National Weather Service United States Department of Commerce

Below-freezing temperatures will continue through Thursday due to the cold, dry airmass before gradually warming Friday into the weekend and next week.
A weather system moving in overnight, will squeeze the pressure gradient in the Grande Ronde Valley and the Northern Foothills of the Blue Mountains of Oregon. This will create winds sustained at 25-40 MPH with the highest gusts around 50 to 60 MPH. High profile vehicles will be impacted the most, but with the snow in the forecast visibilities will also be heavily impacted at times. Drifting snow may also impact accumulations. Make sure to check the forecast and Tripcheck.com before you travel.
A weather system moving in overnight will bring advisory levels of snow accumulation to a majority of our Oregon zones, as well as the Blue Mountain and Blue Mountains Foothills zones of Washington. These conditions could impact travel times, reduce visibility, and make surfaces slick. In the Grande Ronde Valley and the Oregon Blue Mountains Foothills the snow will combine with high winds and heavily impact visibility with blowing snow and cause drifting. Make sure to check the forecast and road conditions before you travel.