Portland, Oregon – Travelers heading into the Cascade Mountains of Oregon and southwest Washington are being urged to prepare for dangerous winter conditions starting early Friday, as multiple Winter Weather Advisories take effect across higher elevations. Forecasters warn that heavy snowfall, gusty winds, and rapidly changing road conditions could make mountain travel hazardous through early Saturday.
Winter Weather Advisory Begins Early Friday
According to the National Weather Service in Portland, snow is expected to begin around 4 a.m. Friday and continue into Saturday morning. The storm system will primarily affect elevations above 3,000 feet, with significant accumulation likely across much of the Oregon Cascades.
Snow totals of 6 to 12 inches are forecast for the North Oregon Cascades and the Cascades of Marion and Linn Counties, while areas of the South Washington Cascades could see even heavier snowfall. In some locations above 2,500 feet, accumulations may reach 14 to 16 inches, creating near-whiteout conditions at times.
Areas and Passes Most Impacted
The advisory covers several heavily traveled mountain corridors and recreation areas, including:
- Santiam Pass and Santiam Junction
- McKenzie Pass
- Government Camp
- Larch Mountain
- Breitenbush Springs
- Mount St. Helens area
- Timothy Lake and Lost Lake
These routes are commonly used by commuters, freight traffic, and weekend travelers, increasing the likelihood of congestion and delays during peak snowfall periods.
Lane County Cascades Also Under Advisory
A separate Winter Weather Advisory is in effect for the Cascades of Lane County, including Willamette Pass and Waldo Lake. In this area, forecasters expect 6 to 11 inches of snow, mainly above 4,500 feet, from early Friday through early Saturday.
While snowfall totals in Lane County may be slightly lower than farther north, officials warn that slick roads and reduced visibility will still pose serious challenges for drivers, especially overnight and during heavier snow bursts.
Strong Winds and Blowing Snow a Concern
In addition to heavy snow, wind gusts up to 40 mph are expected in some mountain zones. These winds could create blowing and drifting snow, significantly reducing visibility and making it difficult for drivers to judge road conditions.
Officials caution that conditions near mountain passes can deteriorate rapidly, even if roads appear manageable at lower elevations. Sudden whiteout conditions and icy pavement may develop with little warning.
Travel and Safety Warnings Issued
Transportation and emergency officials warn that roads, bridges, and overpasses are likely to become slick and hazardous. The highest risk periods are expected overnight and during early morning hours, when temperatures remain cold enough for snow to accumulate quickly.
Drivers are strongly advised to:
- Carry tire chains and know how to install them
- Bring winter emergency kits, including food, water, blankets, and flashlights
- Reduce speed and increase following distance
- Check road conditions before departing
Pedestrians and outdoor enthusiasts should also exercise caution, as walking surfaces may become icy and unstable near trailheads, parking areas, and lodge entrances.
What to Expect Through Saturday
Snowfall is expected to taper off gradually by early Saturday morning, but lingering slick spots may remain on untreated roads well into the day. Crews will continue plowing and treating mountain highways as conditions allow, though delays are possible during peak snowfall.
Travelers with flexible plans are encouraged to postpone non-essential mountain travel until conditions improve.
Staying Informed
Officials recommend monitoring weather updates and road conditions through official channels, including state transportation agencies and local forecasts, before heading into the Cascades.
As winter conditions intensify across the region, preparation and patience will be key to staying safe.
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