FXUS66 KSGX 241727
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 AM PST THU DEC 24 2009

.SYNOPSIS...FAIR WEATHER WILL CONTINUE THROUGH SATURDAY AS WEAK HIGH 
PRESSURE ALOFT CONTINUES...THOUGH OCCASIONAL HIGH CLOUDS WILL DRIFT 
OVER. A PACIFIC WEATHER SYSTEM WILL APPROACH BUT MOST LIKELY MOVE 
THROUGH BAJA CALIFORNIA EARLY NEXT WEEK. THIS WILL BRING A CHANCE OF 
SHOWERS...MAINLY SUNDAY NIGHT AND MONDAY. FAIR WEATHER WILL RETURN 
BY TUESDAY. TEMPERATURES WILL AVERAGE A LITTLE BELOW SEASONAL NORMS 
FOR THE NEXT 7 DAYS.

&&

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

SKIES WERE MOSTLY CLEAR THIS MORNING. A FEW OF THE NORMALLY COLDER 
VALLEYS HAD TEMPS IN THE UPPER 20S THIS MORNING...SUCH AS CORONA AND 
RAMONA. TEMPS WILL WARM SLIGHTLY TODAY/TONIGHT...THOUGH STILL A BIT 
BELOW SEASONAL NORMS. SOME INLAND VALLEYS WILL AGAIN HAVE FROST 
OVERNIGHT...BUT ONLY IN AREAS THAT NORMALLY HAVE IT MULTIPLE TIMES 
EACH WINTER. SOME HIGH CLOUDS COULD MODERATE THE LOW TEMPS SLIGHTLY.

BROAD UPPER LOW COVERS A GOOD CHUNK OF THE MID-NE PAC...CENTERED 
AROUND 48N/160W...AND ACCOMPANIED BY A DEEP 963 MB SURFACE LOW. A 
WAVE...ACCOMPANIED BY WHAT WILL BE INITIALLY A 150+ KNOT JET 
STREAK...WILL MOVE EAST ALONG THE SOUTH SIDE OF THE LOW AND WILL 
APPROACH CALIFORNIA ON SUNDAY. THE PRECIP CURRENTLY IN THE FORECAST 
FOR LATE SATURDAY NIGHT AND AT LEAST SUNDAY MORNING WILL BE REMOVED 
AS THE LOW WILL NOT BE CLOSE ENOUGH YET...ESPECIALLY WITH THE JET 
STREAK WEAKENING WITH TIME. THE TRACK OF THE LOW ASSOCIATED WITH THE 
WAVE WILL MOST LIKELY BE JUST TO OUR SOUTH...AND THIS WILL MOST 
LIKELY KEEP PRECIP AMOUNTS LOW OVER OUR AREA. PRELIMINARY ESTIMATES 
ARE FOR 1/4"...WITH GREATEST AMOUNTS IN SAN DIEGO COUNTY...BUT 
DEPENDING ON THE TRACK OF THE SYSTEM...THERE IS A POSSIBILITY THAT 
NO PRECIP WILL FALL. IF PRECIP OCCURS...SNOW LEVELS WOULD PROBABLY 
BE IN THE 4000-5000' RANGE DUE TO THE COLD CORE BEING NEARBY AND 850 
MB TEMPS OF 3C OR LOWER. BEST CHANCES ARE SUNDAY NIGHT/MONDAY. 
WEAK-MODERATE RIDGING WILL FOLLOW THE LOW FOR SOME 
WARMING...POSSIBLY TO NEAR SEASONAL NORMS.

&&

.AVIATION...
241400Z...MOSTLY CLEAR SKIES AND UNRESTRICTED VISIBILITIES WILL 
CONTINUE THROUGH FRIDAY. LOCAL GUSTY NORTHEAST WINDS WILL OCCUR 
BELOW PASSES AND CANYONS IN THE MORNINGS. 

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

PUBLIC...MAXWELL
AVIATION...HORTON