Small Craft Advisory 135, NWS San Francisco Bay Area, CA

Area Forecast Discussion
National Weather Service San Francisco Bay Area
143 PM PDT Sun Jul 5 2020

.SYNOPSIS...Temperatures are warm and conditions are dry with breezy
onshore winds. Monday afternoon high temperatures will be slightly
cooler as onshore flow increases with a likely return of the
marine layer for the immediate coastline. Temperatures are
expected to be similar day- to- day midweek before warming likely
late in the week and into next weekend.

&&

.DISCUSSION...as of 01:42 PM PDT Sunday...Temperatures Sunday are
running similar to yesterday given the high pressure still located
over the Bay Area region. A few observations in the North Bay are
slightly warmer, but generally speaking the pattern and conditions
are consistent to yesterday. Winds remain on onshore and have
started to increase this afternoon. Despite the onshore direction,
coupled with the dry conditions over inland areas, the winds could
make fire containment challenging. However, as an update to the
previous discussion, it appears that the Park Fire is now improved
to 50% contained and crews and stopped its forward progress. Sky
conditions remain clear as the nearest bit of cloud cover is over
100 miles off the California coast.

The pattern changes slightly beginning overnight tonight, being
driven by an upper level trough currently northwest of the state of
Washington. As it moves down the Pacific coast tonight, expect a
deeper marine layer and a return of low clouds around the Monterey
Peninsula. Winds will remain onshore but increase overnight as well,
reaching farther inland. These cooler northwesterly winds will drive
5-7 degrees cooler temperatures on Monday, with isolated locations
seeing a 10 degree cool down.

As the trough moves through, these cooler temperatures in the 70s
and 80s will remain through the midweek. Winds will remain onshore
and be breezy. In a return to the weather pattern from last week,
high pressure to the southeast will once again build by the end of
the week. The return of higher pressure puts a warming trend in the
forecast for the weekend. Drier conditions prevail with no
precipitation forecast.

&&

.AVIATION...as of 11:00 AM PDT Sunday...for 18Z TAFS. VFR
conditions prevail over the region this morning with onshore flow
beginning to increase. Expecting generally west to northwest winds
of around 12 kt or greater at most terminals this afternoon with
locally stronger gusts in excess of 20 kt in the typically windy
locations. Wind speeds diminish after sunset with VFR conditions
likely to prevail for most sites in and around the San Francisco
Bay Area, yet can't rule out few/sct low clouds around sunrise
Monday. Meanwhile, higher confidence in the return of MVFR/IFR
ceilings around the Monterey Bay terminals early Monday morning
as the marine layer returns.

Vicinity of KSFO...VFR. West winds increasing to 20-25 kt with
gusts to 30-34 kt after 21Z. Winds trend weaker late in the night
and into Monday morning, yet will remain moderate onshore.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...VFR. West winds 10-15 kt with gusts to
20 kt in the Salinas Valley after 20Z. Onshore winds diminish late
in the evening and overnight with MVFR/IFR ceilings developing
around or after 09z Monday.

&&

.MARINE...as of 01:42 PM PDT Sunday...A 1030 mb high centered 1000
miles west of Cape Mendocino will move closer to the coast through
Monday. As a result, gusty  northwest winds will continue over the
coastal waters into  midweek. Gale force gusts are possible along
the Big Sur coast  Monday afternoon and evening. Strong northwest
winds will generate steep fresh swell resulting in hazardous seas
conditions. A long- period southerly swell will continue through
Monday before swell  periods begin to subside.

&&

.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
             SCA...Mry Bay until 9 PM

&&

PUBLIC FORECAST: DK
AVIATION: RGass
MARINE: RGass

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