EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSAN 300 AM PST WED MAR 21 2001
...SYNOPSIS...
HIGH PRESSURE OVER SOUTHERN CALIFORNIA WILL SLOWLY WEAKEN THROUGH
THURSDAY WITH A GRADUAL COOLING TREND FOR SOUTHWEST CALIFORNIA. HIGH
PRESSURE WILL THEN REBUILD WITH A WARMING TREND FOR THE WEEKEND.
...DISCUSSION...
AVN/MRF PREFERRED FOR THE NEXT 7 DAYS. WK SHORTWAVE CNTRD NR
32N/135W WL MOVE ACROSS SRN CA LATE TONIGHT AND EARLY THU BRINGING
HIGH CLOUDS...A DEEPER MARINE LYR...AND A COOLING TREND TODAY AND
THU. OTHERWISE WK HIGH PRESSURE WL HOLD OVR SRN CA FOR THE NEXT 7
DAYS WITH NR NORMAL TEMPERATURES AT THE CST TO A LTL ABV NORMAL
TEMPERATURES INLAND.
IN THE NR TERM...TUE EVENING ACARS SOUNDINGS SHOWED THE BASE OF THE
MARINE INVERSION NR THE CST OF AROUND 900 FT WITH TOPS TO 1300
FT...CONSISTENT WITH THE SLOW DEEPENING FORECAST BY THE COAMPS MDL.
THE MARINE LYR IS EXPECTED TO CONTINUE SLOWLY DEEPENING TO AROUND
1500 FT THIS MORNING...AND 2000 FT TONIGHT AND THU. WL CONTINUE THE
DENSE FOG ADV IN ZONE 43...SAN COUNTY CST...MAINLY FOR DENSE FOG NR
MESAS AND OTHER HIGHER CSTL TRRN. DENSE FOG MAY EXTEND LCLLY INTO
LWR CSTL VLYS THIS MORNING AS WELL. CLRG WL BE SLOW NR THE CST
TODAY...WITH STRATUS SPREADING RAPIDLY INLAND EARLY THIS EVENING...
REACHING MUCH OF THE INLAND EMPIRE LATE TONIGHT. MOST AREAS WL CLR
FASTER THU AFTER MORNING LOW CLOUDS.
FRI WL BE THE TRANSITION DAY WITH MOST AREAS WARMER SAT THRU TUE. A
STEADY PROGRESSION OF SHORTWAVES INTO THE PAC NW DURG THE WEEKEND
INTO NEXT WEEK WL ALLOW FOR A CONTINUED MARINE LYR PRESENCE W OF THE
MTNS THRU THE WEEKEND. HENCE...WHILE TEMPERATURES WL WARM FROM
THU/FRI LVLS...TEMPERATURES WL NOT BE QUITE AS WARM AS THIS PAST
SUN/MON W OF THE MTNS. MTN/DESERT TEMPERATURES...HOWEVER...WL BE
NEAR LVLS OF THIS PAST SUN/MON.
SAN 000
.SAN...DENSE FOG ADVISORY...SEE LAXNPWSAN.
MARTIN