FXUS66 KMTR 131742
AFDMTR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA
942 AM PST SAT MAR 13 2010
.DISCUSSION...AS OF 8:52 AM PST SATURDAY...THE MORNING IS OFF TO A
CLEAR AND SUNNY START WITH COOL MORNING MINS EXPECTED TO GIVE WAY
TO HIGHS IN THE UPPER 50S AND 60S. A NORTHERLY SURFACE PRESSURE
GRADIENT WILL BRING GUSTY WINDS TO NEAR-COASTAL AREAS AS WELL AS
HIGHER TERRAIN SPOTS TODAY.
HIGH PRESSURE ALOFT BUILDING OVER THE STATE BY SUNDAY WILL WEAKEN
THE NORTHERLY FLOW AND ALLOW TEMPERATURES TO WARM SEVERAL DEGREES
OVER TODAY'S TEMPS. THE HIGH PRESSURE WILL KEEP CONDITIONS DRY...IN
FACT...THROUGH THE ENTIRE FORECAST PERIOD. EVEN THE TAIL EDGE OF A
SYSTEM PROGGED TO MOVE ACROSS THE PACIFIC NORTHWEST ON TUESDAY IS
EXPECTED TO REMAIN WELL TO THE NORTH OF OUR AREA. THE EFFECTS WILL
LIKELY BE LIMITED TO A SLIGHTLY COOLING OF TEMPERATURES AND AN
INCREASE IN BREEZES AS THE UPPER TROUGH MOVES THROUGH. A SLIGHT
CHANCE OF SHOWERS IS MENTIONED IN THE NORTH BAY ZONES FOR TUESDAY...
WILL REEVALUATE THIS BY THE AFTERNOON PACKAGE...BUT RIGHT NOW RAIN
IS NOT LOOKING LIKELY.
MEDIUM RANGE MODELS BUILD THE HIGH PRESSURE RIDGE STRONGLY OVER THE
WEST COAST FROM MIDWEEK ON FOR DRY CONDITIONS AND WARMING
TEMPERATURES.
&&
.AVIATION...AS OF 9:41 AM PST SATURDAY...HIGH PRESSURE IS BUILDING
OVER THE EASTERN PACIFIC PROVIDING MOSTLY CLEAR CONDITIONS OVER THE
TERMINALS TODAY. THE LATEST VISIBLE SATELLITE IMAGE IS SHOWING A
FEW CUMULUS CLOUDS AROUND THE AREA BUT OTHERWISE CLEAR.
VICINITY OF KSFO...VFR CONDITIONS THROUGH TONIGHT. WINDS WILL BE
AROUND 5 KT OUT OF THE NORTH THIS MORNING BECOMING WEST 15 TO 20 KT
BY THIS AFTERNOON.
KSFO BRIDGE APPROACH...SAME AS KSFO.
MRY BAY AREA TERMINALS...VFR CONDITIONS THROUGH TONIGHT. WINDS WILL
BE AROUND 5 KT OUT OF THE NORTHWEST THIS MORNING BECOMING WEST 10 TO
15 KT BY THIS AFTERNOON.
PROPOSED POLICY CHANGE...EFFECTIVE 15Z TUESDAY APRIL 6TH 2010 THE SAN
FRANCISCO BAY AREA OFFICE AT MONTEREY WILL BEGIN 3-HOURLY TAF
ISSUANCES FOR KSFO. THESE INTERMEDIATE TAFS AT 03Z...09Z...15Z...AND
21Z WILL BE ISSUED AS AMENDMENTS TO THE TAFS ISSUED AT 00Z...06Z...
12Z...AND 18Z. THE INTERMEDIATE TAFS WILL BE ISSUED DURING A 20-
MINUTE WINDOW BETWEEN 10 MINUTES BEFORE THE DESIGNATED ISSUANCE HOUR
AND 10 MINUTES AFTER THE HOUR. COMMENTS ON THIS PROPOSED RULE-MAKING
WILL BE ACCEPTED TO MARCH 19TH. COMMENTS CAN BE ADDRESSED TO THE
WEBMASTER AT THE NWS AT MONTEREY AT WWW.WEATHER.GOV/SANFRANCISCO.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
.TDA...SCA...ALL COASTAL WATERS.
...SCA...SF BAR FOR ROUGH BAR.
&&
$$
PUBLIC FORECAST: SSA
AVIATION/MARINE: LARRY
NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO
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