Portland, OR – Up to 12 inches of snow is expected across mountain corridors, creating hazardous travel conditions through Thursday morning.
According to the National Weather Service in Portland, a Winter Weather Advisory remains in effect from 4 a.m. Monday until 4 a.m. PST Thursday for the Oregon and Washington Cascades, Coast Range mountains, and Cascade foothills.
Forecasters expect 2 to 5 inches of snow Monday into Monday night in the northern and central Oregon Cascades and Coast Range. Another 2 to 5 inches is forecast Tuesday into Tuesday night. Snowfall increases again Wednesday, with an additional 2 to 5 inches in Oregon and 2 to 9 inches possible in the Washington Cascades and higher elevations. Total accumulations could reach 12 inches in some mountain areas.
Roads, especially bridges and overpasses, are expected to become slick. Travel along Interstate 5 near mountain passes, U.S. Highway 26 near Government Camp, OR 58 near Willamette Pass, and US 12 in Washington may be impacted during periods of heavier snowfall.
Snowfall is expected to become lighter and more isolated Tuesday before intensifying again Wednesday. Officials advise drivers to carry tire chains, emergency supplies, and check TripCheck or WSDOT road reports before traveling.
Students, freight drivers, and early-week commuters using Cascade passes may face delays during peak snowfall windows.
The advisory includes communities such as Government Camp, Santiam Pass, Willamette Pass, Mount St. Helens, and surrounding foothill areas.
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