FXUS66 KSGX 302133
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 PM PST MON NOV 30 2009
.SYNOPSIS...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 (REMAINDER OF TODAY-THURSDAY)...SKIES WERE CLEAR EARLY
THIS AFTERNOON. NE WINDS ALOFT AROUND THE N SIDE OF THE UPPER LOW
OVER NW MEXICO...COMBINED WITH OFFSHORE GRADIENTS CAUSED LOCAL
BREEZY CONDITIONS ACROSS IN THE MOUNTAINS AND BELOW THE CANYONS AND
PASSES. OFFSHORE GRADIENTS WERE DECREASING WITH ABOUT -7 MB SAN-TPH.
THE UPPER LOW OVER NW MEXICO WILL CONTINUE TO SHIFT E AND THE
OFFSHORE GRADIENTS WILL WEAKEN FOR DECREASING WINDS IN AND NEAR THE
MOUNTAINS THIS AFTERNOON AND EVENING. AN UPPER LEVEL RIDGE OF HIGH
PRESSURE IN THE ERN PAC WILL SLOWLY SHIFT E ONTO THE W COAST.
ONSHORE FLOW WITH SOME MARINE LAYER CLOUDS WILL BRIEFLY RETURN
TUESDAY NIGHT AND THEN DECREASE 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 ON 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. AN UPPER TROUGH WILL BE FOLLOWED BY FLAT WLY FLOW
BRINGING MORE HIGH CLOUDINESS AND COOLING SATURDAY AND SUNDAY.
ANOTHER TROUGH APPROACHING FROM THE W COULD BRING SHOWERS BY MONDAY.
&&
.AVIATION...
302000Z...ONLY AVIATION CONCERN IS WITH WINDS ALOFT. AREAS OF 30 KT
NORTH WINDS OVER THE RIDGES MAY RESULT IN MOUNTAIN WAVES AND UP AND
DOWN DRAFTS AT TIMES THROUGH THIS EVENING. LOCAL LLWS WILL BE
POSSIBLE...BUT WILL BECOME MORE ISOLATED BY LATE AFTERNOON.
OTHERWISE...VFR WITH UNRESTRICTED VIS THROUGH TONIGHT.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...NONE.
&&
$$
PUBLIC...ATKIN
AVIATION...JAD
