000 
FXUS66 KSGX 011634
AFDSAN

EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 AM PDT WED MAY 1 2002

.SYNOPSIS...UPPER LEVEL LOW PRESSURE WILL BRING MOSTLY CLOUDY SKIES
TONIGHT AND THURSDAY MORNING WITH A FEW SPRINKLES POSSIBLE...MAINLY WEST
OF THE MOUNTAINS. THE MARINE LAYER AND ONSHORE FLOW WILL CAUSE NIGHT AND
MORNING COASTAL LOW CLOUDS...OTHERWISE FAIR AND WARMER THURSDAY INTO THE
WEEKEND. COOLER WITH MORE CLOUDS EARLY NEXT WEEK. 

.DISCUSSION...SCT CLOUDS W OF MOUNTAINS EXCEPT BKN NEAR FOOTHILLS AND
BAND OF HI CLOUDS STREAMING OVER SRN ZONES THIS AM. 12Z NKX SOUNDING HAD
ABOUT 6000 FT KEEP LOW LEVEL MOIST LAYER WITH STRONG WSW WINDS ALOFT.
ONSHORE GRADIENTS WITH ABOUT 5 MB SAN-IPL. 

FAIRLY STRONG VORT MAX ROTATES THROUGH TROUGH LATE TONIGHT/THU AM AND
CANNOT RULE OUT SMALL AMOUNTS OF PRECIP...WITH A SLIGHTLY BETTER CHANCE
IN SBD/RIV MOUNTAINS. POSSIBLE WEAK EDDY TONIGHT...HOWEVER COOL AIR
ALOFT WILL KEEP MARINE LAYER BROKEN UP. BREEZY TO WINDY IN THE MOUNTAINS
AND DESERTS THIS EVE...DECREASING OVERNIGHT. PC THU AFTERNOON AND A
LITTLE WARMER AS HEIGHTS BEGIN TO INCREASE. MARINE LAYER SHOULD REFORM
LOWER THU NIGHT/FRI AM. CONTINUED WEAK CYCLONIC FLOW ALOFT AND ONSHORE
FLOW FRI/SAT WITH GRADUALLY INCREASING HEIGHTS. SO EXPECT NIGHT AND
MORNING LOW CLOUDS W OF MOUNTAINS...OTHERWISE FAIR WITH WARMING TREND IN
MOST AREAS FRI/SAT BUT NOT A LOT OF ADDITIONAL WARMING NEAR THE COAST. 

LONGER RANGE PROGS INDICATE LITTLE CHANGE SUN. TROUGH DEEPENS OVER THE
W FOR MORE CLOUDS/COOLING MON INTO WED. 

.SAN...SMALL CRAFT ADVISORY...SEE LAXCWFSGX.

ATKIN