Seattle, WA – Drivers planning travel through the mountains east and south of Seattle are being urged to prepare for dangerous winter conditions as a Winter Weather Advisory takes effect this week across parts of Washington’s Cascades and Olympic Mountains.
The National Weather Service in Seattle issued the advisory Monday afternoon, warning that significant snowfall and strong winds could make travel hazardous from late Tuesday through Wednesday night.
Winter Weather Advisory Details
The advisory is scheduled to remain in effect from 4 p.m. Tuesday through 10 p.m. PST Wednesday. Forecasters expect 6 to 10 inches of snow at higher elevations, with the heaviest accumulations focused around major mountain passes and recreation areas.
Impacted locations include Snoqualmie Pass, White Pass, Crystal Mountain, Mount Rainier’s Paradise and Longmire areas, Hurricane Ridge, and stretches of State Route 18 near Tiger Mountain Summit. These corridors are heavily traveled by commuters, freight traffic, and winter recreation visitors.
Snowfall Timeline and Weather Conditions
Meteorologists say snowfall will begin increasing Tuesday afternoon before intensifying Tuesday evening and continuing through much of Wednesday. Snow may fall steadily at pass level, with periods of heavier accumulation during overnight and early morning hours.
Winds in the mountain passes are expected to gust up to 35 mph, particularly along exposed ridgelines and higher elevations. These gusts could lead to blowing and drifting snow, sharply reducing visibility at times, especially over White Pass and open sections of Snoqualmie Pass.
Travel Impacts and Road Safety Concerns
The advisory covers the Cascades of Southern King County, Pierce County, Lewis County, and the Olympic Mountains—regions that frequently see winter travel disruptions during snow events of this magnitude.
Transportation officials warn that travel could become very difficult during heavier snowfall periods. Snow-covered roads, slick surfaces, and sudden whiteout conditions may develop quickly, particularly overnight when temperatures drop and snow compacts on roadways.
Drivers traveling through mountain passes should expect slower speeds, possible chain requirements, and the potential for temporary closures if conditions worsen.
Power Outage and Infrastructure Risks
In addition to travel hazards, forecasters note that the combination of gusty winds and accumulating snow could bring down tree branches in mountain communities. This raises the risk of scattered power outages, particularly in forested areas and higher-elevation recreation zones.
Visitors staying overnight in mountain lodges or cabins are advised to ensure they have emergency supplies, backup lighting, and fully charged mobile devices.
Advisory Upgrade and Official Guidance
The Winter Weather Advisory was issued at 1:55 p.m. Monday, replacing an earlier winter storm watch as forecasters gained confidence in snowfall totals and impacts.
Transportation and emergency officials are urging motorists to slow down, carry tire chains or approved traction devices, and allow extra travel time. Drivers unfamiliar with winter mountain driving are encouraged to postpone non-essential travel until conditions improve.
Those heading to ski resorts or crossing the passes should regularly check updated forecasts and real-time road conditions from state transportation agencies before departing.
What Drivers Should Do Now
Officials recommend preparing for rapidly changing weather by checking vehicle readiness, keeping fuel tanks full, and packing emergency kits that include blankets, food, water, and extra clothing. Travelers should also share travel plans with someone before heading into the mountains.
Conditions may evolve as the storm develops, and additional advisories or warnings could be issued if snowfall totals increase.
Drivers are encouraged to stay alert, monitor official updates, and prioritize safety when traveling through Washington’s mountain regions this week. Share your experiences in the comments below.
