FXUS66 KSGX 200915
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
220 AM PDT SAT SEP 20 2008
.SYNOPSIS...
THE MARINE LAYER AND ONSHORE FLOW WILL CAUSE AREAS OF COASTAL LOW 
CLOUDS AND FOG DURING THE NIGHTS AND MORNINGS...EXTENDING LOCALLY 
INLAND. UPPER LEVEL LOW PRESSURE MOVING PAST TO THE NORTH WILL BRING 
COOLER WEATHER INTO EARLY NEXT WEEK. LOCALLY WINDY IN THE MOUNTAINS 
AND DESERTS AT TIMES. WARMER DURING THE SECOND HALF OF NEXT WEEK 
UNDER HIGH PRESSURE. 
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
.SHORT TERM (TODAY THROUGH MONDAY)...
A TROUGH OF LOW PRESSURE MOVING INLAND THROUGH THE PACIFIC NORTHWEST 
WILL BRING SLOW COOLING THROUGH THE WEEKEND AND SLOW DEEPENING OF 
THE MARINE LAYER INTO MONDAY. THE MARINE LAYER HAS DEEPENED TO 
AROUND 1500 FEET AND CONTINUES TO DEEPEN. CURRENT SATELLITE IMAGERY 
SHOWS PATCHY STRATUS ALONG THE SAN DIEGO COUNTY COAST WITH A LARGER 
AREA ALONG THE CENTRAL COAST EXTENDING SOUTHWARD OVER THE OUTER 
COASTAL WATERS. THIS AREA IS EXPECTED TO OVERSPREAD THE COASTAL 
WATERS THROUGH SUNRISE AND SPREAD LOCALLY INLAND. 
&&
.LONG TERM (TUESDAY THROUGH FRIDAY)...
HIGH PRESSURE BUILDING OVER THE SOUTHWEST STATES WILL BRING WARMING 
TO ABOVE SEASONAL AVERAGES AND A SHALLOWER MARINE LAYER. 
&&
.AVIATION...
200900Z...MARINE LAYER INCREASING RAPIDLY WITH TOP CURRENTLY AROUND 
1800 FT. BASES AROUND 1500 FT MSL. VSBY MOSTLY ABOVE 7SM WITH AREAS 
3-5SM AND LOCAL BELOW 3SM IN THE FOOTHILLS. SMALL PATCH OF STRATUS 
CURRENTLY NEAR FAR SOUTHERN SAN DIEGO COUNTY COAST. EXPECT AREAS OF 
STRATUS MOVING INTO THE SAN DIEGO COUNTY INLAND VALLEYS AND SOME 
GETTING INTO ORANGE COUNTY. STRATUS WILL DISSIPATE BY AROUND 18Z. 
STRATUS SHOULD MOVE IN LATE AFTERNOON AND COVER THE COAST TO SAN 
DIEGO INLAND VALLEYS AND ORANGE COUNTY WITH SOME INTO THE WEST PART 
OF THE INLAND EMPIRE TONIGHT. EXPECT STRATUS TO CLEAR EARLIER 
SUNDAY. OTHERWISE CLEAR.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&
$$
PUBLIC...MARTIN
AVIATION/MARINE...WHITLOW
NWS ON THE WEB AT WEATHER.GOV/SANDIEGO