FXUS66 KSGX 152133
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 PM PST TUE DEC 15 2009
.SYNOPSIS...HIGH PRESSURE ALOFT AND PERIODS OF WEAK OFFSHORE FLOW
WILL BRING FAIR WEATHER WITH VARIABLE HIGH CLOUDINESS. WARMER INTO
THE END OF THE WEEK.
&&
.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
.SHORT TERM (REMAINDER OF TODAY-FRIDAY)...VARIABLE HIGH CLOUDINESS
TODAY. EARLY AFTERNOON AIRCRAFT SOUNDINGS SHOWED INCREASING W TO NW
WINDS ABOVE 10000 FT. OFFSHORE GRADIENTS WITH ABOUT -7 MB SAN-TPH.
THERE WAS PATCHY GROUND FOG INLAND THIS MORNING...BUT DRYING TODAY
WILL MAKE IT EVEN MORE ISOLATED TONIGHT. A SHORT WAVE TROUGH MOVING
PAST TO THE N WILL FLATTEN THE UPPER RIDGE THROUGH WEDNESDAY.
ANOTHER RIDGE OF HIGH PRESSURE WILL BUILD THURSDAY AND FRIDAY. THE
PASSING SHORT WAVE WILL CAUSE ENOUGH HIGH CLOUDINESS THROUGH
WEDNESDAY FOR PARTLY CLOUDY SKIES. THE HIGH CLOUDS WILL DECREASE
THURSDAY AND FRIDAY. A SURFACE HIGH OVER THE INTERIOR WILL WEAKEN
THROUGH WEDNESDAY AND THEN ANOTHER WILL DEVELOP THURSDAY AND FRIDAY.
THIS WILL CAUSE INTERMITTENT...MAINLY GRADIENT DRIVEN...OFFSHORE
FLOW. OFFSHORE WINDS ARE NOT EXPECTED TO REACH ADVISORY STRENGTH
WITH MOST GUSTS LESS THAN 30 MPH THROUGH AND BELOW MOUNTAIN CANYONS
AND PASSES AT TIME. HOWEVER...THERE COULD BE BRIEF STRONGER ISOLATED
GUSTS. THE RIDGING ALOFT AND OFFSHORE FLOW WILL BRING WARMER
DAYS...ESPECIALLY W OF THE MOUNTAINS. FRIDAY SHOULD BE THE WARMEST
DAY IN MOST AREAS WITH MAX TEMPS GETTING CLOSE TO 80 DEGREES IN THE
WARMER INLAND AREAS.
&&
.LONG TERM (SATURDAY-TUESDAY)...ANOTHER SHORT WAVE WILL BREAK DOWN
THE RIDGE BY EARLY NEXT WEEK. THIS WILL BRING A COOLING TREND WITH
MORE HIGH CLOUDINESS. A DIURNAL WIND PATTERN WILL PREVAIL WITH WEAK
OFFSHORE FLOW AT NIGHT AND ONSHORE FLOW DURING THE AFTERNOONS.
&&
.AVIATION...
152010Z...BROKEN CIRROSTRATUS AOA FL200 THROUGH NEXT 18 HOURS AS
UPPER RIDGE FLATTENS WITH EAST WINDS 10-15KT BELOW FL100. ONLY
VISIBILITY RESTRICTIONS SHOULD BE FROM PATCHY GROUND FOG WITHIN 500
FT AGL IN VALLEYS BETWEEN 0300-1700 UTC.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...NONE.
&&
$$
PUBLIC...ATKIN
AVIATION...BALFOUR
