SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NWS LOS ANGELES/OXNARD CA
AFDLOX 901 PM PST SAT MAR 31 2001
PRESSURE GRADIENTS THIS EVENING ARE BASICALLY ONSHORE...WITH
EASTERLY GRADIENTS STRONGEST. MSAS SFC PRES CONFIRMS THIS WITH 1006
MB LOW SITTING OVER DEATH VALLEY...PULLING LOW CLOUDS INLAND.
SATELLITE SHOWING LOW CLOUDS CERTAINLY PUSHING INLAND FROM THE
COAST. MARINE LAYER PER SOUNDINGS AND ACARS APPEARS TO BE ABOUT
1500 FT DP AT VBG AND 2500 FT DP NEAR ONT.
AS FLAT RIDGE OVERHEAD BECOMES MORE TROUGH-LIKE TONIGHT...AND IN
ADVANCE OF MORE SIGNIFICANT LONGWAVE TROUGH DEVELOPING SOUTH FROM
PAC NW...MARINE LAYER TO DEEPEN...POSSIBLY AS DEEP AS 5000 TO 6000
FT BY MONDAY. DAY SHIFT HAD A GOOD HANDLE ON THIS AND WILL CONTINUE
THE IDEA OF LOW CLOUDS AND FOG HANGING AROUND FOR MUCH OF THE SHORT
RANGE ESP NEAR AND JUST INLAND FROM THE COAST. NW FLOW OFF THE
COAST STRENGTHENS SUNDAY NIGHT AND MONDAY...SO EDDY CIRCULATION
CERTAIN TO REDEVELOP...FURTHER ENHANCING ONSHORE FLOW AND MARINE
LAYER. WEAK SYNOPTIC SCALE LIFT AND OROGRAPHIC LIFT ON COASTAL
SLOPES LIKELY TO PRODUCE AREAS OF DRIZZLE...ESP SUNDAY NIGHT AND
MONDAY.
MODELS STILL DROPPING A CUTOFF LOW OVER SRN CA BY WEDNESDAY
YIELDING THE BEST CHC OF SHRA FOR OUR AREA. HOWEVER...MOISTURE
ADVECTION NOT THAT IMPRESSIVE SO NOT LOOKING AT A BIG DEAL. LATEST
GUIDANCE MOVED THE LOW EAST OF SRN CA BY THURSDAY...SO JUST KEPT
CHC SHRA IN THE MTNS THURS DUE TO NORTHERLY UPSLOPE FLOW. AIRMASS
CERTAINLY TO TREND COOLER EARLY NEXT WEEK...EVEN COLD ENOUGH FOR
WHATEVER PRECIP THERE IS TO FALL AS SNOW IN HIGHER ELEVATIONS.
ONLY UPDATES TO ZONES THIS EVENING WILL BE TO TAKE OUT ANY EVENING
WORDING AND ADJUST SKY CONDITIONS.
LAX 000-. MOYER.
.LAX...NONE.