCUMULUS CLOUDS SHOWED UP TO ACCENT THE SUNRISE  
IN THE MOUNTAINS AND DESERTS. TODAY WILL BE COOLER IN ALL AREAS  
THANKS TO A WEAK LOW PRESSURE TROUGH THAT MOVES THROUGH SOUTHERN  
CALIFORNIA TODAY AND SATURDAY. TONIGHT THE MARINE LAYER WILL BE  
ABOUT AS DEEP, AND THE CLOUDS AS EXTENSIVE. AREAS OF GUSTY ONSHORE  
WINDS WILL DEVELOP THIS AFTERNOON AND EVENING IN THE USUAL  
MOUNTAIN PASSES AND DESERT SLOPES. OVER THE WEEKEND SOME HIGH  
PRESSURE ALOFT REBUILDS, BUT NOT TO A GREAT DEGREE. ENOUGH TO  
SUPPRESS OUR MARINE LAYER AND CONFINE COASTAL CLOUDS TO THE  
COAST. ALSO THE ONSHORE WINDS WILL WEAKEN. TEMPERATURES WILL BE  
MUCH BELOW AVERAGE THROUGH SATURDAY, WARMER SUNDAY, AND FINALLY  
CLOSE TO AVERAGE BY MONDAY. THE EURO MODEL SEEMS TO HAVE HAD A  
BETTER HANDLE ON NEXT WEEK'S WARMING TREND WITH A MORE  
CONSERVATIVE APPROACH ALL WEEK LONG. IN CONTRAST, THE GFS HAD  
BEEN SHOWING A STRONG HOT RIDGE, BUT NOW HAS RECOGNIZED THE ERROR  
OF ITS WAYS AND BACKED OFF INTO DECENT AGREEMENT WITH THE EURO.  
OBVIOUSLY, CONFIDENCE IS HIGHER IN THE EURO MODEL BEYOND THREE  
DAYS. SO NEXT WEEK WILL BE WARMER, BUT WITH TEMPERATURES ONLY  
RISING A LITTLE ABOVE AVERAGE TUESDAY AND POSSIBLY WEDNESDAY.  
ANOTHER TROUGH BEARS DOWN FROM THE NORTHWEST LATER NEXT WEEK. THAT  
WOULD BRING ANOTHER COOLING TREND WITH A DEEPER MARINE LAYER  
HEADING INTO THE LABOR DAY (ALREADY?) WEEKEND.  
 

 
   
AVIATION
 
 
261515Z...COAST/VALLEYS...STRATUS WILL CLEAR MORE SLOWLY TODAY WITH  
MOST VALLEYS CLEARING 16Z-17Z AND COASTAL AREAS 17Z-19Z. BASES OF  
CIGS WILL BE AROUND 2000 FT MSL WITH TOPS TO 2700 FT MSL. AFTER A  
MOSTLY SUNNY AFTERNOON, STRATUS WILL SPREAD INTO COASTAL AREAS 01Z-  
04Z AND EVENTUALLY COVER MOST VALLEYS BY 10Z. BASES WILL BE 1700-  
2200 FT MSL WITH TOPS TO 2800 FT MSL. LOCAL VIS BELOW 3 MILES WILL  
OCCUR IN THE VALLEYS 10Z-15Z SAT WITH HIGHER TERRAIN OBSCURRED.  
CLEARING TIMES WILL BE SIMILAR SAT MORNING.  
 
MOUNTAINS/DESERTS...MOSTLY CLEAR WITH UNRESTRICTED VIS THROUGH  
SATURDAY EXCEPT FOR A FEW AFTERNOON CUMULUS OVER HIGHEST MOUNTAINS.  
 

 
   
MARINE
 
 
NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH WEDNESDAY.  
 

 
   
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...MAXWELL  
 
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