SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NWS LOS ANGELES/OXNARD CA
AFDLOX 915 PM PDT FRI JUL 16 1999
EVENING FOG PRODUCT IMAGES SHOW MARINE LAYER CLOUDS ALONG THE CENTRAL
COAST AND REMAINING GENERALLY OVER THE COASTAL WATERS SOUTH OF POINT
CONCEPTION WITH ONLY ONE SLIVER OF LOW CLOUDS MOVING INTO THE L.A.
COUNTY COAST NEAR TORRANCE. LATEST PROFILER/ACARS SOUNDINGS INDICATE
THE MARINE LAYER IS ONLY ABOUT 1K FT NEAR LAX...WHILE 00Z SOUNDINGS
FROM VBG SHOW 1500 FT AND FROM NKX 2000 FEET. WITH WINDS GUSTING TO
ABOUT 25 KT IN THE OUTER WATERS NEAR POINT CONCEPTION...A WEAK EDDY
MAY DEVELOP TONIGHT TO DEEPEN THE MARINE LAYER A TAD OVER THE L.A.
COUNTY COAST...SIMILAR TO LAST NIGHT. LOW CLOUDS SHOULD DEVELOP IN
MOST COASTAL AREAS OVERNIGHT. SOME VALLEYS SHOULD SEE LOW CLOUDS LATE.
00Z ETA/NGM CONTINUE TO ADVERTISE BROAD UPPER TROF ALONG THE W COAST
WITH ONLY MINOR CHANGES IN HEIGHTS/THICKNESSES THRU SUNDAY. TYPICAL
WEAK TO MODERATE DIURNAL ONSHORE GRADIENTS WILL PERSIST THRU THE
PERIOD AS WELL. TEMPS WILL BE SIMILAR THE NEXT TWO DAYS AS THEY WERE
TODAY. DRY SOUTHWEST FLOW ALOFT WILL PREVENT THE THREAT OF ANY
CONVECTIVE ACTIVITY OVER THE MOUNTAINS AND DESERTS...SO ASIDE FROM A
FEW AFTERNOON CLOUDS IN THE MOUNTAINS...SKIES WILL BE MOSTLY CLEAR
THERE THRU SUN. MARINE LAYTER CLOUDS WILL AGAIN MOVE INTO COASTAL AND
SOME VALLEY AREAS SATURDAY NIGHT AND SUNDAY MORNING...OTHERWISE SKIES
OVER THIS REGION WILL BE MOSTLY CLEAR THRU SUNDAY.
ZONE UPDATE WILL BE ISSUED BY 930 PM FOR MAINLY MINOR CHANGES TO
LOW CLOUD WORDING IN THE FIRST PERIOD FOR COASTAL ZONES. NO CHANGES TO
TEMPS AS THEY LOOK GOOD.
DURING EXTENDED PERIOD...UPPER TROUGH WILL REMAIN OVER WEST COAST
WITH ONSHORE FLOW PREVAILING. THE MRF INDICATES SOME MID LEVEL
MOISTURE SHOUD MOVE INTO SOCAL FROM THE SOUTHWEST...BUT WITH WINDS
REMAINING GENERALLY SOUTHWEST OVER THE REGION...MONSOONAL MOISTURE
SHOULD BE HELD IN CHECK FOR NOW. THE USUAL COASTAL LOW CLOUDS SHOULD
MOVE IN DURING THE NIGHT AND MORNING...OTHERWISE DRY WEATHER WITH
SEASONABLE TEMPS IS EXPECTED ACROSS SOCAL MON THRU WED.
LAX 0000. SIRARD
.LAX...SMALL CRAFT ADVISORY....SEE LAXCWFLAX.
EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSAN 800 PM PDT FRI JUL 16 1999
...SYNOPSIS...
A WEAK UPPER TROUGH ALONG THE WEST COAST WILL BRING DRY SOUTHWEST
FLOW ALOFT AND WEAK ONSHORE LOW LEVEL FLOW FOR SOUTHERN CALIFORNIA
THROUGH THE WEEKEND. SKIES SHOULD BE CLEAR IN THE MOUNTAINS AND
DESERTS EXPECT FOR A FEW AFTERNOON CLOUDS. NIGHT AND MORNING LOW
CLOUDS ALONG THE COAST...EXTENDING LOCALLY INTO THE VALLEYS...WILL
CLEAR BY MID MORNING EACH DAY. SEASONAL WARM TO HOT TEMPERATURES
WILL CONTINUE IN ALL AREAS.
...DISCUSSION...
CURRENT FORECAST ON TRACK WITH NO UPDATES PLANNED THIS EVENING.
QUIET WEATHER PATTERN SHOULD CONTINUE THRU THE WEEKEND INTO NEXT
WEEK AS A WK UPR TROUGH REMAINS ALG THE W CST WITH DRY SWLY FLOW ALF
AND WK ONSHR LOW LVL FLOW FOR SRN CA. SWLY FLOW ALF SHOULD KP MOST
MONSOONAL MSTR TO THE E OF SRN CA FOR A FEW AFTERNOON CU...AT
MOST...OVR THE MTNS AND DESERTS EACH DAY. EVENING ACARS SOUNDINGS
AND RAOBS SHOW THE BASE OF THE MARINE INVERSION JUST UNDER 1000 FT
SRN LOS ANGELES COUNTY... BETWEEN 1000 AND 1500 FT ORANGE COUNTY...
AND AROUND 1500 FT SAN COUNTY. THIS IS SLIGHTLY LWR THAN 24 HOURS.
SOME ADDITIONAL LWRG/STRENGTHENING OF THE MARINE INVERSION IS LIKELY
DURG THE WEEKEND AS THE TROUGH ALG THE W CST WKNS AND HEIGHTS OVR
SRN CA BUILD SLIGHTLY. THIS SHOULD RESULT IN CSTL LOW CLOUDS BEING
CONFINED CLOSER TO THE CST EACH NIGHT/MORNING THRU THE WEEKEND WITH RAPID
CLEARING EACH MORNING.
SAN 0000
.SAN...NONE.
MARTIN