A Winter Weather Advisory has been issued by the National Weather Service for a light mix of wintry precipitation likely to cause some travel issues Sunday. After several days of cold offshore flow, a weak low pressure system will approach the region from the south tonight and Sunday. This system will spread light to briefly moderate precipitation across western Oregon Sunday morning, likely before temperatures have had a chance to recover from a chilly night in the 20s tonight. While snow and ice accumulations are not expected to be heavy, several days of cold weather will likely cause roads to be very receptive to snow and ice accumulation Sunday. This will likely cause some travel issues during a busy travel day Sunday as people return home from the holidays.
Areas affected include the Central Coast Range, Central Willamette Valley, South Willamette Valley, the Northern Oregon Cascade foothills, the Cascade foothills in Lane County, and the cities of Veneta, Salem, McMinnville, Eugene, Springfield, Corvallis, Albany, Lebanon, Sweet Home and Cottage Grove.
The advisory is in effect from 4:00am to 4:00pm Sunday for a mix of snow, sleet and freezing rain. Light snow or sleet will spread north into the Eugene area early Sunday morning, continuing northward as the morning progresses. Snow or sleet will eventually change to freezing ain as the day progresses. Temperatures may rise slightly above freezing in some areas as precipitation tapers off Sunday afternoon.
Snow accumulations of 1 to 3 inches are possible. The best chance for snow accumulation to occur will be near the east slopes of the Coast Range, such as near McMinnville, Dallas and Corvallis. Ice accumulation generally around one tenth of an inch. Roads will become slick due to snow or ice accumulation Sunday. This includes primary roads such as Interstate 5, as well as Highways 18, 20, 22, 34, 99W and 126.