SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NWS LOS ANGELES/OXNARD CA
AFDLOX 300 AM PDT SUN AUG 29 1999
SAT PIX INDICATE LOW CLOUDS WDSPRD ACRS THE CENTRAL CST OF SLO AND
SBA COUNTIES...WITH A WK EDDY CRCLN ACRS THE INNER CSTL WATERS ALREADY
SPRDG SOME LOW CLDS AND FOG ACRS THE L.A. CNTY CSTL PLAIN INTO VTU
AND SRN SBA CNTY. MARINE INVERSION HAS DEEPENED SLGTLY DURING THE PAST
24 HRS...AND THAT WAS ENOUGH TO COOL MANY AREAS ON THE CSTL PLAIN A
FEW DEGS ON SAT. STG INVERSION WAS RESPONSIBLE FOR KEEPING LOW CLDS
RATHER TOUGH ALG SOME IMDT BEACH AREAS ON SAT. THE SLGT RISE IN THE
INVERSION WL PROBABLY BE ENOUGH TO KEEP DENSE FOG FROM BECOMING
WDSPRD IN CSTL AREAS THIS MORNING. AND...ALTHOUGH THE INVERSION
HAS WKND SOMEWHAT...SOME IMDT CSTL AREAS MAY AGAIN HAVE DIFFICULTY
CLRG UNTIL EARLY AFTERNOON...AS ETA HINTS AT WK SLY FLOW AND HIGHER
RH VALUES LINGERING ALG CSTL PORTIONS OF L.A....VTU AND SRN SBA
COUNTIES INTO EARLY AFTERNOON. ACARS...PROFILER DATA...AND SFC OBS
INDICATE THAT SOME COOLING HAS TAKEN PLACE UP TO 1500 FT...AND DESPITE
THE FACT THAT THICKNESSES AND H85 TEMPS CHG LTL FROM SAT...BLV MOST
VLY AREAS WILL BEGIN TO SEE SOME COOLING TODAY AS MARINE INFLUENCE
RETURNS THERE...AND HAVE LOWERED FCST TEMPS BY SEVERAL DEGS.
MDLS IN VERY GOOD AGREEMENT WITH OVERALL UPR LVL PATTERN...SHOWING RDG
HOLDING ACRS SRN CA TODAY...THEN BEING FLATTENED AND PUSHED EWD AS
FAIRLY SIGNIFICANT TROUGH PUSHES INTO THE PAC NW TONIGHT AND MON. MID
AND HIGH LVL MSTR MOVG W FROM THE DSRTS HAS BEEN HANDLED POORLY BY THE
MDLS THIS PAST WEEK...WITH MDLS ALTERNATING BETWEEN OVERFORECASTING AND
UNDERFORECASTING THE AMT OF MSTR WORKING WWD INTO THE FCST AREA. WITH
MID AND UPR LVL FLOW TRYING TO TURN SELY BRIEFLY TODAY BEFORE UPR
TROUGH PUSHES INTO W CST...THERE IS STILL A SLGT THREAT FOR CONVECTION
TODAY ACRS THE MTNS IN THE ERN PART OF THE FCST AREA. AS UPR TROUGH
APCHS W CST AND HGTS AND THICKNESSES BEGIN TO FALL ACRS SRN CA TONIGHT
AND MON...MARINE LYR WILL CONTINUE TO DEEPEN...ASSISTED BY DVLPMNT OF
A STRONGER EDDY CRCLN. ALL AREAS ARE XPCTD TO COOL A FEW DEGS ON MON...
WITH THE MOST COOLING...AS MUCH AS 10 DEGS OR MORE LIKELY ACRS THE
FARTHEST INLAND VLY LOCATIONS WHICH REMAIN QUITE HOT TODAY.
FOR THE EXTENDED...TROUGH WL CONT TO LINGER ACRS THE WRN STATES THRU
MIDWEEK...SO XPCT FAIRLY DEEP MARINE LYR...WDSPRD NIGHT THRU MORNING
LOW CLDS AND TEMPS AT OR SOMEWHAT BELOW NORMAL. STBL SWLY FLOW SHOULD
KEEP MONSOONAL MSTR WELL TO OUR E THROUGH MUCH OF NEXT WEEK.
LAX 000. BRUNO.
.LAX...SMALL CRAFT ADVISORY...SEE LAXCWFLAX.