Thursday night update:
The mid and southern Willamette Valley still on track for snow Friday. Should begin in the morning and continue into the afternoon.
East winds are increasing in the Portland area which is now under a Wind Advisory for gusts up to 50 mph. This will create dangerously low wind chils, in the single digits, and could even bring a few tree limbs down.
A Winter Weather Advisory is up for the Coast, Coast Range and Cascade foothills, with a Winter Storm Warning on the central coast around Newport.
It's from there southeast to Eugene and south to Ashland where the heavy snow will fall. Here's a snowfall breakdown:
Portland area: flurries, some light snow, no accumulation.
Salem area: Trace to an inch of snow.
South of Salem: 1-2"
South of Corvallis: 1-4"
It all begins after midnight and ends Friday afternoon.
And then, Arctic reinforcements roll in, with the coldest air yet arriving for Saturday. It'll be clear, with strong NE winds creating dangerous wind-chills.
Cold clear weather continues through the weekend. As warmer air and rain move in Tuesday, it may begin as snow or ice in Portland, and certainly in the Gorge.