AREA FORECAST DISCUSSION

 
 FXUS66 KSGX 250332
 AFDSGX
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SAN DIEGO CA
 930 PM PDT FRI OCT 24 2008
 
 .SYNOPSIS...HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL CONTINUE 
 SUNNY WARM DAYS AND CLEAR COOL NIGHTS THROUGH THE WEEKEND. A COUPLE 
 OF UPPER LEVEL LOW PRESSURE SYSTEMS WILL BRING MORE CLOUDS AND 
 COOLING DURING THE SECOND HALF OF NEXT WEEK. 
 
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 .DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
 ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
 
 .SHORT TERM (TONIGHT-MON)...SKIES WERE CLEAR THIS EVENING EXCEPT FOR 
 A LITTLE THIN CI. THE 00Z NKX SOUNDING WAS DRY WITH WEAK NE WINDS 
 THROUGH MOST OF THE COLUMN. WEAK OFFSHORE GRADIENTS FROM THE N WITH 
 ABOUT -6 MB SAN-TPH AND WEAK ONSHORE TO THE E. 
 
 HIGH PRESSURE WILL REMAIN ALOFT WHILE SLOWLY SHIFTING E AND WEAK 
 SYNOPTIC SCALE OFFSHORE GRADIENTS WILL CONTINUE FROM THE NE. THIS 
 WILL MAINTAIN WARM AND VERY DRY DAYS INLAND. THE WEAK OFFSHORE FLOW 
 WILL PREVAIL DURING THE NIGHTS AND MORNINGS BUT A SEA BREEZE WILL 
 DEVELOP EACH AFTERNOON. MINOR DAY TO DAY TEMP CHANGES ARE EXPECTED. 
 THE CLEAR SKIES AND DRY AIR MASS WITH RELATIVELY LIGHT WINDS WILL 
 ALLOW GOOD RADIATIONAL COOLING AT NIGHT. THERE COULD BE A LITTLE 
 HIGH CLOUDINESS AT TIMES AND A FEW PATCHES OF STRATUS NEAR THE S 
 COAST DURING THE NIGHTS AND MORNINGS...OTHERWISE CLEAR. 
 
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 .LONG TERM (TUE-FRI)...THERE ARE BIG DIFFERENCES IN THE MODELS 
 DURING THE EXTENDED PERIOD. IT CURRENTLY LOOKS LIKE A WEAK UPPER LOW 
 WILL MOVE PAST TO THE N LATE TUE BRINGING A RETURN OF MARINE LAYER 
 CLOUDS AND A LITTLE COOLING. A STRONGER TROUGH WOULD BRING MORE 
 CLOUDS AND COOLING TOWARD NEXT WEEKEND WITH THE GFS INDICATING 
 PRECIP. HOWEVER...THE ECMWF IS DRY. 
 
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 .FIRE WEATHER...THE RED FLAG WARNING FOR LOW HUMIDITY REMAINS IN 
 EFFECT THROUGH SUN EVENING. HIGH PRESSURE ALOFT WILL CONTINUE WARM 
 DAYS FOR INLAND AREAS THROUGH THE WEEKEND WITH WEAK OFFSHORE WINDS 
 AT TIMES...MAINLY DURING THE NIGHTS AND MORNINGS. THE ATMOSPHERE 
 WILL REMAIN VERY DRY WITH SEVERAL HOURS OF DAYTIME HUMIDITIES BELOW 
 10 PERCENT FOR INLAND AREAS WITH POOR OVERNIGHT RECOVERY. THE RED 
 FLAG WARMING MAY HAVE TO BE EXTENDED INTO MON. A WEAK TROUGH OF LOW 
 PRESSURE OFF THE CALIFORNIA COAST WILL MOVE SLOWLY INLAND THROUGH 
 MID WEEK. THIS WILL BRING SLOW COOLING...GRADUALLY INCREASING 
 HUMIDITIES...AND A RETURN AND SLOW DEEPENING OF THE MARINE LAYER. 
 
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 .AVIATION...250300Z
 CLEAR SKIES...UNLIMITED VIS AND LIGHT WINDS THROUGH SAT.
 
 &&
 
 .SGX WATCHES/WARNINGS/ADVISORIES...RED FLAG WARNING UNTIL 8 PM 
 SUNDAY FOR THE MOUNTAINS AND INLAND VALLEYS. SEE LAXRFWSGX. 
 
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 PUBLIC...ATKIN
 AVIATION...MOEDE
 
 
 
 
 

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