Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA

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000
FXUS66 KMTR 212359
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
359 PM PST SUN DEC 21 2014

.SYNOPSIS...LIGHT RAIN AND DRIZZLE WILL DIMINISH THROUGH THE
OVERNIGHT HOURS AS HIGH PRESSURE BUILDS OVER THE EASTERN PACIFIC.
HIGHER THAN AVERAGE TIDES WILL RESULT IN MINOR COASTAL FLOODING
OVER THE NEXT SEVERAL DAYS. TEMPERATURES WARM THROUGH MIDWEEK
BEFORE A STORM BRUSHING THE AREA BRINGS TEMPS BACK DOWN TO
SEASONAL NORMALS.

&&

.DISCUSSION...AS OF 3:00 PM PST SUNDAY...MOIST FLOW REMAINS ACROSS
OUR ENTIRE CWA THIS HOUR WITH MANY SPOTS SEEING DEW POINTS OF 55
TO 60 AND RH READINGS OF 80 TO 95 PERCENT. IN ADDITION...LATEST
ONE HOUR RAINFALL TOTALS SHOWS QUITE A FEW SPOTS IN OUR AREA
REPORTING TIPS. DECIDED TO JUST DO A MINOR GRID UPDATE TO ADD
DRIZZLE TO ALL LOCATIONS ALONG WITH A SLIGHT CHANCE OF RAIN FOR
MUCH OF THE NORTH BAY.

A RIDGE OF HIGH PRESSURE WILL BUILD INTO CALIFORNIA OVER THE NEXT
SEVERAL DAYS ALLOWING FOR WARMING ALONG WITH DRYER CONDITIONS AND
FEWER CLOUDS EACH DAY. TUESDAY APPEARS TO BE THE WARMEST OF THE WEEK
AS 850 MB TEMPS JUMP FROM BY ABOUT 8C TO THE 15-16 RANGE ON
TUESDAY AND THE RIDGE AXIS GOES ACROSS. WITH PLENTY OF SUNSHINE
HIGHS WILL MOVE INTO THE MID 60S TO LOWER 70S.

COOLER WEATHER WILL RETURN ALONG WITH A VERY SLIGHT CHANCE FOR
SHOWERS WEDNESDAY (CHRISTMAS EVE) AS AN INSIDE SLIDER SKIRTS CLOSE
TO TTHE NORTHERN PORTION OF THE CWA. ANY RAINFALL SHOULD BE VERY
LIGHT WITH THE LARGER IMPACT BEING TEMPERATURES COOLING BACK
CLOSER TO NORMAL. OVERNIGHT LOWS ARE ALSO EXPECTED TO DROP DUE TO
DRIER AIR. WE WILL LIKELY SEE 30S BACK IN INTERIOR VALLEY
LOCATIONS.

LONGER RANGE GUIDANCE FAVORS DRIER THAN NORMAL CONDITIONS OUT TO
JANUARY 4TH. CURRENTLY NO SIGN OF ANY MAJOR STORMS IMPACTING OUR
AREA THE NEXT TWO WEEKS.

&&

.AVIATION...AS OF 3:57 PM PST SUNDAY...HIGH PRESSURE WILL BUILD
OVER NORCAL DURING THE PERIOD. THERE`S PLENTY OF LEFTOVER SURFACE
TO LOW LEVEL MOISTURE AND INCREASING AIR MASS STABILITY WILL LEAD
TO AREAS OF IFR CEILINGS AND VISIBILITIES. LOW LEVEL WINDS BECOME
MORE NORTHERLY LATE TONIGHT THROUGH MONDAY WHICH SHOULD HELP WITH
CLEARING ON MONDAY.

VICINITY OF KSFO...IFR CEILING PRESENTLY REPORTED AND FORECAST TO
CONTINUE THROUGH 03Z. MVFR 03Z-09Z FOLLOWED BY IFR.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...MVFR...BUT LOCALIZED IFR POSSIBLE THROUGH
THE EVENING. LIGHT WINDS.

&&

.MARINE...AS OF 3:00 PM PST SUNDAY...NORTHWEST WINDS WILL
GRADUALLY INCREASE OVER THE SOUTHERN AND OUTER WATERS THROUGH
TONIGHT AND PERSIST ON MONDAY AS HIGH PRESSURE BUILDS OFF THE
CALIFORNIA COAST. KING TIDES WILL IMPACT THE COAST AND INLAND BAYS
THROUGH TUESDAY. KING TIDE IMPACTS FOR SEAFARING VESSELS WILL
OCCUR PRIMARILY DURING LOW TIDES...WITH THE POSSIBILITIES OF BOAT
KEELS TOUCHING HARBOR BOTTOM...STRONG CURRENTS IN HARBOR
ENTRANCES...AND ADDITIONAL BREAKING WAVES OVER OFFSHORE REEFS.
&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TNGT...COASTAL FLOOD ADVISORY...COASTAL AND BAY SHORE AREAS
             SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM
             SCA...PT PINOS TO PT PIEDRAS BLANCAS 10-60 NM
             SCA...PIGEON PT TO PT PINOS 10-60 NM FROM 3 AM
             SCA...ROUGH BAR ADVISORY FOR SF BAR UNTIL 8 PM

&&

$$

PUBLIC FORECAST: BELL
AVIATION: CANEPA
MARINE: RGASS

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