324  
FXUS66 KMTR 021723  
AFDMTR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA  
923 AM PST FRI DEC 2 2016  
   
SYNOPSIS
 
DRY WEATHER WILL CONTINUE THROUGH THE WEEKEND, WITH  
AMPLE SUNSHINE AND MILD DAYTIME TEMPERATURES, BUT NIGHTS WILL BE  
CHILLY. BREEZY CONDITIONS CAN BE EXPECTED UP IN THE HIGHER HILLS  
OF THE BAY AREA FRIDAY MORNING. RAIN CHANCES RETURN EARLY NEXT  
WEEK.  
 

 
   
DISCUSSION...AS OF 08:30 AM PST FRIDAY
 
MAINLY CLEAR SKIES OVER  
THE REGION THIS MORNING ASIDE FROM A BAND OF HIGH LEVEL CLOUDS  
APPROACHING THE FAR NORTHERN PORTION OF THE NORTH BAY. THESE  
CONDITIONS ALLOWED FOR A COOL START TO THE DAY WITH TEMPERATURES  
IN THE 30S FROM THE SOUTHERN SANTA CLARA VALLEY SOUTHWARD.  
MEANWHILE, INCREASED NORTHERLY WINDS OVER THE NORTH BAY AND AROUND  
THE SAN FRANCISCO BAY KEPT TEMPERATURES SLIGHTLY WARMER, GENERALLY  
IN THE 40S TO LOW 50S RIGHT ALONG THE BAY AND OVER THE CITY.  
LITTLE CHANGE IS FORECAST FOR TODAY COMPARED TO YESTERDAY WITH  
TEMPERATURES WARMING INTO THE UPPER 50S TO LOWER 60S REGION-WIDE.  
BREEZY TO LOCALLY GUSTY WINDS WILL CONTINUE OVER THE NORTHERN  
PORTION OF THE REGION THROUGH THE AFTERNOON AND EARLY EVENING WITH  
THE STRONGEST WINDS IN THE HIGHER ELEVATIONS. THE ONGOING SHORT-  
TERM FORECAST REMAINS ON TRACK AND NO UPDATES ARE NEEDED AT THIS  
TIME.  
 

 
   
PREV DISCUSSION...AS OF 2:40 AM PST FRIDAY
 
SATELLITE IMAGERY  
SHOWS NO CLOUDS OVER THE DISTRICT AT THIS TIME, AND SURFACE  
OBSERVATIONS INDICATE GUSTY NORTHERLY WINDS ACROSS AREAS FROM  
ABOUT THE SOUTH SAN FRANCISCO BAY AREA NORTHWARD, WITH LIGHTER  
WINDS SOUTH OF THERE. AS A RESULT, TEMPERATURES ARE TRENDING  
WARMER ACROSS THE NORTHERN AREA BY 4 TO 8 DEGREES COMPARED TO  
YESTERDAY AT THIS TIME, WHILE LOCATIONS IN THE CALMER WIND AREAS  
ARE RUNNING COOLER BY AS MANY AS 11 DEGREES, WITH READINGS IN THE  
UPPER 30S AND 40S. DEW POINT TEMPERATURES ARE MUCH COOLER ACROSS  
THE BOARD WITH READINGS IN THE UPPER 20S TO THE UPPER 30S. THUS,  
EXPECT THE COOLEST TEMPERATURES THIS MORNING TO BE ACROSS THE  
SOUTHERN ZONES WHERE THERE IS LESS WIND, BUT EVEN ACROSS THE  
NORTHERN AREAS, ONCE WINDS DIE DOWN, TEMPS WILL FALL CLOSE TO THE  
DEW POINTS. UNDER SUNNY SKIES TODAY, EXPECT HIGH TEMPERATURES TO  
REACH INTO THE UPPER 50S TO MID 60S.  
 
DRY CONDITIONS ARE FORECAST TO PERSIST INTO THE WEEKEND WITH  
SLIGHTLY WARMER HIGH TEMPERATURES ON SATURDAY AND SUNDAY.  
OVERNIGHT LOWS WILL BE ON THE CHILLY SIDE, ESPECIALLY SATURDAY  
MORNING IN THE INLAND VALLEY LOCATIONS. STILL LOOKING LIKE  
CONDITIONS WILL BE ABOVE FREEZE WARNING CRITERIA, BUT PATCHY  
FROST IS POSSIBLE.  
 
A COLD UPPER LEVEL TROUGH IS PROGGED TO DIG SOUTH ALONG THE WEST  
COAST AND BRING COOLER WEATHER TO OUR AREA BEGINNING ON MONDAY.  
THE NORTHERLY TRAJECTORY IS NOT CONDUCIVE TO MUCH RAIN FOR OUR  
AREA, AND HAVE TRIMMED BACK POPS, LIMITING RAIN CHANCES TO MAINLY  
THE NORTH BAY ZONES FOR TUESDAY. ANOTHER MORE ROBUST TROUGH  
EXPECTED BY THE END OF NEXT WEEK COULD SPREAD RAIN FARTHER SOUTH  
BY NEXT FRIDAY OR SATURDAY, BUT THAT A WAYS OUT, SO CONFIDENCE IS  
LOW.  
 

 
   
AVIATION...AS OF 09:22 AM PST FRIDAY
 
OFFSHORE FLOW WILL  
CONTINUE TO PROVIDE VFR THROUGH THE PERIOD. A FEW HIGH CLOUDS WILL  
STREAM IN FROM THE NORTH, BUT NO IMPACTS. OFFSHORE FLOW WILL ALSO  
PRODUCE GUSTY WINDS, ESPECIALLY SFO.  
 
VICINITY OF KSFO... VFR. NORTHERLY WINDS 15-25 KT GUSTING TO 30  
KT DECREASING TO 15-20 KT THIS AFTERNOON.  
 
SFO BRIDGE APPROACH...SIMILAR TO KSFO.  
 
MONTEREY BAY TERMINALS...VFR WITH LIGHT OFFSHORE WINDS.  
 

 
   
MARINE...AS OF 08:30 AM PST FRIDAY
 
HIGH PRESSURE OFF THE WEST  
COAST AND LOWER PRESSURE INLAND WILL MAINTAIN GUSTY NORTHERLY  
FLOW ALONG THE CENTRAL COAST TODAY. WINDS WILL DECREASE NEAR  
SHORE TONIGHT BUT WILL PERSIST OVER THE OUTER WATERS THROUGH  
MONDAY. A LONG PERIOD SWELL TRAIN WILL MOVE INTO THE WATERS  
SATURDAY.  
 

 
   
MTR WATCHES/WARNINGS/ADVISORIES
 
 
.TDAY...SCA...SF BAY  
SCA...PT ARENA TO PT REYES 0-10 NM  
SCA...PT REYES TO PIGEON PT 0-10 NM  
SCA...PIGEON PT TO PT PINOS 0-10 NM  
SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM  
SCA...PT ARENA TO PIGEON PT 10-60 NM  
SCA...PIGEON PT TO PT PIEDRAS BLANCAS 10-60 NM  
 

 
 

 
 
PUBLIC FORECAST: RGASS  
AVIATION: MM  
MARINE: MM  
 
VISIT US AT WWW.WEATHER.GOV/SANFRANCISCO  
 
FOLLOW US ON FACEBOOK AND TWITTER AT:  
WWW.FACEBOOK.COM/NWSBAYAREA  
WWW.TWITTER.COM/NWSBAYAREA  
 
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