PZZ560-565-032230-
 PIGEON POINT TO POINT PINOS TO 10 NM-
 POINT PINOS TO POINT PIEDRAS BLANCAS TO 10 NM-
 833 AM PDT FRI SEP 3 2010
 
 .TODAY...W WINDS 5 TO 15 KT. WIND WAVES 1 TO 3 FT. NW SWELL 3 TO
 5 FT AT 10 SECONDS. PATCHY DENSE FOG.
 .TONIGHT...NW WINDS 10 TO 20 KT. WIND WAVES 2 TO 4 FT. NW SWELL
 3 TO 5 FT AT 9 SECONDS. PATCHY FOG. 
 .SAT...NW WINDS 10 TO 20 KT. WIND WAVES 2 TO 4 FT. NW SWELL 3 TO
 5 FT AT 9 SECONDS. PATCHY FOG. 
 .SAT NIGHT...NW WINDS 10 TO 20 KT. WIND WAVES 2 TO 4 FT. NW SWELL
 4 TO 6 FT. PATCHY FOG. 
 .SUN...NW WINDS 10 TO 20 KT. WIND WAVES 2 TO 4 FT. NW SWELL 5 TO
 7 FT. S SWELL 3 FT. PATCHY FOG. 
 .LABOR DAY...NW WINDS 5 TO 15 KT. WIND WAVES 1 TO 3 FT. NW SWELL
 4 TO 6 FT. PATCHY FOG. 
 .TUE...NW WINDS 5 TO 15 KT. WIND WAVES 1 TO 3 FT. NW SWELL 3 TO
 5 FT. PATCHY FOG.  
 
 

 
 FXUS66 KMTR 031816
 AFDMTR
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
 1116 AM PDT FRI SEP 3 2010
 
 ...UPDATED AVIATION DISCUSSION...
 
 .DISCUSSION...AS OF 8:15 AM PDT FRIDAY...HIGH PRESSURE SURFACE AND
 ALOFT COVERS MOST OF THE WEST COAST THIS AM.  MARINE LAYER IS
 VARYING BETWEEN 800 AND 1500 FT DEPENDING ON SENSOR YOU LOOK AT.
 FT ORD PROFILER SHOWING CLOSE TO 800 FT WHILE SAN CARLOS SODAR
 SHOWING MULTIPLE LAYERS WITH LOWEST NEAR 800 FT BUT ANOTHER WELL
 DEFINED LAYER AT 1500 FT. SOME DENSE FOG NEAR MONTEREY BAY SO HAVE
 ISSUED A NOWCAST UNTIL 9 AM FOR THIS AREA.  LAST SEVERAL HOURS HAVE
 SEEN STRATUS FORMING IN THE SOUTH AND EAST BAY BUT TOPS VERY
 SHALLOW...NEAR 500 FT. AIRCRAFT LANDING AT SFO ARE ABLE TO FLY OVER
 THE CLOUDS AND MAINTAIN PARALLEL RUNWAY OPERATIONS. THIS MIGHT CHANGE
 IF LOWER STABLE LAYER LIFTS AND CLOUD LAYER COULD RISE BEFORE BURNOFF
 LATER IN THE MORNING.  ONSHORE GRADIENT HAS INCREASED TO OVER 2 MB
 THIS AM AND FORECAST TO BE OVER 3 MB THIS PM. WOULD EXPECT
 SIGNIFICANT COOLING NEAR THE COAST TODAY AND SOME COOLING INLAND AS
 SHALLOW MARINE LAYER AND STRONGER ONSHORE FLOW ALLOWS MARINE AIR TO
 PENETRATE INLAND. CURRENT FORECAST APPEARS ON TRACK SO NO UPDATES.
 
 LATEST NAM SHOWS MARINE LAYER WILL DEEPEN A LITTLE MORE SAT ALLOWING
 SOME FURTHER COOLING INLAND AND DEEPENING THE MARINE LAYER MOST
 LIKELY TO 1500 FT.  THIS WILL ALLOW DEEPER INLAND PENETRATION OF
 LOW CLOUDS TONIGHT AND TOMORROW MORNING. SUNDAY LOOKS TO BE JUST A
 FEW DEGREES COOLER AS AS ONSHORE FLOW INCREASES SLIGHTLY AND MARINE
 LAYER NEAR 1800 FT.  SO LOW CLOUDS WILL PENETRATE LITTLE FARTHER
 INLAND AND TAKE A LITTLE LONGER TO BURN OFF SUNDAY MORNING. THIS
 WEEKEND COOLING IS IN RESPONSE TO UPPER TROUGH MOVING THROUGH THE
 PACNW. BY MONDAY THIS TROUGH HAS DROPPED INTO THE NORTHERN GREAT
 BASIN AND HIGH PRESSURE BUILDING INTO PACNW AND NEVADA WILL END THE
 COOLING TREND AND PROVIDE SOME OFFSHORE FLOW FOR A WARMER LABOR
 DAY. TEMPERATURES WILL BE BACK INTO THE MID 90S INLAND AND MID 70S
 TO LOW 80S NEAR THE COAST AND COASTAL VALLEYS.  SO SHOULD BE A
 GREAT LABOR DAY FOR OUTSIDE ACTIVITIES.
 
 EXTENDED...THE WARMING TREND WILL BE VERY SHORT LIVED AS ANOTHER
 TROUGH DROPS DOWN THE PACNW COAST MONDAY NIGHT INTO TUESDAY.  500 MB
 HEIGHTS DROP CONSIDERABLY TUE WITH VERY STRONG ONSHORE FLOW FORECAST.
 SO EXPECT SIGNIFICANT COOLING AND EXTENSIVE LOW CLOUDS AND FOG COAST
 AND INLAND TUE MORNING WITH SLOW CLEARING BACK TO THE COAST DURING
 THE DAY.  UPPER TROUGH IS FORECAST TO DROP SOUTH SOMEWHERE FROM SFO
 TO SAC DEPENDING ON MODEL.  THIS TRAJECTORY MAY BE SUFFICIENT TO
 BRING SUFFICIENT COLD AIR ALOFT TO POSSIBLY MIX OUT THE MARINE
 LAYER BY LATE WED.  AS THIS TROUGH BEGINS TO EJECT EAST ON THUR AND
 FRI WILL SEE A SLOW WARMING TREND AND A RELAXATION OF THE ONSHORE
 FLOW.
 
 
 &&
 
 .AVIATION...AS OF 11:00 AM PDT FRIDAY...WIDESPREAD STRATUS CONTINUES
 TO COVER MUCH OF THE COASTLINE...WITH A NARROW STRIP INTO SF BAY.
 EXPECT THE STRATUS IN THE BAY TO CLEAR BY EARLY AFTERNOON. THE MARINE
 LAYER WILL DEEPEN TONIGHT...AND WITH INCREASING ONSHORE FLOW WOULD
 EXPECT STRATUS TO MOVE INTO THE COASTAL VALLEYS EARLIER TONIGHT.
 
 .VICINITY OF KSFO...FORECASTING VFR CONDITIONS FOR KSFO THROUGH
 TONIGHT. CIGS TO 800 FT ARE EXPECTED TO DEVELOP AROUND 07Z TONIGHT...
 AND LOWER TO 600 FT BY 12Z SATURDAY MORNING. OTHERWISE...GUSTY NW
 WINDS WILL BE POSSIBLE AGAIN THIS AFTERNOON.
 
 .KSFO BRIDGE APPROACH...VFR TODAY THROUGH TONIGHT.
 
 .MRY BAY AREA TERMINALS...VFR CONDITIONS EXPECTED THE REMAINDER
 OF TODAY AND INTO THE EVENING. CIGS TO 700 FT BY 04Z THIS EVENING...
 WITH VIS DOWN TO 3SM BY 08Z TONIGHT.
 
 &&
 
 .MTR WATCHES/WARNINGS/ADVISORIES...
      .TDA...SCA...SFO BAY.
 
 &&
 
 $$
 
 PUBLIC FORECAST: REYNOLDS
 AVIATION/MARINE: MHS