FXUS66 KSGX 301056
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
300 AM PST MON NOV 30 2009
.SYNOPSIS...HIGH PRESSURE ALOFT WILL CONTINUE OVER THE AREA WITH
MINOR FLUCTUATIONS THROUGH FRIDAY. HIGH PRESSURE ALOFT WILL WEAKEN
DURING THE WEEKEND. AN OFFSHORE FLOW TODAY WITH GUSTY NORTHEAST
WINDS OVER THE MOUNTAINS AND INLAND VALLEYS WILL WEAKEN THIS
AFTERNOON. NIGHT AND MORNING FOG AND LOW CLOUDS MAY DEVELOP TUESDAY
MORNING AND CONTINUE THROUGH WEDNESDAY MORNING IN THE COASTAL AREAS.
&&
.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
HIGH PRESSURE ALOFT INCREASES OVER SOCAL TODAY...THEN WEAKENS A BIT
TUESDAY...THEN THE RIDGE SLOWLY INCREASES THROUGH THURSDAY...
WEAKENING SLIGHTLY FRIDAY. OFFSHORE FLOW TODAY WITH STRONG NORTHEAST
WINDS ALOFT WILL CAUSE STRONG GUSTY NORTHEAST WINDS OVER THE
MOUNTAINS AND INLAND VALLEYS THIS MORNING...WEAKENING AFTERNOON. A
COASTAL EDDY IS FORECAST TO DEVELOP TONIGHT THROUGH TUESDAY. SOME
FOG AND LOW CLOUDS ARE EXPECTED ALONG THE SAN DIEGO COUNTY COAST BY
TUESDAY MORNING WITH POSSIBLE DENSE FOG. THE FOG AND LOW CLOUDS ARE
EXPECTED TO INCREASE AND COVER THE COASTAL AREAS TO ORANGE COUNTY BY
WEDNESDAY MORNING. AN OFFSHORE FLOW IS FORECAST FOR THURSDAY MORNING
TO FORCE THE LOW CLOUDS AND FOG OUT OF THE AREA. A LARGE TROUGH AND
LOW PRESSURE SYSTEM IS FORECAST TO DEVELOP OVER THE WESTERN STATES
DURING THE WEEKEND. BOTH ECMWF AND GFS MODELS ARE SOMEWHAT SIMILAR
IN THAT THEY BRING A GOOD AMOUNT OF RAIN TO THE AREA. THE GFS MODEL
BRINGS PRECIPITATION IN EARLIER...AROUND SUNDAY...BUT THE ECMWF
BRINGS THE RAIN TO SOCAL MONDAY. THE ECMWF SEEMS MORE PLAUSIBLE AND
THE FORECAST IS HEADED IN THAT DIRECTION.
&&
.AVIATION...
300920Z...ASIDE FROM SCATTERED STRATOCUMULUS AND ALTOCUMULUS OVER
ANZA BORREGO DESERT AND MOUNTAINS SOUTH OF MOUNT SAN JACINTO MOVING
SOUTH-SOUTHWEST AROUND THE LOW CENTERED OVER SONORA SKIES ARE CLEAR.
NORTHEAST WINDS OF 30-40 KT IN THE FL030-FL150 LAYER ALSO CAUSING
MODERATE TURBULENCE TO THE WEST AND SOUTHWEST OF THE MOUNTAINS. BOTH
CLOUDS AND WINDS WILL BE DIMINISHING AFTER 1800 UTC AS LOW MOVES
FURTHER SOUTH AND EAST. ALONG THE IMMEDIATE COAST AND OVER WATER
BELOW FL001 VISIBILITY 5-6SM IN HAZE. THOUGH NE WINDS WILL BE
DIMINISHING LINGERING DRY AIR MASS SHOULD KEEP STRATUS FROM
REFORMING NEAR COAST AREAS THROUGH 01/1600 UTC.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...WIND ADVISORY FOR THE SAN BERNARDINO MOUNTAINS...THE SANTA ANA
MOUNTAINS AND THE INLAND EMPIRE UNTIL 2 PM.
&&
$$
PUBLIC...WHITLOW
AVIATION/MARINE...BALFOUR
