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AREA FORECAST DISCUSSION

 
 FXUS66 KSGX 241701
 AFDSGX
 
 AREA FORECAST DISCUSSION...UPDATED
 NATIONAL WEATHER SERVICE SAN DIEGO CA
 900 AM 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.
 
 TODAY THROUGH THURSDAY...CLEAR SKIES THIS MORNING WITH LOCALLY GUSTY 
 WINDS OCCURRING BELOW THE PASSES AND CANYONS. MOST GUSTS HAVE BEEN 
 BELOW 35 MPH...HOWEVER ISOLATED STRONGER GUSTS HAVE BEEN OBSERVED 
 INCLUDING 46 MPH AT FREMONT CANYON AND 31 MPH AT RIALTO. OFFSHORE 
 PRESSURE GRADIENTS CONTINUE WITH ABOUT -11 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 ARE EXPECTED IN THE INLAND 
 EMPIRE AND SANTA ANA MOUNTAINS AND FOOTHILLS THIS MORNING AND 
 POSSIBLY AGAIN ON WED 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...
 241430Z...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...WIND ADVISORY UNTIL NOON PST TODAY FOR SAN BERNARDINO AND 
      RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SANTA ANA 
      MOUNTAINS AND FOOTHILLS.
 
 PZ...NONE.
 
 &&
 
 

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

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US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Eureka Weather Forecast Office
300 Startare Drive
Eureka, California 95501

Tel: (707) 443-6484