GFS has been going back and forth between something like that and the extreme cold. Latest one is cold again, the sounding for West Seattle shows five consecutive days (nights of 11th to 15th) with lows in low to mid teens (15°F, 13°F, 14°F, 13°F, 14°F). But just two runs back the lowest was 33°F. So I’m just hoping (please please) that the mild runs are correct, along with the GEM. Though the latest GEM does show that cold air mass getting close, just not quite breaking through to us. That looks like a preposterous temperature gradient:
