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Area forecast discussion 
National Weather Service Seattle Washington
250 PM PDT Wednesday Aug 31 2016

Synopsis...an upper trough will bring showery weather through
Friday. Weak high pressure aloft will bring somewhat drier weather
Saturday through Monday. Wetter weather will return Tuesday and
Wednesday as weather systems arrive from the west.

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Short term...an upper trough will be over the area tonight and
early Thursday in the wake of a weak front. This period looks
like a relative lull in the weather with showers mostly at the
coast and in the mountains. Models are in fair agreement showing
shower activity becoming more widespread Thursday afternoon and
evening as an upper short wave moves through the base of the upper
trough. Showers will linger into Friday but the upper trough will
be shifting east of the area for an overall slow drying trend
later in the day. Saturday looks to at least start out mostly dry
but another upper low will drop down from the north for an
increasing chance of showers again. Schneider

Long term...an upper low will move southeast of the area on
Sunday with weak high pressure aloft bringing generally dry
weather. Models are in poor agreement starting around Monday with
either a system approaching the coast in northwest flow aloft or
brushing the north part of the area. Tuesday and Wednesday will
probably be wetter overall but again models differ with timing
and placement of weather systems. At least some showers seems like
a good bet but timing and location are pretty uncertain.
Schneider

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Aviation...a weakening cold front was moving through the area
this afternoon. The clouds may break up a bit for The Lowlands
this evening behind the front. Some more rain is likely Thursday
afternoon with another front. The mountains will be obscured at
times through Thursday.

Ksea...a chance of showers will continue through tonight. Rain
should develop Thursday afternoon as another weather disturbance
arrives.

&&

Marine...a weakening cold front moved through western Washington
today. Another front will arrive Thursday afternoon and evening--
the winds in the current wrfgfs do not support a Small Craft
Advisory but there will be onshore flow through the weekend and
stronger westerlies will develop in the Strait of Juan de Fuca.

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Sew watches/warnings/advisories...
Washington...none.
Pz...none.

&&

$$

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