Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 272132
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
235 AM PDT Thu Jul 27 2017

.SYNOPSIS...Clouds will continue to burn off through evening and
then redevelop overnight. Friday will have areas of morning clouds
then afternoon sun and warmer temperatures. The weekend will have
sunny skies and warmer temperatures. A warming trend should continue
into next week and the morning low clouds and fog should be mainly
confined to the coast and around the Strait of Juan de Fuca.

&&

.SHORT TERM...Areas that have clouds in the lowlands should see
clearing through evening and then the clouds will redevelop
overnight--but Friday will see the clouds break out faster and it
will be warmer. Saturday should be sunny with just some shallow
marine layer clouds--mainly just on the coast and in the Strait of
Juan de Fuca in the morning. Sunday might have a little more
marine air, but temps only falling off a touch. 500mb heights will
be up around 588 dam over the weekend and 850mb temps will be around
15c over Puget Sound so we should be back to the weather we had the
past few days.

.LONG TERM...The air mass should warm into early next week, with
possibly Tuesday being the warmest day, but it is a little early to
say if the ridge will peak one day or the next. Highs should get
well into the 80s, maybe around 90 in the warmer spots--but not near
the coast. Gradients will continue to give a pretty good sea breeze
and thermal low pressure will remain east of the Cascades, so the
coast will probably just stay in the 70s.

&&

.AVIATION...An upper trough over the area will weaken tonight and
Friday with westerly flow aloft. At the surface, high pressure
will be offshore with lower pressure inland. The air mass is
stable.

MVFR low clouds will continue to thin and eventually scatter later
this afternoon or early this evening. MVFR low clouds will
redevelop later tonight for most areas.

KSEA...MVFR low clouds should thin and scatter in the next couple of
hours. MVFR low clouds are expected to redevelop late tonight.
Southwest wind 4-8 knots will become northerly this evening.
Schneider

&&

.MARINE...Onshore flow will continue for the next several days
with high pressure offshore and lower pressure inland. Expect
at least small craft advisory west winds each night in the
Central and Eastern Strait of Juan De Fuca. Gales cannot be
completely ruled out the next few evenings in the Strait but it
looks marginal each day. Schneider

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 5 AM PDT Friday for Central U.S.
     Waters Strait Of Juan De Fuca-East Entrance U.S. Waters
     Strait Of Juan De Fuca.

     Small Craft Advisory from 5 PM this afternoon to 5 AM PDT Friday
     for Northern Inland Waters Including The San Juan Islands.

     Small Craft Advisory from 5 PM this afternoon to 3 AM PDT Friday
     for Admiralty Inlet.

&&

$$

www.weather.gov/seattle

You can see an illustrated version of this discussion at
www.wrh.noaa.gov/sew/gafd/latest_webafd.html


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