EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSAN 830 PM PDT SUN APR 2 2000
...SYNOPSIS...
A COASTAL EDDY WILL BRING COOLING TO AREAS WEST OF THE MOUNTAINS
ALONG WITH A RETURN OF NIGHT AND MORNING LOW CLOUDS AND FOG.
OTHERWISE...A GRADUAL COOLING TREND FOR SOUTHWEST CALIFORNIA DURING
THE WEEK AS THE UPPER RIDGE OF HIGH PRESSURE OVER SOUTHERN
CALIFORNIA GRADUALLY WEAKENS.
...DISCUSSION...
UPDATE TO ADJUST CLOUD WORDING AND TEMPERATURES FOR CST/VLY ZONES.
IN SPITE OF THE STRONG UPR RDG...CSTL EDDY ALLOWED THE MARINE LYR TO
DEEPEN TO AROUND 1500 FT AS SHOWN BY THE 00Z NKX RAOB AND IMPLIED BY
THE WIND FIELD IN LOW VERTICAL RESOLUTION ACARS SOUNDINGS FM LAX.
SATELLITE IMAGERY SHOWS AREAS OF LOW CLOUDS FORMING ALG THE CST
EXTENDING LCLLY INLAND FM SRN LOS ANGELES COUNTY S. AS THE EDDY
CONTINUES OVERNIGHT...LOW CLOUDS SHOULD INCR IN COVERAGE AND MOVE
SLOWLY INLAND. DEPTH OF THE MARINE LYR SHOULD LIMIT ANY DENSE FOG
FOR CSTL ZONES...BUT PATCHY DENSE FOG IS POSSIBLE IN THE SAN COUNTY
VLYS IF LOW CLOUDS MOVE FAR ENOUGH INLAND.
EXTENDED...ECMWF HAD BEEN THE LONE OUTLIER OF MRF/UKMET/ECMWF TRIO
IN NOT DEVELOPING A CUTOFF LOW WELL OFF THE CA CST FOR MID TO LATE
WEEK. LATEST RUN OF ECMWF HAS COME AROUND TO THE MRF/UKMET SOLN OF
CUTOFF LOW WELL OFF THE CST. GENERAL COOLING TREND FOR THE INTERIOR
AS HEIGHTS ALF GRADUALLY LWR WITH MINOR DAY TO DAY FLUCTUATIONS IN
THE MARINE LYR AS PAC SHORTWAVES PROGRESSING INLAND ACROSS THE PAC
NW IN FAST FLOW MODULATE CSTL EDDY DEVELOPMENT IN SRN CA.
SAN 0000
.SAN...NONE.
MARTIN