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

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FXUS66 KMTR 251010

Area Forecast Discussion
National Weather Service San Francisco Bay Area
310 AM PDT Tue Jul 25 2017

.SYNOPSIS...Look for similar conditions today compared to
yesterday. Temperatures will begin to warm later in the week as a
ridge of high pressure rebuilds into our region.

&& of 3:00 AM PDT Tuesday...Overnight the marine
layer has continued to deepen and is now over 2,500 feet. With a
weak onshore flow at the surface clouds should continue to
increase into the morning hours. Similar to yesterday, clouds will
burn-off back to the coast by the afternoon with highs in the
upper 70s to the upper 80s for most inland spots while 60s will
again be common at coastal spots.

Starting tomorrow the upper level low centered overhead will begin
to dissipate and progress off to the northeast as a ridge of high
pressure rebuilds into our region. This will lead to temperatures
warming into the weekend. Although the increases will vary from
location to location, by Thursday places away from the coast will
mostly be 7 to 12 degrees warmer than today while coastal areas
will see only minor temperature increases.

Longer range guidance indicates that the ridge will remain in
place and likely strengthen going into next week. Previous runs
had indicated 500 MB heights possibly at 600 DM, however newer
guidance has backed off a bit. Regardless, looks like very warm
weather can be expected later this week through at least the
middle of next week. No chance of rain or showers through the

&& of 10:53 PM PDT Monday...While southerly flow
persists along the coast resulting in some terminals such as KSFO
remaining clear the deep 2500 ft marine layer has allowed stratus
to fill in through coastal valleys and gaps. Low clouds will
persist through the night with status clearing to the coast by

Low to moderate confidence.

Vicinity of KSFO...VFR conditions likely through tonight as a
result of a southerly flow along the coast. A slight possibility
of stratus returning late tonight. Confidence is low.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...MVFR cigs will low to IFR after midnight
with the possibility of LIFR cigs early Tuesday morning over
KMRY. Clearing is expected by noon. Light and variable winds
expected overnight.

&& of 02:45 AM PDT Tuesday...A weak area of low pressure
off the coast will result in southerly flow along the immediate
coast. West and northwest winds will re- develop on Wednesday as
high pressure builds over the eastern Pacific. A longer period
southerly swell will impact the region  later this week as several
tropical disturbances move west from  Mexico.


     .Tday...SCA...SF Bay from 12 PM




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