EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSAN 315 AM PST TUE FEB 26 2002
.SYNOPSIS...HIGH PRESSURE ALOFT WILL REMAIN ALONG THE WEST COAST
THROUGH THE WEEKEND WITH SURFACE HIGH PRESSURE OVER THE GREAT BASIN.
DRY WEATHER WILL CONTINUE WITH ALTERNATING PERIODS OF WEAK OFFSHORE
FLOW AND GREATER NIGHT AND MORNING COVERAGE OF COASTAL LOW CLOUDS.
TEMPERATURES WILL REMAIN WARM INLAND FROM THE BEACHES.
.DISCUSSION...PERSISTENT LONGWAVE PATTERN WITH UPR RDG ALG THE W CST
AND UPR TROUGH OVR THE CNTRL STATES WL CONTINUE INTO EARLY NEXT WEEK
WITH OCCASIONAL PDS OF GENERALLY WK OFSHR FLOW FOR SW CA. MDLS ARE
TRENDING WKR WITH THE OFFSHORE FLOW FOR TODAY...SO WIND WORDING HAS
BEEN TRIMMED BACK A LTL. ETA SHOWS A WK CSTL EDDY THIS MORNING...A
WKR CSTL EDDY TONIGHT INTO WED MORNING...AND A STRONGER EDDY FOR WED
NIGHT INTO THU MORNING. ACARS SOUNDINGS SHOWED THE TOP OF A STRONG
MARINE INVERSION NR 1000 FT WITH THE BASE BLO 500 FT. COMBINATION OF
THE STRONG MARINE INVERSION AND WK CSTL EDDY ARE FAVORABLE FOR AREAS
OF DENSE FM THE CST INLAND TO THE MESAS. DENSE FOG HAS CLRD BACK TO
NR THE CST DURG THE PAST 2 HOURS. HOWEVER...WL RETAIN THE DENSE FOG
ADV FOR NOW AS SOME RETURN OF DENSE FOG INLAND FM THE BEACHES IS
LIKELY THRU SUNRISE. AFTER SUNRISE...THE ETA CLRS THE FOG BACK TO
THE CST DURG THE MORNING.
CONDITIONS SHOULD BE SIMILAR TONIGHT...EXCEPT FOG MAY BE A LTL LATER
DEVELOPING ALG THE SAN COUNTY CST AND SPREADING NORTHWARD INTO
ORANGE COUNTY. WITH STRONGER EDDY WED NIGHT AND MINOR WKNG OF THE
RDG ALF...SOME MINOR DEEPENING OF THE MARINE LYR MAY OCCUR...TO
AROUND 1200 TO 1500 FT FOR A LTL GREATER STRATUS COVERAGE INTO THE
LWR SAN DIEGO COUNTY VLYS AND IMPROVED VISIBILITIES ALG THE CST FOR
WED NIGHT INTO THU MORNING. AVN STILL SHOWS A DECENT AREA OF MID AND
HIGH LVL MSTR FOR WED AND THU...COVERED WITH PARTLY CLOUDY WORDING
IN THE FORECAST. THERE WL LIKELY BE SOME DAY TO DAY DIFFERENCES IN
THE EXTENDED WITH MDL GUIDANCE NOT LIKELY TO LATCH ONTO THE
DETAILS...GENERALLY SOME FLUCTUATION BETWEEN WK OFSHR FLOW AND MINOR
MARINE INTRUSIONS WITH WARM TEMPERATURES INLAND FM THE CST.
.SAN...DENSE FOG ADVISORY...SEE LAXNPWSAN.
MARTIN