Here's a forecast of roughly where to expect smoke on Thursday (red triangles are fire locations)
Western Washington: Northeast winds have picked up. Depending on activity of the Buck Creek fire, light smoke could settle between Mount Vernon and Tacoma between now and Friday. Again, mostly between 7PM and 10AM, and not expected to be worse than Moderate. A new fire within JBLM is likely to cause some smoke within the Spanaway- Olympia- Centralia triangle.
Smoke from fires in Olympic National Park, clearly visible on satellite images, is likely to impact the Aberdeen area, resulting in Moderate air.
There is a Heat Advisory through 8PM on Friday and a Fire Weather Watch for all of Thursday afternoon for the west side. Here's the map from http://www.esri.com/services/disaster-response/wildfire