NWS Forecast Area Discussion - San Francisco Area

FXUS66 KMTR 161208

Area Forecast Discussion
National Weather Service San Francisco Bay Area
508 AM PDT Thu Aug 16 2018

.SYNOPSIS...High pressure over the Desert Southwest will gradually
build westward and across California over the next few days. This
will result in a warming trend through Saturday, especially across
the interior. Temperatures will warm above normal in the inland
valleys and hills by Friday and Saturday. Cooling is then expected
by early next week.


.DISCUSSION...As of 3:33 AM PDT Thursday...Satellite imagery
shows coastal low clouds have spread locally into the San
Francisco Bay area as well as the North Bay valleys and into the
Monterey Bay. Current temperature trends are running slightly
cooler than yesterday at this time with mid 50s to lower 60s most
areas. High pressure aloft will begin building westward into
California beginning today with a warming trend expected through
Saturday. Highs today are forecast to be slightly warmer than
yesterday. Additional warming is expected through Saturday with
warmest inland areas peaking in the upper 90s to around 101.

Beginning on Sunday, the upper level ridge is progged to edge
eastward as an upper level trough digs down from the Pacific
Northwest. This is expected to usher in a cooling trend through at
least midweek.

&& of 5:00 AM PDT Thursday...Less stratus in the Bay
Area compared to yesterday. Large holes are seen on satellite in
the approach. Marine inversion has been diffuse overnight but it
may be strengthening as the airmass aloft warms up. Stratus today
could burn off by 18Z in the Bay Area...possibly sooner...but
should be more widespread tonight.

HRRR Vertically Integrated Smoke Model indicates smoke over the
area will be light today.

Vicinity of KSFO...MVFR cigs through 18-19Z. West winds gusting
to 25 kt after 22Z.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...Stratus is patchy again this morning. The
Salinas Valley is seeing much less stratus this morning. Cigs at
MRY and SNS will occasionally be SCT at times but cigs should
clear out completely after 16Z at SNS and 17Z at MRY.

&& of 2:39 AM PDT Thursday...A 1025 mb high centered
850 miles west of Cape Blanco will shift slightly east through
Friday. This will result in increasing northwest winds over the
northern outer waters Friday. Elsewhere winds will remain light
except for locally gusty winds over outer Monterey Bay and along
the Big Sur Coast. A long period southerly swell will arrive along
the coast this weekend.


     .Tday...SCA...SF Bay from 2 PM
             SCA...Mry Bay from 2 PM
             SCA...Pigeon Pt to Pt Pinos 0-10 nm from 2 PM
             SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm from 2 PM




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NWS MTR Office Area Forecast Discussion