FXUS66 KMTR 231742
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA
940 AM PST WED DEC 23 2009

.DISCUSSION...AS OF 9:00 AM PST WEDNESDAY...CLEAR SKIES ALONG WITH
COLD TEMPERATURES ACROSS THE DISTRICT. TEMPERATURES RANGE FROM THE
UPPER 20S AND 30S IN THE WIND PROTECTED VALLEYS TO THE 30S AND 40S
ELSEWHERE. NOT A VERY PLEASANT MORNING AT THE TOP OF MT DIABLO WHERE
THE TEMPERATURE IS 36 WITH 32 MPH SUSTAINED WINDS.

WITH A RIDGE BUILDING ALONG THE COAST IT WILL REMAIN DRY RIGHT
THROUGH THE END OF THE WEEK. WINDS WILL CONTINUE TO DECREASE AS THE
UPPER LOW OVER THE SOUTHERN ROCKIES LIFTS NE...CAUSING PLENTY OF
HEADACHES AND POTENTIAL TRAVEL PROBLEMS TO THE CENTER OF THE COUNTRY
CHRISTMAS EVE AND CHRISTMAS DAY. HOWEVER...FOR OUR PART OF THE WORLD
THE ONLY FLY IN THE OINTMENT FOR THE REMAINDER OF THE WEEK WILL BE
THE OVERNIGHT VALLEY FOG. WITH TEMPS NEAR OR AT FREEZING THERE COULD
BE SOME FREEZING FOG...HOWEVER IT DOESN'T LOOK LIKE A WIDESPREAD
FREEZE EVENT SO NO HEADLINES.

MEDIUM RANGE MODELS CONTINUE TO HAVE PROBLEMS WITH THE UPCOMING
WEEKEND. THE 00Z GFS WAS DRY...NOW THE 12Z GFS HAS SOME RAIN FROM SAT
AFTN THROUGH SUNDAY. THE 00Z CANADIAN IS QUITE WET WHILE THE 00Z
ECMWF IS IN THE MIDDLE. WILL WAIT TO SEE WHAT THE 12Z ECMWF SHOWS
BEFORE MAKING ANY SIGNIFICANT CHANGES.

&&

.AVIATION...AS OF 9:40 AM WEDNESDAY...HIGH PRESSURE WITH CLEAR SKIES
NEXT 24-36 HOURS. LIGHT NORTHERLY WIND FLOW WITH DIURNAL NIGHT TIME
DRAINAGE WINDS FOR THE SANTA CLARA AND SALINAS VALLEYS.

VICINITY OF KSFO...VFR CONDITIONS THROUGH WEDNESDAY. LIGHT WINDS.

KSFO BRIDGE APPROACH...SAME AS KSFO.

MRY BAY AREA TERMINALS...VFR CONDITIONS THROUGH WEDNESDAY. LIGHT
WINDS.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
   .TDA...NONE

$$

PUBLIC FORECAST: MHS
AVIATION/MARINE: RWW

NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO