000 FXUS66 KLOX 041611 AFDLOX SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 900 AM PDT SAT JUL 4 2009 .SYNOPSIS... VERY LITTLE CHANGE EXPECTED OVER THE NEXT SEVEN DAYS AS DRY SOUTHWEST FLOW CONTINUES BETWEEN AN UPPER LOW TO THE NORTHWEST AND AN UPPER HIGH TO THE EAST. PERSISTENT COASTAL NIGHT THROUGH MORNING LOW CLOUD PATTERN WILL MOVE INTO THE VALLEYS EARLY NEXT WEEK AND PERSIST. && .SHORT TERM (TODAY-MON)... CURRENT SATELLITE IMAGERY SHOWING FAIRLY EXTENSIVE MARINE LAYER COVERAGE NORTH OF POINT CONCEPTION...AS 12Z VANDENBERG SOUNDING INDICATED A MARINE LAYER DEPTH SLIGHTLY OVER 2000 FEET. MEANWHILE... LOW CLOUDS AND FOG LESS EXTENSIVE SOUTH OF POINT CONCEPTION AS ACARS DATA SUGGESTS MARINE LAYER DEPTH JUST BELOW 1000 FEET. WITH FAIRLY HIGH 500 MB HEIGHTS OVER THE REGION...LOOK FOR STRONG AND FAIRLY LOW MARINE INVERSION TO REMAIN IN PLACE THE NEXT FEW DAYS. THE COMBINATION OF A LOW/STRONG MARINE INVERSION AND FAIRLY STRONG ONSHORE FLOW COULD RESULT IN SOME DIFFICULT AFTERNOON BURNOFF OF LOW CLOUDS ALONG SOME BEACHES ACROSS THE REGION TODAY AND TOMORROW. THIS WILL MAINTAIN MILD TEMPERATURE READINGS ALONG THE COASTAL PLAIN...WITH CONTINUED WARM AND DRY CONDITIONS IN THE VALLEYS...MOUNTAINS...AND DESERTS... WHERE TEMPERATURES INTO THE 90S WILL BE COMMON THROUGH THE WEEKEND. MODEL CROSS SECTIONS ALSO SHOWING SOME DRIER AIR MOVING INTO THE REGION AT HIGHER ELEVATIONS ON SUNDAY AND MONDAY. AS A RESULT... HEADLINES HAVE BEEN ISSUED IN FIRE WEATHER FORECAST FOR PERIODS OF SINGLE DIGIT HUMIDITIES IN THE MOUNTAINS AND ANTELOPE VALLEY EACH DAY. THIS IN COMBINATION WITH VERY WARM TEMPERATURES AND GUSTY ONSHORE WINDS EACH AFTERNOON AND EVENING WILL BRING HEIGHTENED FIRE WEATHER CONCERNS TO THOSE AREAS ON SUNDAY AND MONDAY. *** FROM PREVIOUS DISCUSSION *** .LONG TERM (TUE-FRI)... MDLS NOW CONSISTENT IN LIMITING THE AFFECTS OF THE UPPER TROF WHICH IN NOW FCST TO REMAIN FURTHER NORTH. WHILE ITS EFFECTS WILL STILL BE FELT BY THE MARINE LAYER WHICH WILL LIKELY RISE INTO THE VLYS THERE WILL NOT BE AS MUCH OVERALL COOLING. BUMPED UP TEMPS IN THE EXTENDED A FEW DEGREES AS A RESULT. THE FORECAST WILL REMAIN VERY STATIC THROUGH THE PERIOD. && .AVIATION...03/1915Z. PORTIONS OF THE COAST WILL BE DEALING WITH THE MARINE LEECH (LOW CLOUDS CLINGING TO THE COAST) THROUGH THE AFTERNOON...KLAX AND THE CENTRAL COAST ESPECIALLY. KLAX MAY SEE AN OCCASIONAL BKN SKY CONDITION THIS AFTERNOON AS COVERED IN THE TAF. THESE LOCATIONS WILL ALSO BE SUSCEPTIBLE TO AN EARLY RETURN OF THE IFR CONDITIONS ASSOCIATED WITH THE MARINE CLOUDS. PRETTY GOOD CONFIDENCE IN THE TAF PACKAGE. KLAX...GOOD CONFIDENCE IN SCT TO BKN CONDITIONS THIS AFTERNOON FOLLOWED BY BKN TO OVC CONDITIONS WITH IFR CEILINGS EARLY THIS EVENING THROUGH MUCH OF SATURDAY MORNING. KBUR...HIGH CONFIDENCE IN VFR CONDITIONS THROUGH SATURDAY. && .LOX WATCHES/WARNINGS/ADVISORIES... NONE && $$ PUBLIC...GOMBERG AVIATION...KAPLAN SYNOPSIS...BARTLING WWW.WEATHER.GOV/LOSANGELES