167   
FXUS66 KMTR 201221  
AFDMTR  
  
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA  
330 AM PDT WED AUG 19 2008  
   
DISCUSSION...AS OF 3:30 AM PST WEDNESDAY  
EXPECT MORE CLOUDS  
TONIGHT.  
  
CURRENT SATELLITE FOG PRODUCT SHOWS FEWER LOW CLOUDS ACROSS THE CWA  
COMPARED TO LAST NIGHT. RIGHT NOW THE MAIN CONCENTRATIONS ARE AT THE  
BAYS ALONG WITH SMALLER PORTIONS OF THE SALINAS AND SANTA CLARA  
VALLEY. PART OF IT CAN BE EXPLAINED BY THE FACT THE MARINE LAYER HAS  
BEEN SQUASHED DOWN TO UNDER 800S FEET. IN ADDITION...THE ONSHORE FLOW  
HAS NOT INCREASED WITH THE SOUTHERLY COMPONENT HAS GONE FROM NEUTRAL  
TO AROUND 1 MB. ONLY INTERESTING ITEM OF NOTE HAS BEEN THE CONTINUED  
GUSTY WINDS OVER THE EAST BAY HILLS/DIABLO RANGE AREA WHERE SEVERAL  
SENSORS ARE GUSTING TO OVER 25 MPH.  
  
MAIN STORY FOR THE FIRST PORTION OF THE FORECAST REMAINS THE VERY  
STRONG STORM SYSTEM THAT WILL HIT AREAS TO OUR NORTH. HERE IN  
THE DISTRICT THE ONLY IMPACT WILL BE SLIGHTLY HIGHER 500 MB HEIGHTS  
BEHIND IT AS THE STORM MOVES EASTWARD ALONG THE CANADIAN BORDER.  
THE HIGHER HEIGHTS WILL HELP TO INCREASE THE DEPTH OF THE MARINE  
LAYER WHILE AT THE SAME TIME THE ONSHORE FLOW IS FORECAST TO  
INCREASE WHICH BRING MORE CLOUDS IN DURING THE OVERNIGHT HOURS AND  
MAKE THEIR AERIAL COVERAGE MORE WIDESPREAD. TEMPERATURES WILL  
CONTINUE TO RANGE FROM 60S RIGHT ON THE COAST TO THE 90S WELL  
INLAND.  
  
LOOKING INTO THE END OF THE WEEK INTO NEXT WEEK...A RIDGE WILL BUILD  
BACK INTO OUR AREA WHILE SLIGHTLY WARMER AIR TO THE SOUTHEAST WILL  
ALSO RETURN. A MAJOR HEAT WAVE CURRENT IS NOT ANTICIPATED ALTHOUGH  
INTERIOR SPOTS SHOULD SEE THEIR HIGHS GETTING BACK TO AT LEAST NORMAL  
LEVELS. IT IS IMPORTANT TO REMEMBER THAT AS WE START TO APPROACH  
SEPTEMBER ONE OF THE BIG CONCERNS IS ANY OFFSHORE WIND EVENTS THAT  
COULD CREATE DANGEROUS FIRE WEATHER CONDITIONS. GFS/DGEX/ECMWF ALL  
KEEP A GOOD ONSHORE FLOW ACROSS OUR AREA THROUGH NEXT WEEK WHILE THE  
THERMAL TROUGH REMAINS IN PLACE OVER THE INTERIOR. SO AT THIS TIME AN  
OFFSHORE WIND EVENT IS NOT EXPECTED.  
  
  
   
AVIATION...AS OF 5:15 AM PDT WEDNESDAY  
SOLID AREA OF STRATUS  
EXTENDS INTO SFO OAK AND SJC. THIS WILL KEEP STRATUS IN OVER THE  
SFO APPROACH ZONE THROUGH 19Z. STRATUS STILL SLOWLY SPREADING AND  
SHOULD GET INTO STS AROUND SUNRISE. INTERESTING STRATUS PATTERN  
AROUND MRY BAY AREA. LIGHT SOUTHERLY FLOW ALONG THE COAST HAS SPREAD  
LOW CLOUDS WELL INTO THE SNS VALLEY BUT HAS KEPT MRY CLEAR. STRATUS  
IS VERY CLOSE TO MRY AND SHOULD FILL IN OVER MRY AROUND SUNRISE.  
  
  
   
MTR WATCHES/WARNINGS/ADVISORIES  
  
       .TDY...SCA...PT PINOS TO PT PIEDRAS BLANCAS TO 20 NM AND  
                     SFO BAY.  
  
  
  
PUBLIC FORECAST: BELL  
AVIATION/MARINE: W PI  
  
NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO  
 
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