As Thanksgiving travel gets underway, state officials are urging drivers to prepare for changing and potentially hazardous conditions over the mountain passes.

WSDOT says heavy holiday traffic is expected through mid-week and recommends allowing extra travel time, noting that Wednesday will likely be the most congested travel day.

The National Weather Service has issued a Winter Weather Advisory for the Cascades, warning of snow, slick roads, and reduced visibility at higher elevations.

Blewett Pass (US-97): A mix of rain and snow is expected Wednesday, with highs in the 30s and light accumulations into the evening. Rain and snow showers continue through Thanksgiving Day and night, with temperatures dropping into the upper 20s to low 30s.

Stevens Pass (US-2): Wednesday brings rain an

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