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He's probably cruising for does. I wouldn't sit there unless you've also got a good concentration of does in the area. The bucks can cover a lot of ground just before, and during, the rut, so there's no telling where he will be, and when.
Heron,I see your up here in whatcom too. I hit it pretty hard all weekend and didn't see a single deer, I don't ever recall that happening before. I would say if u see him a couple days in a row or find some rubs then he will be back, otherwise he's probably just passing through. Although this is when I have seen most mature bucks, ones I have not seen in the area before, they show up one day and gone the next.