Have you talked to the registrars office specifically? They handle all residency issues. Here's the website
Residency for Tuition There's even a survey to take that should tell you if you qualify.
Overall if you still have a WA license, registered to vote, car tags, and not filing taxes independent then it's safe to say you're a WA resident. It gets a bit weird if any of those are NH registered.
Usually around thanksgiving-mine came the week of thanksgiving (3 years ago) I know last year came I think about a week earlier. So usually around that time frame. IS people usually hear and then out of state