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AREA FORECAST DISCUSSION

 
 FXUS66 KSGX 242136
 AFDSGX
 
 AREA FORECAST DISCUSSION...UPDATED
 NATIONAL WEATHER SERVICE SAN DIEGO CA
 200 PM PST TUE NOV 24 2009
 
 .SYNOPSIS...HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL BRING 
 CLEAR SKIES AND WARMER DAYS THROUGH THURSDAY WITH LOCAL GUSTY WINDS 
 THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES. COOLER WITH INCREASED 
 CLOUDS FRIDAY THROUGH THE WEEKEND AS A LOW PRESSURE TROUGH MOVES 
 PAST TO THE NORTH. GUSTY OFFSHORE WINDS AGAIN SUNDAY AND MONDAY. 
 
 &&
 
 .DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
 ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
 
 TONIGHT THROUGH THURSDAY...CLEAR SKIES THIS AFTERNOON AND TONIGHT 
 WITH LOCALLY GUSTY WINDS BELOW THE PASSES AND CANYONS. WINDS HAVE 
 DECREASED THIS AFTERNOON WITH GUSTS BELOW 35 MPH. OFFSHORE PRESSURE 
 GRADIENTS CONTINUE WITH ABOUT -9 MB SAN-TPH AND -2 MB SAN-IPL. 
 
 RIDGING ALOFT AND OFFSHORE FLOW WILL CONTINUE CLEAR SKIES WITH 
 WARMER DAYS. TEMPERATURES WILL INCREASE A LITTLE EACH DAY...WITH THE 
 WARMEST DAY OCCURRING ON THANKSGIVING WHEN DAYTIME HIGHS WILL BE 
 ABOUT 5 TO 10 DEGREES ABOVE SEASONAL AVERAGES EXCEPT ALONG THE 
 IMMEDIATE COAST WHERE TEMPS WILL BE CLOSER TO AVERAGE. THE OFFSHORE 
 FLOW WILL MAINLY BE GRADIENT DRIVEN WITH WEAK UPPER LEVEL AND 
 THERMAL SUPPORT. ADVISORY STRENGTH WINDS WERE REPORTED THIS MORNING 
 IN THE SANTA ANA MTNS AND THE FOOTHILLS OF THE SAN BERNARDINO MTNS 
 AND COULD RETURN BRIEFLY ON WEDNESDAY MORNING...OTHERWISE WINDS ARE 
 EXPECTED TO REMAIN BELOW 35 MPH THROUGH THURSDAY WITH ONLY ISOLATED 
 STRONGER GUSTS AT TIMES IN THE MOST WIND-PRONE AREAS. THE WARM AND 
 DRY OFFSHORE FLOW WILL MAINTAIN AN ELEVATED FIRE WEATHER HAZARD. 
 
 FRIDAY THROUGH TUESDAY...AN UPPER LEVEL LOW PRESSURE TROUGH WILL 
 MOVE PAST TO THE N FRIDAY AND SATURDAY BRINGING COOLING AND HIGHER 
 HUMIDITIES WITH A RETURN OF ONSHORE FLOW. THERE WILL BE A BRIEF 
 RETURN OF MARINE LAYER CLOUDS AND VARIABLE HIGH CLOUDINESS FRIDAY 
 AND SATURDAY. AS THE TROUGH MOVES EAST...NORTHERLY OFFSHORE FLOW 
 COULD DEVELOP AND BRING STRONG GUSTY WINDS TO MUCH OF SOCAL. 
 TEMPERATURES SHOULD REMAIN BELOW SEASONAL AVERAGES THROUGH SUNDAY. 
 THE OFFSHORE WINDS WILL WEAKEN MONDAY AND TEMPERATURES SHOULD 
 INCREASE A LITTLE ON MON AND TUE.. 
 
 &&
 
 .AVIATION...
 242000Z...OFFSHORE FLOW WILL KEEP THE MARINE LAYER DEPTH NEAR SEA 
 LEVEL THROUGH THANKSGIVING. AS A RESULT A MOSTLY CLEAR SKY WITH 
 UNRESTRICTED VISIBILITIES WILL CONTINUE THROUGH WEDNESDAY AND 
 THANKSGIVING.
 
 LOCAL GUSTY NORTHEAST WINDS WITH ASSOCIATED UP AND DOWN DRAFTS AND 
 LOW LEVEL WIND SHEAR WILL CONTINUE THROUGH WEDNESDAY.  HORTON
 
 &&
 
 .SGX WATCHES/WARNINGS/ADVISORIES...
 CA...RED FLAG WARNING UNTIL 10 AM PST THURSDAY FOR SANTA ANA
      MOUNTAINS-INCLUDING THE TRABUCO RANGER DISTRICT OF THE
      CLEVELAND NATIONAL FOREST.
 
 PZ...NONE.
 
 &&
 
 

 
 PUBLIC/FIRE WEATHER...PG
 AVIATION/MARINE...HORTON
 
 
 

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