Where are you??? Are you out there close? It'd be just like you to get up close to it...
I was in Spokane for May 18th. It was quite scary to see the sky go pitch black at 2:30 in the afternoon.
IF, and again I say IF there's a "major" eruption with significant ashfall, prevailing winds would head for Portland/Vancouver area. If you get ash, for goodness' sakes...don't drive in it. If it gets in your engine, you've just made your local mechanic a very happy person because of all your money he's going to get. I know from experience.
Then again, all this could be for nothing. Volcanoes can be like that.