Expires:No;;972150
FPUS56 KSGX 132031
ZFPSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PDT FRI AUG 13 2010
.SYNOPSIS...
NIGHT AND MORNING LOW CLOUDS WILL CONTINUE IN THE COASTAL AREAS WITH 
FAIR WEATHER INLAND. WARMER WITH A DECREASING MARINE LAYER THROUGH 
NEXT WEEK AS UPPER LEVEL HIGH PRESSURE BUILDS IN FROM THE EAST.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THE MARINE LAYER REMAINS ABOUT 1500 FEET DEEP THIS AFTERNOON AND LOW 
CLOUDS HAVE CLEARED EXCEPT FOR OVER THE COASTAL AREAS AND SOME 
BEACHES.
PREVAILING ONSHORE FLOW AND WEAK UPPER LEVEL LOW PRESSURE TROUGHING 
WILL CONTINUE NIGHT AND MORNING COASTAL LOW CLOUDS AND PATCHY FOG 
THROUGH THE WEEKEND. TEMPERATURES WILL REMAIN ABOUT 3-5 DEGREES 
BELOW SEASONAL AVERAGES IN MOST AREAS. 
A WARMING TREND WILL BEGIN ON MONDAY AND CONTINUE THROUGH FRIDAY AS 
UPPER LEVEL HIGH PRESSURE CENTERED OVER NEW MEXICO EXPANDS WESTWARD 
OVER SOCAL. INLAND TEMPERATURES WILL INCREASE TO SEASONAL AVERAGES 
OR ABOVE. THE MARINE LAYER WILL DECREASE...LIMITING THE NIGHT AND 
MORNING LOW CLOUDS TO THE COASTAL AREAS. HOWEVER...CONTINUING 
ONSHORE FLOW WILL KEEP TEMPERATURES AT THE COAST A LITTLE BELOW 
SEASONAL AVERAGES.
SOME CUMULUS CLOUDS COULD DEVELOP OVER THE MTNS IN THE AFTERNOONS 
FOR MON THROUGH WED AS SE FLOW BRINGS MID LEVEL MOISTURE INTO THE 
LOCAL AREA...BUT BY THU THE FLOW ALOFT TURNS WESTERLY AGAIN AND THE 
ATMOSPHERE DRIES OUT.
FOR NEXT WEEKEND...A LOW PRESSURE SYSTEM DEEPENING OVER THE PAC 
NORTHWEST COULD ONCE AGAIN INCREASE THE MARINE LAYER AND BRING 
COOLER CONDITIONS.
&&
.AVIATION...
131930Z...BROKEN STRATUS REMAINED ALONG MOST OF IMMEDIATE COAST AND 
NEAR SHORE WATERS. BASES BETWEEN FL008-012 AND TOPS FL015. STRATUS 
FILLING IN ALONG REMAINDER OF COAST BETWEEN 14/0000-0300 UTC AND  
SPREADING INLAND 10-15SM BETWEEN 0600-0900 UTC WITH BASES/TOPS  
LOWERING TO FL005/FL013. STRATUS BREAKING UP SATURDAY MORNING AROUND 
14/1600-1700 UTC. IF THIS VERIFIES THEN BETWEEN 14/1000-1500 UTC 
AIRPORTS ON COASTAL MESAS AND IN LOWER VALLEYS WILL BE IMPACTED WITH 
CIGS AOB 500 FT AGL/1SM... THIS INCLUDES KCRQ...KNKX...KMYF...KRNM. 
OVER REMAINING AREAS OF SW CALIFORNIA SKIES CONTINUE CLEAR WITH NO 
RESTRICTIONS TO VSBY.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...NONE.
&&
$$
PUBLIC...PG
AVIATION...BALFOUR