EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSAN 305 AM PDT SUN AUG 8 1999
...SYNOPSIS...
AN UPPER LOW ALONG THE OREGON COAST WILL REDEVELOP OFF THE CENTRAL
CALIFORNIA COAST TONIGHT AND MONDAY...THEN SLOWLY WEAKEN TUESDAY.
COOLER THAN NORMAL TEMPERATURES WILL CONTINUE ACROSS SOUTHERN
CALIFORNIA THROUGH TUESDAY.
...DISCUSSION...
UPR LOW ALG THE OR CST WITH UPR TROUGH EXTENDING S ALG THE ENTIRE W
CST WITH MDT SWLY FLOW ALF OVR SRN CA. ETA/AVN SIMILAR IN
REDEVELOPING THE CLOSED LOW OFF THE CNTRL CA CST TONIGHT AND MON...
WITH THE UPR LOW SLOWLY WKNG ALG THE CNTRL CA CST TUE. HEIGHTS OVR
SRN CA CHANGE LTL TODAY. GREATEST HEIGHT FALLS FOR SRN CA OCCUR MON
AND MON NIGHT...THEN HEIGHTS CHANGE LTL FOR TUE. AN ACARS SOUNDING
FM LAX LATE SAT AFTERNOON SHOWED A WK INVERSION BASE NR 1000 FT WITH
THE 00Z NKX SOUNDING SHOWING A WK INVERSION BASE NR 2000 FT. EXPECT
LTL CHANGE IN INVERSION HEIGHT THRU TODAY...THEN SLIGHT DEEPENING
TONIGHT AND MON...AND SOME ADDITIONAL DEEPENING MON NIGHT AND TUE.
VRY WK INVERSION STRENGTH SHOULD LIMIT STRATUS COVERAGE TO "PATCHY"
NRN SXNS OF FORECAST AREA THIS MORNING WITH "AREAS" COVERAGE
CONFINED TO SRN SXSNS (SAN COUNTY CST/VLYS) WHERE WK INVERSION IS A
LTL STRONGER. SOME MINOR STRENGTHENING OF THE MARINE INVERSION
SUGGESTED BY A MINOR INCR IN 850 MB TEMPERATURE SUGGESTS "AREAS"
COVERAGE FOR STRATUS MAY EXTEND FARTHER N TONIGHT/MON MORNING.
BUT...AGAIN...EXPECT GREATEST AREAL EXTENT TO STRATUS TONIGHT WL BE
SRN SXNS.
HEIGHT FALLS AND MID LVL COOLING (MON NIGHT) NOT OPTIMALLY TIMED
DIURNALLY TO ALLOW MINOR INTRUSION OF MID LVL MSTR FM THE SOUTHEAST
TO AID IN THUNDERSTORM DEVELOPMENT OVR THE MTNS. PROBABLY PARTLY
CLOUDY OVR THE MTNS FOR MON AFTERNOON AND TUE AFTERNOON IS THE WAY
TO GO...BUT A SHOWER OR THUNDERSTORM OVR THE MTNS FOR TUE AFTERNOON
IS NOT OUT OF THE QUESTION...ESPECIALLY IF TIMING OF HEIGHT
FALLS/MID LVL COOLING INTO SRN CA IS DELAYED. OTHERWISE...WK ONSHORE
LOW LVL FLOW WL CONTINUE WITH COOLER THAN NORMAL TEMPERATURES THRU
TUE.
SAN 000
.SAN...MARINE WEATHER STATEMENT FOR MINOR TIDAL OVERFLOW ALG CST.
MARTIN