000
FXUS66 KSGX 271059
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
300 AM PST FRI NOV 27 2009

.SYNOPSIS...HIGH PRESSURE ALOFT WEAKENS AS A TROUGH DROPS DOWN THE 
STATE TODAY. AN UPPER LEVEL LOW PRESSURE SYSTEM IS FORECAST TO 
DEVELOP WITH THE TROUGH AND MOVE OVER SOUTHERN CALIFORNIA SATURDAY. 
THE MARINE LAYER WILL DEEPEN RAPIDLY TODAY WITH LOW CLOUDS MOVING 
OVER THE COAST THIS AFTERNOON. SHOWERS ARE POSSIBLE FRIDAY NIGHT 
THROUGH SATURDAY WITH SNOW IN THE HIGHER ELEVATIONS. AN OFFSHORE 
FLOW DEVELOPS SUNDAY AND INCREASES SUNDAY NIGHT THROUGH MONDAY 
MORNING...DECREASING MONDAY AFTERNOON. HIGH PRESSURE ALOFT MOVES 
OVER LATE SUNDAY THROUGH MONDAY...WEAKENING TUESDAY WITH LITTLE 
CHANGE THROUGH THURSDAY.

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

TROUGH MAKING ITS WAY THROUGH FAR NORTHERN CALIFORNIA EARLY THIS 
MORNING. SOME HIGH CLOUDS WILL MOVE THROUGH THE AREA TODAY AHEAD OF 
IT. AN UPPER LEVEL LOW PRESSURE SYSTEM IS FORECAST TO DEVELOP WITH 
THE TROUGH TODAY AND DIVE SOUTH THROUGH THE STATE. THE LOW IS 
EXPECTED TO BE OVER SOCAL SATURDAY. THE MARINE LAYER WILL RAPIDLY 
INCREASE LATER TODAY AND MOVE INTO THE COAST BY AFTERNOON. LOW 
CLOUDS WILL COVER THE COASTAL BASIN TONIGHT WITH DRIZZLE OR LIGHT 
RAIN POSSIBLE. SHOWERS ARE EXPECTED TO MOVE OVER SOCAL SATURDAY AS 
THE UPPER LEVEL LOW MOVES OVER. WITH THE LOW NEAR THE AREA... 
THUNDERSTORMS COULD DEVELOP BUT WHERE THE LOW ENDS UP IS STILL TO BE 
DETERMINED. THE LOW MOVES SOUTH EARLY SUNDAY WITH HIGH PRESSURE 
ALOFT RIDGING OVER THE STATE AND SLIDING SOUTH. HIGH PRESSURE MOVES 
OVER LATE SUNDAY THROUGH MONDAY WITH AN OFFSHORE FLOW DEVELOPING AND 
NORTHEAST WINDS ALOFT. THE OFFSHORE FLOW INCREASES SUNDAY NIGHT 
THROUGH MONDAY MORNING WITH STRONG GUSTY NORTHEAST WINDS OVER THE 
MOUNTAINS...INLAND VALLEYS AND INTO ORANGE COUNTY POSSIBLE. THE 
OFFSHORE FLOW FALLS APART MONDAY AFTERNOON WITH A WEAK FLOW THROUGH 
THURSDAY. HIGH PRESSURE ALOFT WEAKENS TUESDAY WITH NOT MUCH CHANGE 
THROUGH THURSDAY.

&&

.AVIATION...
271000Z...SCT-BKN CIRRUS AOA FL200 AND UNRESTRICTED VISIBILITIES 
THROUGH THE MORNING. CIGS BELOW 500 FT MSL AND DENSE FOG COULD 
BRIEFLY IMPACT THE COASTAL AIRPORTS EARLY THIS AFTERNOON. THE MARINE 
LAYER WILL RAPIDLY DEEPEN THIS EVENING WITH MVFR CIGS PREVAILING 
AFTER ABOUT 06Z. THERE IS A CHANCE OF SHOWERS LATE TONIGHT THROUGH 
SATURDAY.

&&

.MARINE...
A LONG PERIOD WNW SWELL WILL CONTINUE TO FILL IN TODAY THROUGH 
SATURDAY. SURF HEIGHTS WILL BE BETWEEN 4 AND 7 FEET WITH SETS TO 9 
FEET THIS AFTERNOON. OCCASIONAL HIGHER SETS ARE POSSIBLE AT EXPOSED 
BEACHES IN SOUTHERN SAN DIEGO COUNTY. THE HIGH SURF WILL ALSO 
GENERATE STRONG RIP CURRENTS. THE SURF AND SWELL WILL BEGIN TO 
SUBSIDE ON SUNDAY.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

HIGH SURF ADVISORY FRIDAY THROUGH SUNDAY...SEE LAXCFWSGX.

SMALL CRAFT ADVISORY FOR THE OUTER COASTAL WATERS FRIDAY AFTERNOON 
THROUGH SUNDAY MORNING. SEE LAXCWFSGX. 

&&

$$

PUBLIC...WHITLOW
AVIATION/MARINE...SS