Areas to the east of the Cascades have a fairly high chance of seeing thunderstorms Wednesday through Saturday evening.  Keep that in mind if your travels take you over there as there could likely be a good soaking rain those days. 

As for the Cascades themselves, thunderstorms look most likely closer to the crest of the Cascades.  Places like Detroit Lake should stay storm free with only a light shower or two possible.

Sunday will kick off a nice dry stretch for both Central Oregon and the Cascade Range.

The coast will see a bit of drizzle Thursday morning and much of the day Saturday.  The rest of the weekend and into next week should be dry.