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

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FXUS66 KMTR 200026
AFDMTR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
526 PM PDT WED JUN 19 2013

.DISCUSSION...AS OF 02:36 PM PDT WEDNESDAY...SUNNY SKIES ACROSS THE
DISTRICT HAVE ALLOWED AFTERNOON TEMPERATURES TO WARM SEVERAL
DEGREES ABOVE CONDITIONS ON TUESDAY. AFTERNOON TEMPERATURES ARE
RUNNING IN THE 60S AND 70S...WITH SOME LOWER 80S IN THE WARMEST
INTERIOR AREAS. COMPARED TO YESTERDAY AT THIS TIME THE ONSHORE
SURFACE PRESSURE GRADIENT IS CONSIDERABLY WEAKER WITH ONLY 1.9 MB
BETWEEN SFO AND SAC (COMPARED TO 4.4 MB YESTERDAY AT THIS TIME)
AND 5.1 MB FROM SFO TO WMC (VERSUS 13.1 MB.) CONSEQUENTLY...WIND
SPEEDS ARE MUCH LOWER THAN YESTERDAY AT THIS TIME AT MOST LOCATIONS.

EXPECT A LITTLE MORE IN THE WAY OF COASTAL STRATUS AND FOG
OVERNIGHT AS BOUNDARY LAYER RH LEVELS INCREASE. WEAK HIGH
PRESSURE ALOFT IS PROGGED TO BRIEFLY BUILD OVER THE WEST COAST FOR
A GRADUAL WARMING TREND BEGINNING ON THURSDAY AND PERSISTING UNTIL
SATURDAY WHEN MAX TEMPS ARE FORECAST TO PEAK...WITH HIGHS RANGING
FROM THE 70S AND 80S...WITH LOWER 90S IN WARMEST SPOTS.

TEMPERATURES ARE FORECAST TO COOL OFF BEGINNING ON SUNDAY AS AN
UPPER TROUGH RE-ESTABLISHES ALONG THE COAST. LATEST RUNS OF BOTH
THE GFS AND ECMWF BRING RAIN CHANCES TO NORTHERN CALIFORNIA
SUNDAY-TUESDAY. WENT AHEAD AND ADDED A SLIGHT CHANCE OF RAIN TO
THE NORTH BAY FOR MONDAY AND TUESDAY.

SUMMER BEGINS AT 05:04Z ON JUNE 21ST...OR 10:04 PM PDT JUNE 20TH.

&&

.AVIATION...AS OF 5:25 PM PDT WEDNESDAY...VFR CONDITIONS EXPECTED
THROUGH THE FORECAST PERIOD. GUSTY WINDS WILL CONTINUE THROUGH
THIS EVENING THEN GRADUALLY EASE OVERNIGHT.

VICINITY OF KSFO...VFR CONDITIONS EXPECTED THROUGH THE FORECAST PERIOD.
MODERATE TO STRONG WEST WINDS THIS AFTERNOON...WITH GUSTS OVER
30 KT ANTICIPATED.

KSFO BRIDGE APPROACH...SIMILAR TO KSFO.

MONTEREY BAY AREA TERMINALS...VFR CONDITIONS EXPECTED THROUGH THE
FORECAST PERIOD. MODERATE ONSHORE WINDS THIS AFTERNOON AND EVENING.


&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .TNGT...SCA...PT ARENA TO PT REYES 0-10 NM
             SCA...PT REYES TO PIGEON PT 0-10 NM
             SCA...PIGEON PT TO PT PINOS 0-10 NM
             SCA...PT ARENA TO PIGEON PT 10-60 NM
             SCA...PIGEON PT TO PT PIEDRAS BLANCAS 10-60 NM
             SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM FROM 3 AM
             GLW...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM UNTIL 3 AM
             SCA...SF BAY UNTIL 9 PM
             SCA...MRY BAY UNTIL 9 PM

&&

$$

PUBLIC FORECAST: SIMS
AVIATION/MARINE: CW

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