Mountains don't need to be big to create their own weather
We've had a number of examples lately where some of of the region's regular-sized hills have done a good job of at least generating their own cloud layers.
The clouds are formed by the winds racing up the hillsides as the local air mass sits right on the edge of saturation. Rising air cools and while it's certainly not a dramatic cooling over such a short distance, it's just enough in these examples to make its own clouds and fog.
The photo above of Tillamook Head just south of Seaside's beach shows the marine air along the ocean was just on the cusp of saturating, and the onshore wind was pushed up the side of the hill and condensed into fog.
Here is a great example of Whidbey Island making its own weather, courtesy of SkunkBayWeather.com
And here is an example from 2012 of the fog rolling up and over Bainbridge Island;
The photo gallery above also has some other recent examples.