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

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FXUS66 KMTR 222052

Area Forecast Discussion
National Weather Service San Francisco Bay Area
152 PM PDT Tue Aug 22 2017

.SYNOPSIS...Dry weather will prevail today with temperatures
near to slightly below normal for the middle of August. Low
clouds and fog will persist in the overnight and early morning
near the coast and in the valleys the next several days. An inland
warming trend is likely late in the week and into the upcoming
weekend due to strengthening high pressure.

&& of 1:51 PM PDT Tuesday...This morning`s overcast
conditions over most of the San Francisco Bay Area have
transitioned to a mostly clear afternoon for much of the area. Low
clouds are still lingering from Point Reys northward as well as
the Monterey Peninsula. When all is set and done this afternoon,
high temperatures should generally top out in the 60s and low 70s
along the coast and upper 70s to perhaps the low 90s for interior
locations. Expect the warmest locations to be in interior San
Benito and Monterey Counties with mid 90s likely.

Synoptically an upper level low remains centered around 150 miles
offshore from Big Sur around 35N 124W. Models advertise this low
to push onshore by midweek as a broader longwave trough approaches
coastal British Columbia. Not expecting much day-to-day change in
temperatures for any particular location during this time with
high temperatures running near seasonal normals. This changes for
Friday as models show a ridge beginning to build over the Four
Corners and expanding west over the weekend. Interior areas will
return back to the 90s and 100s as a result. Long range guidance
suggests the ridge will remain parked over the Southwest with
above normal temperatures likely continuing into next week.


.AVIATION...As of 10:50 AM PDT Tuesday...For 18z TAFs. Surface
high off the Central Coast mitigated impact of overnight marine
layer, with IFR TO MVFR cigs focused primarily over the San
Francisco Bay area. Cigs have retreated offshore/mixed out with
only a few thin layers of stratus left over the Bay Bridge
corridor between downtown San Francisco and Oakland. Look for
breezy afternoon winds and a later return of a shallower marine
layer tonight.

Vicinity of KSFO...VFR today. Light to moderate west winds will
prevail this afternoon, sustained 12-17 kt, with occasional gusts
possible. Borderline IFR-MVFR SCT-BKN late tonight into sunrise

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...VFR today. Surface high offshore kept
marine clouds at bay (in the bay) overnight, however, look for
LIFR to IFR cigs later tonight. Light winds will pick up out of
the west/northwest this afternoon, 9-13 kt.

&& of 01:46 PM PDT Tuesday...Light to moderate winds
through midweek, with locally stronger winds through coastal gaps
during the afternoons. Building high pressure from the west will
bring stronger northerly winds and steep fresh swell. No
significant long period swell through the upcoming week.


     .Tngt...SCA...SF Bay until 9 PM




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