Technical NOAA Weather Discussion

FXUS66 KMTR 251753

Area Forecast Discussion
National Weather Service San Francisco Bay Area
1053 AM PDT Sun Jun 25 2017

.SYNOPSIS...Gradual cooling is forecast to continue through
Monday, mainly for inland areas. Little change is expected near
the coast. Look for areas of night and morning low clouds and fog
followed by sunny afternoons. Modest warming is expected during
the second half of the week. But for the most part, temperatures
will be near seasonal averages through the week.


.DISCUSSION...As of 9:10 AM PDT Sunday...Widespread clouds at the
coast and adjacent inland areas will eventually give way to mostly
sunny conditions later in the day. Latest models continue to
indicate cooler conditions today as the ridge of high pressure
progresses to the east. Inland locations that had been over 100
will be back in the 80s to mid 90s with coastal spots remaining in
the 60s to lower 70s.

Current forecast is on track. No major updates planned.

.PREVIOUS DISCUSSION...Low clouds have developed well inland
overnight, similar to last night. Also, there are reports of
patchy fog and drizzle near the coast. Onshore surface pressure
gradients are about the same as 24 hours ago and the marine layer
depth has held steady at about 2000 feet. For the most part,
expect today to be much like Saturday with low clouds clearing
inland by midday while coastal areas see only partial afternoon
clearing. Afternoon highs near the coast will be close to what
they were yesterday while inland areas are expected to be slightly

Cooling will continue into Monday as a weak upper
trough...currently centered offshore along 130W...moves inland
across northern California. Temperatures by Monday will be about 3
to 5 degrees cooler than normal, which is a big change from the
triple-digit heat inland areas endured during the prolonged heat
event that ended just a few days ago. Little change is expected
going into Tuesday.

The trough will move off to our east by midweek and a weak upper
ridge is then forecast to develop over California during the
second half of the week. This will result in modest warming from
Wednesday through Saturday. But for the most part, temperatures
will remain close to seasonal averages through the week.
Precipitation is not expected other than patchy night and morning
coastal drizzle during the next few days.


.AVIATION...As of 10:53 AM PDT Sunday...For 18Z TAFs...Marine
layer depth remains at about 1800 feet with slow burn-off across
western TAFs. Clearing expected most areas by early afternoon with
a strong seabreeze. Cigs return again tonight.

Vicinity of KSFO...MVFR cigs through roughly 19Z. Satellite
indicates low clouds continuing to feed into the gap with strong
onshore flow. Expect brief clearing at the terminal by 19Z but
early return (04Z) of MVFR cigs changing to IFR by 08Z.

SFO Bridge Approach...Similar timing, although low couds could
circulate around the bay given the strong onshore push.

Monterey Bay Terminals...LIFR cigs for KMRY until 19Z, then
chaning to IFR. Clearing possibly by 20Z with an early return.
Light west winds.

&& of 8:32 AM PDT Sunday...High pressure off the West
Coast will maintain northerly winds over the coastal waters
through next week. Winds will be locally stronger along the
immediate coast. Seas will be small with a dominant southerly


     .Tday...SCA...SF Bay from 1 PM
             SCA...Pigeon Pt to Pt Pinos 0-10 nm from 1 PM
             SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm from 1 PM




Visit us at

Follow us on Facebook, twitter, and youtube at:

Prepared by Weather at: Sun Jun 25 12:30:02 PDT 2017
From the National Weather Service