SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NWS LOS ANGELES/OXNARD CA
AFDLOX 845 AM PDT THU JUN 24 1999
IN LAST 24 HRS SFC PRES FALLS HV SPRD ACRS PAC NW THEN SEWD INTO PLTO
RGN WITH RESULTG ONSHR TREND IN PRES GRADS OVR DIST. LAX TO DAG UP TO
5 MB ATTM. ACCORDG TO MRNG SOUNDGS MARINE LYR CNTRL CST PTNS HAS DPND
TO ABT 2 THSD FT WHILE SRN CA INVRN STILL BASED ABT 15 HND FT. RAMSDIS
SHOWS CNTL CA CSTL ZONES COMPLETELY COVERED BY ST/FG THIS MRNG WHILE
SRN CA A LTL MR EXTNSV MARINE LYR CLDS AND FG...EXTDG INTO ERN LA CNTY
VLYS AND WDSPRD VTU CSTL VLYS. SO AFTN TEMPS SHUD BE DOWN A LTL TDA...
PERHAPS 2 TO 5 DEGS...W OF MTNS. TKNS ABT THE SAME THIS MRNG...AND NOT
XPCD TO CHG MUCH AS VRY WK TROF MOVS EWD ACRS NW CST TDA. RDG WILL
REBLD OVR SWRN STATES FRI AS TROF CONTS TO MOV EWD...SO XPC DCRG ONSHR
GRADS AND A LTL WRMR AFTN TEMPS. LAX 000. HENDERSON.
SYNOPTICALLY ALL MODELS MARCHING IN LOCK STEP MOVING WEAK RIDGE OUT
AND BRING WEAK TROF IN BY THIS AFTERNOON. TROF IS FORECAST TO LINGER
AT LEAST THROUGH 48 HOURS. SURFACE PRESSURE WHICH WAS QUITE WEAK
WEDNESDAY INCREASES SLIGHTLY TODAY AND REAMINS ABOUT THE SAME FRIDAY.
MARINE LAYER IS IN MUCH SOONER THAN LAST NIGHT PROBABLY AS A RESULT OF
SLIGHTLY BETTER ONSHORE FLOW ACARS DATA SUGGESTS THAT IT IS LOWER TOO
AROUND 1000 TO 1200 FEET. THIS SHOULD RESULT IN ONLY PATCHY CLOUDS IN
THE MORNING FOR THE VALLEYS. WILL NOT CHANGE MUCH FOR FRIDAYS FORECAST
DO NOT THINK CHANGES IN TROFING OR LOW LEVEL FLOW WILL BE SIGNIFICANT
ENOUGH TO DRAMATICALLY INCREASE THE CLOUDS OR TO LOWER THE TEMPS SO
WILL PLAY IT WITH PERSISTANCE. LITTLE CHANGE TO PERSISTENCE ON THE
CENTRAL COAST SALINAS VALLEY CLOUDS WILL BE TOO LOW TO MAKE IT INTO
PRB TONIGHT BUT BETTER PUSH FRIDAY COULD SPELL A LITTLE AM CLOUDS.
MRF AND EC NOW AGREEING ON DAYS 3 AND 4 BUT DIVERGE ON DAY 5 WHERE MRF
DEVELOPS A RIDGE WHEREAS EC KEEPS WITH THE TROF. MRF HAS BEEN TWIRLING
AROUND GRASPING FOR A SOLUTION OF LATE SO WILL CONTINUE TO USE EC
SOLUTION FOR EXTENDED SINCE IT HAS BEEN CONSISTENT DURING THE WEEK.
LONGWAVE TROF PATTERN OVER AREA SUGGESTS FOG AND BREEZY AFTERNOONS IN
THE DESERTS.
LAX 000. RORKE.
.LAX...NONE.