Arctic air is headed for Oregon and temperatures will get dangerously cold starting Friday.
Highs in the Portland area are expected to be below freezing Saturday through Monday and lows will be in the teens.
The National Weather Service has a Winter Storm Watch posted for the Portland-Vancouver area, Columbia River Gorge and the western foothills of the Cascades.
A Winter Storm Warning is posted for the Cascades.
Significant snowfall is possible in the Portland area Friday night into Saturday.