Hurricane-force winds, with gusts above 70 mph, will strike our coast today, with winds over the Puget Sound lowlands reaching 40-60 mph. Expect power outages and falling trees.
The winds along the coast will be particularly severe. The origin of the winds will be a very sharp trough/low pressure area. To illustrate, here is the 12-h forecast of sea level pressure (valid 4 PM). The solid lines are isobars, lines of constant pressure. Note the huge gradients of pressure (change of pressure with distance) over southwestern Washington, with the low/trough over Vancouver Island. Big changes in pressure produce strong winds.
If you are along the coast, this is a serious event, but a short one. Keep away from trees. Don't drive along tree-lined roads. Every storm like this, someone gets killed. The chances are slight for any one person, but why be the one smashed by a fallen fir?
And while you are thinking about the winds, don't forget to express your feelings about the proposed termination of KPLU, in the ill-advised sale to UW. More information here and here. This sale is marked by secrecy and disinformation by PLU and UW administrators.