I agree that Clinton will easily win WA in November. But let's dispel with the fiction that WA Democratic primaries, with zero delegates at stake, are more representative of voters in WA than caucuses. Also, we're not seeing votes here, we're seeing state delegates, so it's not accurate to say that turnout will be higher in the primary.
Not only that, anyone can show up to the caucus, but you have to register as a Democrat to vote in the primary. Why would independents bother registering for a meaningless primary?