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

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FXUS66 KMTR 261010

Area Forecast Discussion
National Weather Service San Francisco Bay Area
310 AM PDT TUE JUL 26 2016

.SYNOPSIS...A warming trend remains on track for the inland areas
beginning today and persisting through late week as high pressure
builds in from the Desert Southwest. However, typical cool summer
conditions will prevail along coast. A cooling trend is
anticipated for the upcoming weekend as an upper level trough
develops off of the Pacific Northwest Coast.

&& of 3:09 AM PDT Tuesday...Building high pressure
is compressing the marine layer this morning as indicated by the
Fort Ord profiler which is showing a marine layer depth of just
under 1000 feet. The compressed marine layer is resulting in low
clouds, ceilings around 200 feet, along the coast and patchy
dense fog in the Monterey area. The current IR satellite fog
product continues to show low clouds over the coastal waters,
stretching into the Salinas Valley. The heat signature associated
with the Soberanes Fire is also evident on the fog product.

The 0000Z ECMWF and GFS20 have initialized well with the current
synoptic weather pattern and remain in good agreement through
roughly Saturday, building the Four Corners high to 594DM. As the
high pressure builds 850MB temperatures heat up. In fact 850MB
temperatures are forecast to reach 25 to 26C today and 26 to 27C
Wednesday and Thursday. This translates to hot inland temperatures
reaching into the mid to upper 90s. The hottest areas will be in
interior Monterey and San Benito counties where low 100s will be
common. Pinnacles National Monument is expected to reach a high of
107 today and tomorrow before cooling to 106 on Thursday. In
addition to the heat the 0000Z GFS20 is also indicating that some
monsoon moisture will begin to move into southern Monterey
Wednesday. At this point the atmosphere does not look unstable
enough to support convection, but we will continue to monitor this
moisture as it moves into the area. A cooling trend remains on
track for the weekend as a trough of low pressure begins to swing
into the Pacific Northwest.

&& of 10:46 PM PDT Monday...Southerly flow aloft will
continue to transport wildfire smoke to the Bay Area through
Tuesday. This will coincide with a gradually weakening surface
high over NorCal through Tuesday night the result being lighter
sea-breezes and increasing the probability that restrictions to
visibilities extend through mid-week. Conditions also favor
slantwise visibility reductions near sunrise and sunset over the
next couple days due to smoke and haze. Mid-high level cloudiness
on the southwestern side of the strong mid-upper level high over
the Desert SW may reach the forecast area by Tuesday evening into

Vicinity of KSFO...VFR/MVFR. Visibilities likely to be reduced
in hazy/smokey conditions Tuesday. Seabreeze redevelops Tuesday
afternoon and evening, wind speeds under 20 knots.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...Cigs/vsbys IFR tonight due to mix of stratus,
fog, and smoke. Stratus and fog scatter out Tuesday morning, but hazy
and smokey conditions persist Tuesday.


.FIRE of 3:09 AM PDT Tuesday...The marine layer has
compressed to around 900 feet this morning. Although relative
humidity recoveries have been good below a 1000 feet tonight, max
relative humidity above 1000 feet remains poor. Surface winds over
the waters along the Big Sur coast are anticipated to be around 10
mph and out of the north. Generally light and variable winds, 4
to 8 mph, are anticipated over Santa Lucia Mountain and Los Padres
National Forest. This will result in another day of smokey
conditions for the Monterey area.

&& of 03:09 AM PDT Tuesday...High pressure over the
Eastern Pacific will maintain moderate northerly winds over the
coastal waters. Locally gusty winds will be possible over the
outer waters north of Point Reyes. Winds will gradually diminish
as the week progresses. A mixed swell will also impact the
coastal waters through the week.


     .Tday...SCA...Pt Arena to Pigeon Pt 10-60 nm
             SCA...SF Bay from 11 AM




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