You have to put your brain in 3D when thinking of east flow. East flow is driven by pressure. Temperature changes through a horizontal plane and a vertical plane effect and are effected by pressure. When there is higher pressure east of the crest and lower pressure west of the crest you get east flow. Air trapped in the easter basin gets pulled up and west when these pressure differences occur. Throw in terrain induced flow patterns and it gets interesting. Air pulled up through the Stevens Pass gap cools as it rises, mix that with cool air aloft in the Northeast portion of the state- walla snow with 4-5000' freezing levels. That probable confused you as much as it did me.
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