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

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FXUS66 KMTR 191620

Area Forecast Discussion
National Weather Service San Francisco Bay Area
920 AM PDT Fri Oct 19 2018

.SYNOPSIS...Sunny and warm today with a only a few degrees of
cooling through the weekend. More noted cooling returns early
next week as fronts pass to our north with increasing onshore flow
and a cooling airmass. Any light rain will likely stay north of
Sonoma county next week while high pressure builds over southern
and Central California by the second half of next week.

&& of 9:20 AM PDT Friday...Skies are mostly clear
across the district, and morning temperatures are running in the
chilly range with lower 40s to mid 50s last hour. These readings
are generally several degrees cooler than yesterday at this time.
Look for highs today to be the warmest of the week with widespread
80s across inland areas with 70s around the bays and 60s at to
the immediate coast.

The upper ridge responsible for the late-October warmth will edge
slightly eastward during the weekend which will result in a
gradual cooling trend. By early next week, an upper trough progged
to move across the Pacific Northwest will usher in more pronounced
cooling, but probably no rain for our area. Another system moving
through later in the week could bring light rain to the North Bay
late Thursday into Friday, but with another high pressure ridge
building over the Eastern Pacific at that time, it is looking
less likely with each new model run. When this ridge moves in over
California by the following weekend, much warmer temps are

&& of 4:55 AM PDT Friday...Compressed marine layer and
increased northerly gradient suppressing inland surge of stratus
deck this morning. Some low clouds are attempting to push into the
vicinity of KSTS and through the Golden Gate gap and may spread
into the sunrise hours. Offshore winds in the Salinas Valley are
depleting clouds there, with clearing skies possible over
KMRY/KSNS thru morning if winds remain offshore. Dry setup
continues tonight with generally VFR expected. Generally light
offshore winds during am hours and occasionally breezy onshore
winds during the pm hours especially near the coast.

Vicinity of KSFO...VFR. Brief increase in clouds north of the
airport possible (FEW-SCT 600-800ft) thru sunrise hours.
Occasionally breezy onshore PM winds. VFR tonight.

SFO Bridge Approach...Same as KSFO.

Monterey Bay Terminals...Offshore winds have ejected low clouds
from the Salinas Valley into the Monterey Bay, thus generally VFR
with patchy areas of fog. If winds shift onshore early this
morning, could see a brief return of low clouds thru sunrise
hours. Light winds, occasionally breezy onshore near the coast
late this afternoon.

&& of 8:38 AM PDT Friday...High pressure over the Great
Basin and the eastern Pacific will weaken through the weekend and
early next week. Generally winds will be light to locally breezy
northwesterly and swell moderate period mixed northwesterly and




MARINE: Canepa

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