FXUS66 KSGX 301716
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 AM PST MON NOV 30 2009

.SYNOPSIS...WEAKENING OFFSHORE FLOW WILL CAUSE LOCAL GUSTY WINDS 
THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES TODAY. HIGH PRESSURE 
ALOFT WILL MAINTAIN FAIR WEATHER THROUGH FRIDAY EXCEPT FOR 
OCCASIONAL COASTAL LOW CLOUDS AND FOG. A COUPLE OF UPPER LEVEL LOW 
PRESSURE SYSTEMS WILL BRING MORE CLOUDS AND COOLING THIS WEEKEND AND 
EARLY NEXT WEEK WITH A CHANCE OF SHOWERS MONDAY. 

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

.SHORT TERM (TODAY-THURSDAY)...SKIES WERE CLEAR TODAY. THE 12Z NKX 
SOUNDING HAD A SURFACE BASED INVERSION WITH INCREASING NE TO N WINDS 
THROUGH 40000 FT. OFFSHORE GRADIENTS WITH ABOUT -10 MB SAN-TPH. 

THE UPPER LOW OVER NW MEXICO WILL SHIFT E TODAY CAUSING THE 
MODERATELY STRONG NE WINDS ALOFT TO DECREASE. THE OFFSHORE GRADIENTS 
WILL ALSO DECREASE TODAY FOR WEAKENING WINDS THROUGH AND BELOW 
MOUNTAIN CANYONS AND PASSES. AN UPPER LEVEL RIDGE OF HIGH PRESSURE 
WILL SLOWLY SHIFT E ONTO THE W COAST. ONSHORE FLOW WITH SOME MARINE 
LAYER CLOUDS WILL BRIEFLY RETURN TUESDAY NIGHT...DECREASING 
WEDNESDAY NIGHT. WEAK OFFSHORE FLOW SHOULD DEVELOP THURSDAY. THERE 
WILL ALSO BE MORE HIGH CLOUDINESS WEDNESDAY INTO THURSDAY IN NW 
WINDS ALOFT. MAX TEMPS IN MOST AREAS WILL BE NEAR OR SLIGHTLY BELOW 
SEASONAL AVERAGES THROUGH WEDNESDAY AND THEN INCREASE TO SLIGHTLY 
ABOVE THURSDAY. 

&&

.LONG TERM (FRIDAY-MONDAY)...THE UPPER HIGH WILL SHIFT E AND THE WEAK
OFFSHORE FLOW WILL WEAKEN EVEN FURTHER FRIDAY FOR MINOR CHANGES IN 
THE LOCAL WEATHER. A TROUGH FOLLOWED BY FLAT WLY FLOW WILL BRING 
MORE HIGH CLOUDINESS AND COOLING SATURDAY AND SUNDAY. ANOTHER TROUGH 
APPROACHING FROM THE W COULD BRING SHOWERS BY MONDAY. 

&&

.AVIATION...
301600Z...ONLY AVIATION CONCERN IS WITH WINDS ALOFT. AREAS OF 30 TO 
40 KT NE WINDS OVER THE RIDGES MAY RESULT IN MOUNTAIN WAVES AND UP 
AND DOWN DRAFTS DOWNSTREAM OVER THE VALLEYS AND COASTAL AREAS 
THROUGH THIS AFTERNOON. PERIODS OF LLWS WILL BE POSSIBLE AS WELL. 
OTHERWISE...VFR WITH UNRESTRICTED VIS THROUGH TONIGHT.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

WIND ADVISORY FOR THE SAN BERNARDINO MOUNTAINS...THE SANTA ANA       
MOUNTAINS AND THE INLAND EMPIRE UNTIL 2 PM.

&&

$$

PUBLIC...ATKIN  
AVIATION...JAD