FXUS66 KSGX 242048
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
100 PM 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. A FEW SPOTS HAD WIND GUSTS OVER 20 MPH...WITH FREMONT CANYON 
HAVING A GUST OF 33 MPH AROUND 8 AM. TODAY...TEMPS WERE MOSTLY 5-10 
DEG F HIGHER THAN WED...EXCEPT FOR THE IMMEDIATE COAST WHERE LITTLE 
TEMP RISE OCCURRED. TEMPS WILL NOT BE QUITE AS LOW TONIGHT AS LAST 
NIGHT...PARTLY DUE TO SOME HIGH CLOUDS...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.

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 AROUND 1/10"...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. DUE 
TO THE RATHER DEEP SURFACE LOW...AT LEAST WHILE THE SYSTEM IS OUT TO 
SEA...STRONG WINDS AT SEA COULD GENERATE SOME SWELL WHICH WOULD 
RESULT IN MODERATE TO HIGH SURF AROUND MONDAY AT OUR BEACHES. 

WEAK-MODERATE RIDGING WILL FOLLOW THE LOW FOR SOME 
WARMING...POSSIBLY TO NEAR SEASONAL NORMS. THE SLIGHT CHANCE OF 
PRECIP IN THE FORECAST FOR WED WILL BE REMOVED IN THE AFTERNOON 
PACKAGE.

&&

.AVIATION...
242015Z...EXCEPT FOR CIRRUS AT OR ABOVE FL250 A MOSTLY CLEAR SKY 
WITH 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