KPDX is going to overperform me thinks. Rare situation where that Arctic trough COMES hard and south, leaving KPDX dry and cold and likely with a skiff of snow on the ground. Not going to be much of a north-favored event unless the Arctic front overperforms in the Sound. KSEA will eke out some measurable wintry mix Saturday evening with the sfc front coming out of the east. Happened last February, too.
I would watch for some cvn-enhanced precip and maybe an early changeover over the Portland metro area during the front as moisture will be more plentiful in the Willamette Valley during that time. Just better timing overall down south. That Arctic front will push south too so @TigerWoodsLibido will get to see his first true Arctic front in a while, with precip and all, no matter the type. And maybe he'll notch another subfreezing high on the season Monday.