Forecast Discussions mentioning ACARS, received at FSL on 06/29/99

SATELLITE IMAGERY INDICATING LOW CLOUDS/FOG RETURNING TO MOST COASTAL AREAS THIS EVENING. LATEST ACARS SOUNDING AND USC PROFILER INDICATING MARINE LAYER DEPTH BETWEEN 1000 AND 1200 FEET. MODERATE ONSHORE GRADIENTS MAY ENABLE SOME PATCHY LOW CLOUDS/DENSE FOG INTO LOWER COASTAL VALLEYS LATER TONIGHT BUT SHOULD BURN OFF QUICKLY TUESDAY MORNING INLAND.

USC PROFILER SHOWING CONSIDERABLE WARMING ABOVE 1500 FEET THIS EVENING...AS COMPARED TO 24 HOURS AGO. THIS SHOULD BE INDICATIVE OF ADDITIONAL WARMING FOR ALL VALLEY...MOUNTAIN...AND DESERT AREAS ON TUESDAY. ADDITIONAL WARMING EXPECTED ON WEDNESDAY FOR INLAND AREAS AS MODELS DETECT SOME WARMING IN BOUNDARY LAYER. IN FACT...BY WEDNESDAY...WARMER VALLEY AREAS LIKE WOODLAND HILLS SHOULD APPROACH 100 DEGREES.

AS MARINE INVERSION CONTINUES TO LOWER AND STRENGTHEN...COULD SEE LOCALLY DENSE FOG ACROSS SOME AREAS DURING THE NIGHT AND MORNING HOURS. DENSE FOG ADVISORY MAY BE NEEDED ONCE AGAIN FOR CENTRAL COAST LATER TONIGHT. DUE TO LOW AND STRONG MARINE INVERSION...MANY BEACH AREAS MAY ONCE AGAIN SEE ONLY PARTIAL CLEARING IF ANY. AS A RESULT...IMMEDIATE COAST NOT LIKELY TO SEE MUCH CHANGE IN TEMPERATURES NEXT COUPLE OF DAYS DUE TO THIS MARINE INFLUENCE.

EXTENDED PERIOD SHOWING VERY WARM DAYS ACROSS INLAND AREAS THROUGH FRIDAY. SOME COOLING EXPECTED BY SATURDAY AS UPPER TROUGH MOVES INTO NORTHERN CALIFORNIA AND SURFACE ONSHORE FLOW INCREASES ACROSS SOUTHERN CALIFORNIA.

LAX 0000. GOMBERG

.LAX...NONE.

...SYNOPSIS... BUILDING HIGH PRESSURE ALOFT AND WEAKER ONSHORE FLOW WILL BRING WARMER WEATHER INTO MID-WEEK. NIGHT AND MORNING LOW CLOUDS WILL BE LESS WIDESPREAD ALONG THE COAST THE NEXT FEW DAYS...BUT THE FOG COULD BE LOCALLY DENSE.

...DISCUSSION... CURRENT FORECASTS LOOK OKAY BASED ON LATEST OBSERVATIONS...TRENDS AND MODEL GUIDANCE. THE 29/00Z SOUNDING FROM KNKX SHOWED THE INVERSION NEAR 1500 FT...ABOUT 500 FEET LOWER THAN PREVIOUS DAY...AND ACARS DATA AT 02Z INDICATED IT WAS DOWN TO 1100 FT OVER KLGB. THICKNESSES INCREASE ABOUT 20 METERS DURING NEXT 24 HOURS. BOTH OF THESE SUPPORT MENTION OF DENSE FOG COASTS AND SAN DIEGO VALLEYS AS WELL AS WARMER DAYTIME TEMPERATURES. ALL THE MODELS BUILD THE RIDGE ALOFT AND TURN THE 1000-700 MB WINDS BACK TO THE WEST AND NORTHWEST...ALTHOUGH THE ETA IS ABOUT 24 HOURS SLOWER AND KEEPS THE COL BETWEEN THE NORTHWEST FLOW AND THE SOUTHEAST FLOW LINGERING OVER THE DESERTS AND MOUNTAINS OF NWSO SAN DIEGO COUNTY WARNING AREA THROUGH 30/00Z. AS LONG AS RIDGE ALOFT HOLDS THIS SHOULD PROVIDE STABILITY/CAP TO ANY VERTICAL GROWTH OF CLOUDS. CURRENT FORECASTS HAVE MENTION OF SOME AFTERNOON CLOUDS AND SHOULD SUFFICE FOR NOW.

SAN 0000

.SAN...NONE.

BALFOUR

...CORRECTED DAY AND DATE...

SAT PIX AND SFC OBS INDICATE LOW CLOUDS HAVE SPREAD INTO MST CSTL AREAS EARLY THIS MORNING...BUT HAVE YET TO INFILTRATE ACARS SOUNDINGS AND PROFILER DATA SUGGESTS THAT THE MARINE LYR DEPTH IS BETWEEN 1000 AND 1300 FEET...MORE SHALLOW THAN 24 HRS AGO. MARINE LYR IS PROBABLY STILL DEEP ENOUGH TO ALLOW AT LEAST PATCHY LOW CLDS/FOG TO PUSH INTO LOWER VLY LOCATIONS...ESPECIALLY GIVEN THAT ONSHR GRADS REMAIN MDT. THE FOG WAS ALREADY LCLLY DENSE ACRS PARTS OF WRN SBA COUNTY AND WITH MARINE INVERSION CONTG TO LOWER...BLV DENSE FOG WL BECOME MORE WDSPRD. WL ISSUE A DENSE FOG ADVISORY AT LEAST FOR CSTL SXNS OF SLO AND WRN SBA COUNTIES THIS MORNING.

FLAT BUT STG UPR RIDGE WAS NOSING INTO SRN CA FROM THE PAC... AND ASSOCD SUBSIDENCE HAS CAUSED MARINE LYR TO BECOME INCRGLY SHALLOW. PROFILER DATA AND SFC OBS FROM THE MORE ELEVATED REPORTING STATION SHOW CONSIDERABLE WARMING HAS OCCURRED ABOVE 1500 FEET DURING THE PAST 24 HRS. INLAND AREAS WILL CONT TO SLOWLY WARM EACH OF THE NEXT TWO DAYS DUE TO RISING THICKNESSES...AND INCRSG H85 AND BOUNDARY LYR TEMPS. MORE SUBSTANTIAL WARMING WILL OCCUR IN THE VLYS ONCE THE MARINE INVERSION LOWERS ENOUGH TO CAUSE A SHARP REDUCTION OF THE MARINE INFLUENCE IN THE VLYS. THIS WILL PROBABLY OCCUR TODAY...ALTHOUGH MAY WAIT UNTIL WED... ESPECIALLY IN LOWER VLY LOCATIONS. ON THE CSTL PLAIN...DECENT ONSHR GRADS WILL TEMPER WARMING SOMEWHAT...ESPECIALLY NEAR THE CST WHERE TEMPS SHOULD CHG LTL OF THE NEXT COUPLE OF DAYS. STRENGTHENING AND LOWERING INVERSION COULD KEEP CLOUDS FAIRLY STUBBORN IN IMDT CSTL AREAS WELL INTO THE AFTERNOON HOURS TODAY AND WED.

LOW LVL OUTFLOW FROM A LARGE TSTORM COMPLEX WHICH DEVELOPED ACRS AZ LAST EVENING HAS PUSHED LOW LVL MSTR WWD INTO THE SRN CA DSRTS AND DEW POINTS HAVE RISEN SHARPLY...INTO THE LOWER 70S. WATER VAPOR INDICATES A WWD DRIFT OF THE UPR LVL MSTR ACRS XTRM SRN CA ATTM. HOWEVER.,.ALL MODELS MAINTAIN AT LEAST WK WLY TO NWLY FLOW ALF OVR THE FCST AREA WHICH SHOULD KEEP MSTR SUPPRESSED TO THE S OF THE FCST AREA.

FOR THE EXTENDED...UPR RIDGE WL HOLD STRONG THROUGH THU WITH HIGH HGTS AND ABOVE NORMAL TEMPS CONTG. AS UPR TROUGH DEVELOPS ACRS THE PAC NW FRI AND SAT HEIGHTS ACRS SRN CA WILL SLWOLY LOWER AND XPCT SOME GRADUAL COOLING BY SAT.

LAX 000. BRUNO.

.LAX...DENSE FOG ADVISORY...SEE LAXNPWLAX.