Forecast Discussions mentioning ACARS, received at FSL on 09/05/99

NO ZONE UPDATES PLANNED THIS EVENING.

LATEST ACARS AND PROFILER SOUNDINGS INDICATE THE MARINE LAYER HAS DROPPED DOWN TO 1000 TO 1500 FEET OVER THE DISTRICT THIS EVENING. LOW CLOUDS HAVE MOVED INTO THE CENTRAL COAST OF SLO/SBA COUNTY...WITH SOME LOW CLOUDS NOTED ALONG THE COAST OF VTU/LAX COUNTIES. W TO E ONSHORE GRADIENTS ARE WEAKER THAN 24 HOURS AGO. IN ADDITION...SOME OFFSHORE TRENDS WITH NE WINDS SHOWED UP IN THE ANTELOPE VALLEY THIS AFTERNOON. OVERALL...LOW CLOUDS SHOULD STAY CLOSER TO THE COAST OVERNIGHT WITH ONLY PATCHY LOW CLOUDS AND FOG EXPECTED FOR MOST OF THE VALLEYS.

00Z ETA/NGM IN BASIC AGREEMENT WITH ONLY SOME MINOR DIFFERENCES WITH LARGE SCALE FEATURES. BOTH INDICATE A WEAK UPPER TROF EXTENDING OFF THE SOCAL CST WILL DEVELOP INTO A WEAK UPPER LOW BY SUN THEN LINGER OFF THE CST THRU MON. AT THE SAME TIME AN UPPER LEVEL HI IS EXPECTED TO BUILD OVER NRN MEXICO INTO SRN ARIZONA AND NEW MEXICO. THE NGM IS FARTHER EAST WITH THE UPPER HI AND WITH THE UPPER LOW. EVEN WITH THE MINOR DIFFERENCES...BOTH MODELS CONTINUE TO SHOW WARMING IN THE BOUNDARY LAYER AND 850 MB THRU SUN AFTERNOON...THEN LITTLE CHANGE THRU MON AFTERNOON. DIURNAL ONSHORE/OFFSHORE TRENDS SHOULD CONTINUE THRU MON. SOUNDINGS SHOWED GOOD WARMING IN THE BOUNDARY LAYER UP TO 850 MB TODAY...WHICH WAS CONFIRMED WITH WARMER TEMPS OVER INLAND SECTIONS AND IN THE MOUNTAINS. LOOKS LIKE WARMER STILL FOR INLAND SECTIONS SUN THEN ABOUT THE SAME OR SLIGHTLY WARMER TEMPS MON. MARINE LAYER SHOULD CONTINUE TO INFLUENCE COASTAL AREAS TO KEEP TEMPS NEAR NORMAL THERE THRU THE PERIOD.

IN THE EXTENDED...SOCAL SHOULD REMAIN BETWEEN AN UPPER LOW OFF THE COAST AND AN UPPER HI OVER THE SRN ROCKIES. THIS WILL CONTINUE TO PREVENT ANY MONSOONAL MOISTURE FROM MOVING INTO THE REGION. LITTLE CHANGE EXPECTED TUE THRU THU WITH DRY WEATHER CONTINUING. MARINE LAYER CLOUDS WILL LINGER ALONG THE COAST AND INTO SOME OF THE VALLEYS DURING THE NIGHT AND MORNING HOURS...OTHERWISE EXPECT MOSTLY CLEAR SKIES WITH NEAR OR SLIGHTLY ABOVE NORMAL TEMPS.

LAX 0000. SIRARD.

.LAX...NONE.

LATEST SATELLITE/SURFACE OBS INDICATE STRATUS/FOG FORMING ALONG COASTAL ZONES. WITH ACARS DATA INDICATING BASE OF MARINE INVERSION AROUND 1300 FEET AND SOME LOW-LEVEL EASTERLY FLOW...DO NOT THINK MARINE LAYER WILL BE MUCH OF A PROBLEM FOR THE VALLEYS EXCEPT FOR SOME PATCHY LIGHT FOG. WITH SHALLOW MARINE LAYER AND WEAK ONSHORE FLOW...STRATUS/FOG SHOULD BURN AWAY NICELY BY THE AFTERNOON... ALLOWING FOR A SUNNY AFTERNOON ACROSS THE ENTIRE DISTRICT.

FOR THE FORECAST...MODELS ALL AGREE THAT LITTLE WILL CHANGE FOR THE NEXT COUPLE OF DAYS. UPPER HIGH WILL CONTINUE OVER NEW MEXICO WITH WEAK UPPER LOW OFF THE SOUTHERN CALIFORNIA COAST. AT SURFACE...WILL CONTINUE TO HAVE WEAK ONSHORE FLOW THROUGH MONDAY. END RESULT WILL BE TO KEEP MARINE LAYER CONFINED TO THE COASTAL ZONES. OTHERWISE... WILL CONTINUE TO HAVE CLEAR SKIES AS SOUTHWEST FLOW ALOFT KEEPS MONSOONAL MOISTURE FAR AWAY FROM THE SOUTHLAND.

AS FOR TEMPS...MODELS INDICATE SOME DECENT BOUNDARY LAYER WARMING TODAY...WITH LITTLE ADDITIONAL WARMING MONDAY. THERFORE...WILL EXPECT 3-5 DEGREES WARMING FOR VALLEYS/MOUNTAIN/DESERT AREAS TODAY WITH SLIGHTLY LESS WARMING FOR COASTAL ZONES. ON MONDAY...WILL EXPECT LITTLE CHANGE...WITH INLAND SECTIONS MAYBE WARMING A DEGREE OR TWO.

FOR EXTENDED...MODELS INDICATE LITTLE PATTERN CHANGE. THEREFORE... WILL EXPECT LITTLE FORECAST CHANGE...WITH CLEAR SKIES THROUGH THE PERIOD EXCEPT FOR SOME STRATUS/FOG ALONG THE COAST...AND LITTLE VARIATION IN TEMPS.

LAX 000. THOMPSON.

.LAX...NONE.