490 
FPUS66 KSAN 221009
AFDSAN

SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
330 AM PDT MON JUN 22 1998

                            ...SYNOPSIS...

WEAK ONSHORE FLOW AND THE MARINE LAYER WILL CONTINUE AREAS OF NIGHT
AND MORNING LOW CLOUDS AND LOCAL FOG WEST OF THE MOUNTAINS. LOCAL
GUSTY WINDS IN THE MOUNTAINS AND DESERTS AT TIMES. OTHERWISE...DRY
SOUTHWEST FLOW ALOFT WILL KEEP THE WEATHER FAIR WITH LITTLE
TEMPERATURE CHANGE. HIGH ASTRONOMICAL TIDES WILL CAUSE MINOR TIDAL
OVERFLOW AT LOW LYING COASTAL AREAS THROUGH WEDNESDAY.

                           ...DISCUSSION...
MARINE LAYER NOT AS EXTENSIVE THIS MORNING AS IT WAS YESTERDAY.
RAMSDIS FOG LOOP SHOWS STRATUS FIELD ACTUALLY MOVING OFF SHORE IN
SOME AREAS. KNKX VAD WINDS AT 2K FT HAVING EASTERLY COMPONENT. IN
ADDITION YESTERDAY 18Z MESO ETA RUN VALID THIS MORNING 10 METER WINDS
INDICATED NORTH TO NORTHEAST DIRECTION..WHICH SEEMS TO BE VERIFYING
FAIRLY WELL GIVEN MOVEMENT OF CLOUDS ON SATELLITE PICTURES. MESO ETA
IMPLIES FLOW WILL BECOME MORE ONSHORE AGAIN TONIGHT WITH RETURN OF
MORE EXTENSIVE MARINE BLANKET.   

COMPARISON OF INITIAL 500H WITH 48 HOUR PROGS SHOWS NOT MUCH CHANGE
AS MAPS COMPARE FAIRLY WELL. IN ADDITION..EXCELLENT AGREEMENT BETWEEN
FWC AND FAN THIS MORNING..NUMBERS IDENTICAL THROUGH 48 HRS. HAVE
UPDATED FORECASTS TO BACK OFF ON STRATUS LAYER THIS MORNING TO BE
MORE PATCHY BUT EXPECT IT TO RETURN AGAIN TONIGHT AND BE MORE
EXTENSIVE..THOUGH AREAS COASTAL SECTIONS STILL SEEMS BEST.
TEMPERATURES ABOUT THE SAME TODAY AND COOLER TUESDAY WITH MORE MARINE
INFLUENCE.   

EXTENDED HINTS THAT UPPER TROUGH MAY FINALLY LIFT OUT TO THE NORTH AS
HEIGHTS RISE OVER THE AREA. 

SAN UU 072/063 071/063 072 150000

CLARK