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AREA FORECAST DISCUSSION

 
 FXUS66 KMTR 230330
 AFDMTR
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA
 830 PM PDT MON SEP 22 2008
 
 .DISCUSSION...AS OF 8:30 PM PDT MONDAY...CLEAR SKIES PERSIST ACROSS
 THE REGION THIS EVENING WITH THE EXCEPTION OF A FEW HIGH CLOUDS
 THAT ARE MOVING ALONG WITH THE ZONAL FLOW ALOFT. A RECAP OF TODAYS
 HIGHS REVEAL UPPER 60S TO LOWER 70S ALONG THE COAST WITH UPPER 70S TO
 LOWER 80S AROUND THE BAY. INLAND LOCATIONS SAW TEMPERATURES REACH
 INTO THE MID TO UPPER 80S. OVERALL AN INCREASE OF ABOUT 5 TO 13
 DEGREES OVER YESTERDAY HIGHS.
 
 HIGH PRESSURE BUILDING IN OVER THE PACIFIC NORTHWEST AND A THERMAL
 TROUGH ALONG THE COAST HAS RESULTED IN A ROBUST NORTHERLY GRADIENT
 FROM ACV TO SFO AND LIGHT OFFSHORE FLOW. THIS PATTERN IS MAINTAINING
 CLEAR SKIES OVER THE DISTRICT AT THIS TIME. CLEAR SKIES ARE EXPECTED
 TO PERSIST THROUGH TONIGHT AND TUESDAY...AND MOST LIKELY WEDNESDAY.
 HOWEVER IT REMAINS A BIT UNCERTAIN WHEN THE MARINE LAYER WILL
 REESTABLISH ITSELF BUT GUIDANCE IS POINTING TOWARD WEDNESDAY NIGHT
 INTO THURSDAY AT THIS POINT.
 
 CLEAR SKIES WILL BRING SLIGHTLY COOLER NIGHTS AND WARMER DAYS
 MOST NOTABLY OVER INLAND AREAS FOR THE NEXT COUPLE OF DAYS/NIGHTS.
 INLAND VALLEY WILL SEE THE COOLEST OVERNIGHT TEMPERATURES.
 
 FROM PREVIOUS DISCUSSION...THE GFS 40 AND ECMWF ARE IN FAIR AGREEMENT
 ON BOTH THE TIMING AND POSITION OF THE UPPER-LEVEL TROUGH FORECAST TO
 PASS NORTH OF THE FORECAST AREA WEDNESDAY. THIS TROUGH WILL PUSH THE
 SURFACE THERMAL TROUGH INLAND RESULTING IN THE RETURN OF ONSHORE FLOW
 AND STRATUS TO THE AREA. ALTHOUGH THE PREVIOUSLY MENTIONED UPPER
 LEVEL TROUGH WILL PASS WAY TO THE NORTH OF THE FORECAST AREA IT WILL
 FLATTEN THE CURRENT RIDGE OF HIGH PRESSURE INTO A ZONAL FLOW PATTERN
 AND SET THE STAGE FOR A COOLING TREND EXPECTED TOWARDS THE END OF THE
 WEEK.
 
 FORECAST PACKAGE APPEAR TO BE ON TRACK THEREFORE NO UPDATES NEEDED
 AT THIS TIME.
 
 &&
 
 .AVIATION...AS OF 5:00 PM PDT MONDAY...DRY NORTHERLY FLOW AT THE
 SURFACE WILL RESULT IN VFR CONDITIONS THROUGH TUESDAY.
 
 
 &&
 
 .MTR WATCHES/WARNINGS/ADVISORIES...
        .TNGT...SCA...PT ARENA TO PIGEON PT 0-60 NM
                SCA...PIGEON PT TO PT PIEDRAS BLANCAS 0-60 NM
                      UNTIL 10 PM
                SCA...SAN FRANCISCO BAY UNTIL 12 AM
 

 
 PUBLIC FORECAST: C WALBRUN/LARRY
 AVIATION/MARINE: CANEPA/W PI
 
 
 NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO
 
 
 

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