000
FXUS66 KSGX 310429
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 PM PDT FRI JUL 30 2010

.SYNOPSIS...
THE MARINE LAYER AND ONSHORE FLOW WILL CONTINUE THE NIGHT AND
MORNING COASTAL LOW CLOUDS...CLEARING TO NEAR THE BEACHES EACH
AFTERNOON. BELOW NORMAL TEMPERATURES WILL CONTINUE IN MOST AREAS
WEST OF THE MOUNTAINS THROUGH THE WEEKEND. SOME AFTERNOON CLOUDS
WILL OCCUR OVER THE MOUNTAINS DUE TO SOME MOISTURE ALOFT FROM THE
SOUTHEAST. HIGH PRESSURE ALOFT WILL STRENGTHEN NEXT WEEK AND BRING A
WARMING TREND.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

A LITTLE BIT OF WARMING ABOVE THE MARINE INVERSION RESULTED IN
LITTLE OR NO CLEARING ALONG THE SAN DIEGO COUNTY AND SOUTHERN ORANGE
COUNTY COASTS THIS AFTERNOON. SLIGHT COOLING ALOFT SHOULD HELP MAKE
CLEARING A BIT FASTER ON SATURDAY...THOUGH SOME IMMEDIATE COASTAL
AREAS WILL STILL HAVE STRATUS IN THE AFTERNOON. MOISTURE WAS
ABUNDANT IN THE 700-550 MB LAYER...AND THIS RESULTED IN QUITE A FEW
CLOUDS OVER THE MTNS TODAY. HOWEVER...INSTABILITY WAS
LIMITED...LARGELY DUE TO VERY WARM RIDGING AT 500 MB...SO AT MOST
THERE WERE JUST ISOLATED TOWERING CUMULUS AND NO TSTORMS THIS
AFTERNOON. CONDITIONS DO NOT LOOK ANYMORE FAVORABLE FOR TSTORMS SAT
AS THE MODELS ARE INDICATING ANY GULF MOISTURE SURGE TO STAY EAST OF
SAN DIEGO COUNTY...AND SOME COOLING WILL OCCUR OVER THE MTNS TO KEEP
INSTABILITY LOW. MID-LEVEL MOISTURE WILL GRADUALLY LOWER THROUGH
MONDAY.

THE LOW PRESSURE TROUGH OVER THE PAC NW WILL GRADUALLY WEAKEN EARLY
NEXT WEEK AND ALOFT FOR THE STRONG HIGH ALOFT OVER THE S CENTRAL US
TO SPREAD WEST TO SO-CAL AND CONNECT WITH ANOTHER HIGH OVER THE
PACIFIC. THIS WILL ALLOW TEMPS TO RECOVER TO NEAR NORMAL BY TUE AND
BECOME A LITTLE ABOVE NORMAL WED/THU...AND POSSIBLY BEYOND. FOR
NOW...THE HIGH AXIS WILL STAY AT OR JUST SOUTH OF OUR LATITUDE...SO
MONSOONAL MOISTURE SHOULD BE MINIMAL MOST OF NEXT WEEK. THE MARINE
LAYER TYPICALLY RETREATS TO IMMEDIATE COASTAL AREAS IN THIS
PATTERN...SO EVEN THE COASTAL AREAS SHOULD BE WARMER BY MID-WEEK.

&&

.AVIATION...
310330Z...THE STRATUS ALONG THE SAN DIEGO AND ORANGE COUNTY COASTS
WILL SPREAD INLAND ABOUT 15 SM TONIGHT WITH BASES BETWEEN 900 AND
1400 FT MSL AND TOPS AROUND 2000 FT. 5-15 SM INLAND...MVFR AND
LOCALLY LOWER VIS AFTER 08Z WILL IMPROVE TO VFR BY 20Z. STRATUS WILL
SCATTER OUT AFTER 16Z INLAND...BUT WILL LIKELY AFFECT THE COASTAL
AIRPORTS OF KSAN AND KCRQ UNTIL 20Z. A SHALLOWER MARINE LAYER WILL
BRING CIGS BACK TO THE COASTAL AREAS AFTER 03Z. ABOVE THE MARINE
LAYER...AREAS OF ALTOCU ABOVE FL120 WITH ISOLATED TCU OVER THE MTS
IN THE EARLY AFTERNOON...AS WELL AS A CIRRUS LAYER NEAR FL250
THROUGHOUT THE DAY.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

PUBLIC...MAXWELL
AVIATION...TS

NWS SGX Office Area Forecast Discussion