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

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FXUS66 KMTR 191721

Area Forecast Discussion
National Weather Service San Francisco Bay Area
1021 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 10:21 AM PDT Friday...The marine layer remains
compressed with IFR stratus ceilings confined to the coastline
from Sonoma county to San Mateo county. A small patch of IFR
stratus drifted to KSFO, but it should scatter out between 1730z
and 18z. Otherwise near high confidence VFR forecast today. Local
inland stratus intrusions redeveloping tonight and Saturday

Vicinity of KSFO...Low stratus cloud patch expected to scatter out
by 18z. VFR.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...VFR except patchy low stratus ceilings
returning tonight and Saturday morning.

&& 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





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