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

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FXUS66 KMTR 250950

Area Forecast Discussion
National Weather Service San Francisco Bay Area
250 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 2:50 AM PDT Sunday...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 cooler.

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 10:45 PM PDT Saturday...For 06Z TAFs...A 1600
ft marine layer coupled with moderate onshore flow will result in
cigs across most area terminals by morning. High clouds streaming
in from the south will continue to push north and out of the area
with little consequence. Low clouds will scatter out across most
terminals around 17z.

Vicinity of KSFO...IFR cigs will prevail through the night then
scatter out around 17z Sunday morning. Moderate west winds around
10 to 15 kt will gradually ease to around 10 kt overnight. West
winds will increase once again Sunday afternoon to around 15 to 20
kt with the onset of the seabreeze.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...LIFR cigs are in for the night. Cigs and
vsbys are forecast to drop to LIFR/VLIFR after 11z tonight.
Conditions will begin to improve after 15z Sunday morning with low
clouds scattering out around 17z Sunday morning. Light west

&& of 8:57 PM PDT Saturday...Light northwesterly winds
and seas will prevail across the coastal waters through the
weekend and into early next week. Strongest winds are expected
along the Big Sur coast where a coastal jet is forecast to set up
and prevail through the weekend.


     .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




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