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

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000
FXUS66 KMTR 202203
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
302 PM PDT WED AUG 20 2014

.SYNOPSIS...LOOK FOR ANOTHER ROUND OF LOW CLOUDS WITH PATCHY FOG
OVERNIGHT TONIGHT. CONDITIONS WILL IMPROVE AGAIN TOMORROW WITH MOSTLY
SUNNY CONDITIONS INLAND AND PARTLY CLOUDY SKIES LIKELY NEAR THE
COAST. ONLY SLOW WARMING IS EXPECTED AWAY FROM THE COAST THURSDAY
THROUGH SUNDAY.

&&

.DISCUSSION...AS OF 3:00 PM PDT WEDNESDAY...SOUTHERN HALF OF THE
CWA HAS CLEARED OUT NICELY THIS AFTERNOON WHICH HAS ALLOWED
TEMPERATURES TO REBOUND EVEN AT THE COAST. EVEN AROUND MONTEREY
BAY SOME SPOTS ARE NEAR 70 DEGREES. FOR THE NORTHER HALF, A
DIFFERENT STORY WITH A SOUTHERLY FLOW CONTINUING TO BRING A NEARLY
STEADY STREAM OF CLOUDS ESPECIALLY FOR THE NORTH BAY. STILL
WIDESPREAD 60S THROUGH MUCH OF NAPA AND SONOMA COUNTIES. CONSTANT
WEST TO NORTHWESTERLY SURFACE FLOW TONIGHT WILL HELP TO USHER IN
ANOTHER ROUND OF CLOUDS OVERNIGHT. MORE PATCHY FOG IS LIKELY ALONG
THE COAST AND MOST VALLEYS ALTHOUGH WITH THE MARINE LAYER NOT
FORECAST TO BE AS DEEP, THE AMOUNT SHOULD BE LESS THAN THE PAST
FEW DAYS.

SYNOPTICALLY AN UPPER LEVEL LOW WILL DIVE DOWN FROM CANADA AND
PROGRESS INTO NORTHERN NEVADA LATE FRIDAY WHILE A RIDGE OF HIGH
PRESSURE STARTS TO BUILD OUT OVER THE PACIFIC. AT THE SAME TIME
THE SURFACE FLOW WILL SHOW LITTLE CHANGE WITH MORE ROUNDS OF
OVERNIGHT CLOUDS MAINLY AT THE COAST EXPECTED. WORTH NOTING THAT
LATE FRIDAY INTO SATURDAY A MINOR OFFSHORE WIND EVENT IS POSSIBLE
OVER THE NORTH BAY AS NE WINDS UP TO 15 KT AT 925 MB SET UP AS THE
UPPER LOW MOVES TO OUR EAST.

LONGER RANGE GUIDANCE CONTINUES TO INDICATE THE RIDGE OF HIGH
PRESSURE OUT OVER THE PACIFIC WILL REBUILD ACROSS OUT AREA. TEMPS
WILL WARM BY NEXT WEEK AND GO BACK TO ABOVE NORMAL LEVELS FOR MANY
SPOTS. DID DECIDE TO PUSH THE GIRDS A FEW DEGREES ABOVE BC VALUES
TO REFLECT THE WARMING. LATEST GUIDANCE DOES NOT BRING MOISTURE
INTO OUR AREA FROM TROPICAL STORMS DUE TO A MORE WESTERLY TRACK.

&&

.AVIATION...AS OF 10:30 AM PDT WEDNESDAY...WIDESPREAD LOW CLOUDS
AGAIN THIS MORNING THOUGH THE MARINE LAYER HAS DECREASED TO 2800
FEET. LIGHT SOUTHERLY FLOW WILL TURN LIGHT TO MODERATE ONSHORE
THIS AFTERNOON. EARLY RETURN OF STRATUS IS EXPECTED THIS EVENING.

VICINITY OF KSFO...STRATUS IS BEING REINFORCED BY SOUTHWEST FLOW.
EXPECTING CLEARING IN THE NEXT HOUR...THEN VFR THROUGH EARLY EVENING.
SOUTH TO SOUTHWEST WINDS THIS MORNING TURN WEST THIS AFTERNOON.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...MVFR CIGS THROUGH EARLY AFTERNOON.
MOSTLY LIGHT WEST WINDS. STRATUS RETURNS THIS EVENING.

&&

.MARINE...AS OF 3:00 PM PDT WEDNESDAY...MODERATE NORTHWESTERLY
WINDS EXPECTED ACROSS THE NORTHERN OUTER WATERS TONIGHT AND OVER
PORTIONS OF SAN FRANCISCO BAY THIS AFTERNOON. OTHERWISE GENERALLY
LIGHT WINDS AND SEAS WILL CONTINUE. A MODERATE PERIOD SOUTH SWELL
WILL MOVE INTO THE REGION LATER THIS WEEK DUE TO STORMS IN THE
TROPICAL PACIFIC.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TNGT...SCA...PT ARENA TO PT REYES 10-60 NM FROM 8 PM UNTIL 3 AM
             SCA...SF BAY NORTH OF THE BAY BRIDGE UNTIL 9 PM

&&

$$

PUBLIC FORECAST: BELL
AVIATION: AC
MARINE: AC

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