Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 221604
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
904 AM PDT FRI JUL 22 2016

.SYNOPSIS...Showers will taper off across Western Washington this
morning as a trough moves east of the Cascades. A weak upper
ridge should bring sunny weather Saturday through Thursday with
warming temperatures.

&&

.SHORT TERM...An upper level trough over Washington brought showers
and thunderstorms to the area this morning. The trough axis has
now pushed east of the crest with showers mainly in the interior
and Cascades. It appears the thunderstorm threat has ended with
the winds aloft turning westerly. Showers will continue to taper
down through the rest of the morning with just isolated showers in
the afternoon. Temperatures will remain below normal today with
highs in the 60s to lower 70s.

An upper level ridge will start to build over Western WA this
weekend for drier and warmer conditions. There will be morning
low clouds Saturday morning but we should see some clearing in the
afternoon. Onshore flow is weaker on Sunday for generally less
clouds in the interior. Expect highs in the 70s to lower 80 on
Sunday, with upper 60s to low 70s on the coast. 33

.LONG TERM...Previous Discussion...As the new week
approaches...the ridge flattens out to a more zonal flow. Models
continue to show a shortwave that looks to move through on
Monday...but really makes no impact on the area. The
aforementioned zonal flow resumes through mid week before a
stronger ridge looks to lock into place over the Pacific
Northwest. Temperatures will continue to climb with the potential
for inland locations to see close to 90 degrees by the second half
of next week. So...for those who wondered where summer was...there
is that old phrase about being careful of what one wishes for. SMR

&&

.AVIATION...An upper level trof over the area this morning will
move into eastern WA about midday. High pressure aloft will follow
in its wake. The flow aloft will generally be from the NW.
Continued low level onshore flow.

The tstm threat has ended for western WA. The best chance of
tstms today will be e of the Cascades. Areas of MVFR CIGs/VSBYS
over the interior will improve to VFR by 1900 UTC. The Cascades
will be obscd (the Olympics, partially) this morning.

KSEA...CIGs are expected to improve to VFR by 1900 UTC. there may
be an OCNL MVFR CIGs between 1800 and 2000 UTC. SLY winds will
become WLY or WNW after 0000 UTC.

&&

.MARINE...High pressure centered offshore with lower pressure
east of the Cascades will result in onshore flow of varying
strength through this weekend.

&&

.SEW Watches/Warnings/Advisories...
WA...None.
PZ...Small Craft Advisory until 5 AM PDT Saturday for Central U.S.
     Waters Strait Of Juan De Fuca-East Entrance U.S. Waters
     Strait Of Juan De Fuca.

&&

$$

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You can see an illustrated version of this discussion at
www.weather.gov/seattle/gafd/latest_webafd.html


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