Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 292136
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
236 PM PDT MON AUG 29 2016

.SYNOPSIS...A front will bring a little rain Tuesday night and
Wednesday. An upper trough will cross the area Thursday and
Friday for some showers. Weak high pressure aloft will bring drier
and slightly warmer weather next weekend.

&&

.SHORT TERM...An upper trough and an associated front between
130W and 140W will move slowly towards the area tonight and Tuesday
but rain will probably remain off the coast until Tuesday evening.
Low level onshore flow will increase for a bit more cloudiness and
a few degrees of cooling Tuesday. The front will push into the
interior on Wednesday with a little rain most areas - perhaps
holding off until late afternoon east of Puget Sound. Highs
Wednesday will cool another few degrees with the front. An upper
trough will remain just offshore on Thursday for showers and highs
in the 60s. Schneider

.LONG TERM...An upper trough will move over the area on Friday
with showers and highs in the 60s. Drier and slightly warmer
weather is likely for the weekend as the upper trough moves east
and northerly flow aloft develops. Model cross sections show a lot
of lingering moisture but there should be a least some sunshine.
An upper level disturbance will drop down from the northwest on
Monday for a chance or rain again. Schneider

&&

.AVIATION...Marine low cloud on the coast this evening will
spread inland overnight, and then burn off for most of the area
midday. There is a front offshore, and that will arrive Tuesday
night and Wednesday--for some rain.

KSEA...The marine low cloudiness will probably arrive in the early
morning hours, the 4km wrfgfs showed it reaching Seattle around
2am or 09z and then burning off by midday.

&&

.MARINE...A cold front just offshore will slowly move through the
coastal waters later on Tuesday and the wrfgfs shows areas of
southerly wind up to about 20 knots over the coastal waters. Winds
over the inland waters on Tuesday will be mainly in the 5-15kt
range. An upper level trough is going to be parked just offshore
through the end of the week for a period of cool unsettled
weather.

&&

.SEW Watches/Warnings/Advisories...
WA...None.
PZ...None.

&&

$$

www.weather.gov/seattle

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



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