UPDATE 9:10am
The National Weather Service has updated its forecast for tonight and while the top wind gusts have dropped a little the potential for power outages and damage to trees and adjacent property remains high. This storm system is part of a full west coast of stormy weather but it should be calmer and be gone by mid morning.
Here's the NOAA weather forecast as of this morning:

...HIGH WIND WATCH REMAINS IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT...

* SOME AFFECTED LOCATIONS INCLUDE...SEATTLE...TACOMA...EVERETT... BELLINGHAM...OLYMPIA.

* TIMING...HIGH WINDS ARE POSSIBLE FROM LATE THIS AFTERNOON THROUGH TONIGHT.

* WIND...SOUTH TO SOUTHWEST WINDS 30 TO 40 MPH WITH GUSTS TO 65
MPH COULD DEVELOP. HIGH WINDS ARE MOST LIKELY TO OCCUR IN THE
NORTHWEST INTERIOR INCLUDING WESTERN WHATCOM COUNTY...THE SAN JUAN ISLANDS...THE ADMIRALTY INLET AREA...AND WESTERN SKAGIT
COUNTY. THERE IS ALSO A CHANCE FOR HIGH WINDS IN THE PUGET SOUND REGION AND SOUTHWEST INTERIOR...BUT THE OCCURRENCE IS LESS LIKELY THERE.

* IMPACTS...WINDS THIS STRONG CAN TOPPLE LARGE TREES. POWER OUTAGES ARE LIKELY TO OCCUR AND MAY BE WIDESPREAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A DAMAGING
WIND EVENT. FORECASTS SHOULD BE MONITORED CLOSELY.

Original Post
The National Weather Service has issued a High Wind Watch that takes effect Thursday morning through the evening. They are predicting Southwest winds of 30 to 40 mph with gusts to 65 and gusts of up to 75 possible. The threshold for hurricane force winds is frequent gusts of 64 knots (74 mph). The potential for power outages and downed trees is very high. Calmer weather is expected Friday as conditions dry out.

Here's the NOAA High Wind Watch

..HIGH WIND WATCH IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING...

* SOME AFFECTED LOCATIONS INCLUDE...SEATTLE...BELLEVUE...TACOMA... OLYMPIA...BREMERTON...EDMONDS...AND BREMERTON.

* TIMING...WINDS WILL INCREASE OVER SOUTHWEST WASHINGTON THURSDAY MORNING...THEN QUICKLY SPREAD NORTHWARD. CURRENT TIMING SUGGESTS HIGH WINDS ARE POSSIBLE DURING THE THURSDAY AFTERNOON AND EVENING COMMUTE.

* WIND...SOUTH TO SOUTHWEST WINDS OF 30 TO 40 MPH WITH GUSTS TO 65 MPH COULD DEVELOP...INCLUDING IN THE PUGET SOUND I-5 URBAN CORRIDOR. IN THE MOUNTAINS...GUSTS TO OVER 75 MPH ARE POSSIBLE...EXCLUDING THE MOUNTAIN PASSES WHICH MAY REMAIN SOMEWHAT SHELTERED.

* IMPACTS...WINDS THIS STRONG CAN TOPPLE LARGE TREES... ESPECIALLY GIVEN THE SATURATED SOILS FROM RECENT RAINFALL. POWER OUTAGES ARE LIKELY TO OCCUR AND MAY BE WIDESPREAD.