If the Yellowstone super volcano erupts, it doesn't really matter where in the northern hemisphere you live - in fact life on _most_ of the earth's surface is going to suck for a few decades after that.
Seattle has valve nearby. If anyone ever buys some expensive gem and jams it into exotic machinery.. my bet is on these guys. So very dangerous place to live in..
[1]http://www.cnn.com/2016/02/11/us/cascadia-subduction-zone-ea...