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

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000
FXUS66 KMTR 260052
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
552 PM PDT MON MAY 25 2015

.SYNOPSIS...COOLER THAN NORMAL CONDITIONS WILL CONTINUE FOR AT
LEAST ANOTHER DAY ALONG WITH WIDESPREAD CLOUDS. WARMER CONDITIONS
ARE EXPECTED DURING THE SECOND HALF OF THE WEEK...ESPECIALLY FOR
INLAND AREAS. HOWEVER...COASTAL AREAS WILL SEE ONLY LIMITED
WARMING AS AN ONSHORE FLOW REMAINS IN PLACE.

&&

.DISCUSSION...AS OF 3:00 PM PDT MONDAY...CLOUDS HAVE BURNED-OFF
INLAND TODAY ALTHOUGH STILL REMAIN FAIRLY WIDESPREAD ALONG
THE COAST. TEMPERATURES IN MOST SPOTS HAVE BEEN RUNNING CLOSE TO
WHERE WE WERE YESTERDAY AT THIS TIME ALTHOUGH A FEW POCKETS IN THE
NORTH BAY ARE RUNNING 3 OR MORE DEGREES COOLER THAN SUNDAY
AFTERNOON. WITH AN ONSHORE FLOW EXPECTED OVERNIGHT PLUS A MARINE
LAYER OVER 2500 FEET AND PLENTY OF UPSTREAM CLOUDS...LOOK FOR
ANOTHER ROUND OF WIDESPREAD OVERNIGHT CLOUDS TONIGHT. PATCHY
COASTAL DRIZZLE IS ALSO POSSIBLE. SIMILAR CONDITIONS ARE FORECAST
FOR TUESDAY AND TUESDAY NIGHT.

CONDITIONS ARE EXPECTED TO START TO IMPROVE ON WEDNESDAY AS A
RIDGE OF HIGH PRESSURE BUILDS IN FROM THE PACIFIC. 850 MB TEMPS
AND 500 MB HEIGHTS WILL RISE EACH DAY AT LEAST THROUGH FRIDAY
ALLOWING FOR HIGHS TO GO BACK TO AT LEAST NORMAL VALUES FOR INLAND
SPOTS. SOUTHERN INLAND SECTIONS OF MONTEREY COUNTY OVER TO SAN
BENITO COUNTY WILL LIKELY SEE NUMBER GOING TO ABOVE NORMAL
READINGS WITH HIGHS IN THE MID 80S TO LOWER 90S. AT THE COAST THE
WARM UP WILL BE MORE LIMITED DUE TO THE COOL SEA SURFACE
TEMPERATURES PLUS ONSHORE FLOW AT THE SURFACE. ON FRIDAY HIGHS
WILL RANGE FROM LOWER 60S AT SOME BEACHES UP TO LOWER 90S FOR THE
WARMEST INLAND SECTIONS. AROUND SANTA CLARA VALLEY...MOST PLACES
WILL BE IN THE UPPER 70S TO LOWER 80S. THE RIDGE WILL START TO
BREAK DOWN BY NEXT WEEK LEADING TO SOME COOLER READINGS.

BOTH OF THE LONGER RANGE OUTLOOKS...6 TO 10...AND 8 TO 14
DAY...INDICATE WARMER THAN NORMAL TEMPS WITHOUT ANY SUBSTANTIAL
RAINFALL. IF CORRECT IT WOULD MEAN THAT THE RIDGE HAS REBUILT OVER
OUR AREA.

&&

.AVIATION...AS OF 5:40 PM PDT MONDAY...FOR 00Z TAFS. STRATUS
CONTINUES TO BLANKET MUCH OF THE COAST...WITH LATEST BODEGA BAY AND
FT ORD PROFILER DATA INDICATING THE MARINE LAYER DEPTH IS
REMAINING NEAR 2500 FT. A BIT MORE CLEARING LATE THIS AFTERNOON
THAN 24 HRS AGO VICINITY MONTEREY BAY TERMINALS. ON THE OTHER
HAND LOW CLOUD COVERAGE IS EXTENDING INLAND EARLIER IN THE NORTH
SFO BAY REGION. FOR KSFO AND KOAK...MVFR CIGS PRESENTLY PREVAIL AT
BOTH...FOLLOWING A VFR WINDOW OF JUST A COUPLE OF HOURS AT THE
FORMER WHILE AT THE LATTER RESTRICTED CIGS CONTINUED THROUGHOUT
THE DAY. EXPECT IFR TO MVFR CIGS TO REDEVELOP AT ALL REMAINING TERMINALS
DURING THE EVENING. LATE AFTERNOON ONSHORE FLOW OF 10 TO 20 KT
WILL GRADUALLY DIMINISH OVER THE NEXT SEVERAL HOURS.

VICINITY OF KSFO...LATEST WEBCAM IMAGES SHOW MOSTLY CLOUDY SKIES
EXTENDING OVER THE TERMINAL FROM THE SAN BRUNO GAP...AND STARTING TO
SPILL INTO THE APPROACH. CIG HEIGHT PRESENTLY AT 1900 FT...IS
EXPECTED TO PROGRESSIVELY LOWER TO AROUND 1200 FT BY LATE THIS
EVENING. CURRENT WSW FLOW OF 15 KT GUSTING 22 KT WILL GRADUALLY
DIMINISH OVER THE NEXT FEW HOURS.

KSFO BRIDGE APPROACH...LOW CLOUDS SPILLING IN FROM THE TERMINAL
AND SHOULD REACH THE SAN MATEO BRIDGE WITHIN THE NEXT 1-2 HOURS.

MONTEREY BAY AREA TERMINALS...MVFR CIG REDEVELOPMENT HAS ALREADY
OCCURRED AT KMRY. HIGH CONFIDENCE WILL CONTINUE THROUGH THE NIGHT
AND TUESDAY MORNING...AND MODERATE CONFIDENCE WILL LOWER INTO THE IFR
RANGE BY LATE THIS EVENING. MVFR CIG ONSET AT KSNS EXPECTED BY
02Z...THEN SIMILARLY CONTINUING THROUGH THE NIGHT AND TUESDAY
MORNING. ONSHORE FLOW OF 10 TO 15 KT WILL DIMINISH DURING THE
EVENING HOURS.

&&

.MARINE...AS OF 3:00 PM PDT MONDAY...LIGHT TO MODERATE WEST TO
NORTHWEST WINDS PERSIST OVER THE CENTRAL CALIFORNIA COASTAL WATERS
OVER THE NEXT 24 HOURS. WINDS WEAKEN AND BACK TOWARDS THE WEST
THROUGH MIDWEEK THEN VEER BACK TOWARDS THE NORTHWEST AND INCREASE
LATER IN THE WEEK. PREDOMINATELY GENTLE SEAS THROUGH THE PERIOD.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TNGT...SCA...SF BAY NORTH OF THE BAY BRIDGE UNTIL 9 PM

&&

$$

PUBLIC FORECAST: BELL
AVIATION: BLIER
MARINE: DRP

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