EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSAN 205 PM PST SAT MAR 17 2001
...SYNOPSIS...
BUILDING HIGH PRESSURE ALOFT WILL BRING A WARMING TREND ALONG WITH
MOSTLY CLEAR SKIES SUNDAY. WARM WEATHER SHOULD CONTINUE THROUGH
MID-WEEK...EXCEPT NEAR THE IMMEDIATE COAST WHERE IT WILL BE COOLER
DUE TO THE COLD OCEAN WATER. COOLING AND INCREASING CLOUDS WILL
OCCUR LATE IN THE WEEK. THE SPRING EQUINOX OCCURS ON TUESDAY AT 531
AM...PACIFIC STANDARD TIME.
...DISCUSSION...
THE PASS/CANYON WINDS WERE MINIMAL THIS MORNING. THE ONLY PLACE
REGISTERING ANY SORT OF SIGNIFICANT WINDS WAS CAMPO WITH A PEAK GUST
OF 34 MPH. EXPECT JUST LOCAL PASS/CANYON WINDS TONIGHT...MAINLY IN
E-W CANYONS/PASSES LIKE CAMPO. THERE IS A LOT OF HAZE WEST OF THE
MTNS...A SEA BREEZE...AND ACARS SOUNDINGS SHOW A WEAK INVERSION
AROUND 3000 FEET ABOVE SEA LEVEL. SO...A FEW LOW CLOUDS COULD FORM
TONIGHT...MAINLY NEAR THE COAST AS WE HAVE SOME SUBSIDENCE
ALOFT...THOUGH AN OFFSHORE PUSH LATE IN THE NIGHT SHOULD DISSIPATE
THIS BY SUNRISE.
850 MB TEMPS INCREASE QUITE A BIT THROUGH SUNDAY...THEN INCREASE
SLIGHTLY THROUGH TUESDAY. TEMPS AT THAT LEVEL COULD REACH 20 DEG C
BY TUESDAY...WHICH MEANS SURFACE TEMPS COULD BE AS HIGH AS AROUND 95
IN THE DESERTS FOR THE FIRST TIME THIS YEAR.
IN THE EXTENDED...ONSHORE FLOW AT THE SURFACE AND ALOFT GENERALLY
INCREASE TUE-THU FOR INCREASING LOW CLOUDS AND FOG WEST OF THE MTNS.
AROUND FRI/SAT...A TROUGH OF SOME SORT COULD MOVE IN...THOUGH 12Z
AVN HAS TRENDED A BIT FURTHER WEST WITH THE TROUGH. ECM HAS A LARGE
CLOSED LOW AROUND 140W FRI...AND IF THAT IS STATIONARY...THEN OUR
FAIR WEATHER COULD BE EXTENDED INTO FRI/SAT. HOWEVER...12Z NOGAPS
AGREES MORE WITH THE MRF...AND THE TROUGH LOOKS LIKE IT WILL BE
NEGATIVELY-TILTED IF IT MOVES THROUGH...SO SOME CHANCE OF PRECIP IS
THERE FOR SATURDAY...THOUGH IT IS SMALL. OTHER NEARBY OFFICES ARE
PLANNING ON LEAVING PRECIP OUT...SO FOR NOW...I WILL TOO.
SAN 0000
.SAN...NONE.
MAXWELL