Winter Storm Warning: Snow hits North Sound as Cascades face blizzard conditions
winter storm warning messaging is escalating as snow blanketed parts of Washington’s North Sound early Tuesday morning, while a mountain blizzard warning is set to kick in Wednesday night. Cities including Arlington, Everett, Granite Falls, Lake Stevens, Oso, and Marysville woke up to accumulating snow, and several school districts shifted schedules. The developing pattern also brings rising winds and increasing mountain snowfall, raising the risk of difficult-to-impossible travel in the Cascades during the most intense overnight window.
What we know right now (ET timeline)
Early Tuesday morning (ET), snow was already on the ground across parts of the North Sound, affecting morning routines in communities from Arlington to Marysville. Five public school districts announced two-hour late starts, and another district moved to snow routes, reflecting the immediate impacts in the lowlands.
In the mountains, the most severe alert window arrives Wednesday night into Thursday morning (ET): a blizzard warning is scheduled from 6: 00 p. m. Wednesday to 5: 00 a. m. Thursday for the Cascades spanning Snohomish, King (northern and southern), Lewis, Pierce, Skagit, and Whatcom counties. Locations specifically included in the warned area include Greenwater, Crystal Mountain, White Pass, Ashford, Mount Rainier, Snoqualmie Pass, Paradise, SR 18 at Tiger Mountain Summit, and Longmire.
Blizzard impacts in the Cascades: snow totals, wind, and travel risk
Forecast expectations call for wind gusts as high as 45 mph in the blizzard-warning area. Mountain snow is expected to intensify over the Cascade and Olympic mountains, with 4–5 foot+ snowfall totals possible at ski resorts. Officials also warned that snowy roads may make travel conditions difficult to impossible at times on mountain passes, with temporary road closures possible.
Gusty winds may sharply limit visibility at times and may also bring down tree branches. The same system is expected to become gustiest Wednesday evening and overnight (ET) as a compact low-pressure area forms and sweeps in, pushing south-to-west winds above 50 mph with a risk for a few power outages.
Along the Cascades in Washington and northern Oregon, winter weather advisories are in effect through Wednesday afternoon (ET). The National Weather Service warned that up to 10 inches of snow could fall at elevations above 3, 000 feet by 5: 00 p. m. Wednesday (ET), and that snow combined with wind gusts up to 35 mph could make travel difficult through the Cascade passes.
Winter Storm Warning and active watches/advisories in play
winter storm warning searches are spiking alongside a stack of winter alerts that tighten the timeline for travel decisions. A winter weather advisory remains in place until 6: 00 p. m. Wednesday (ET), and a winter storm watch is posted from late Wednesday night through late Friday night (ET) in the same broader pattern described for the region.
In the south Washington Cascades, a winter storm watch takes effect after the advisory ends, running from Tuesday afternoon through Wednesday afternoon (ET), as another system could bring additional snowfall and continued wind impacts.
Lowland rain, atmospheric river setup, and why this matters now
In the lowlands, showers are expected to pick up closer to lunchtime Tuesday (ET) from Long Beach through Westport and Port Angeles into the San Juan Islands, with rain moving through SeaTac and Renton mid-afternoon (ET). Scattered showers are expected for the evening commute (ET), while mountain snow increases into a fuller surge by Tuesday evening (ET).
The passing storm is embedded within an atmospheric river that is not expected to be as strong or as long-lasting as a December event referenced in the forecast discussion. Still, it has the potential to drop 1–2 inches of rainfall around Seattle and Redmond, with more than double that from Olympia through Chehalis through the weekend (ET).
What’s next
The immediate focus is the Wednesday night-to-Thursday morning (ET) blizzard-warning window in the Cascades, when wind-driven snow and low visibility could force rapid changes in pass conditions and possible temporary closures. Drivers heading into higher elevations should prepare for quickly deteriorating travel, while lowland communities track the shift from early snow to rain and scattered showers. As the week progresses, watch for the next updates tied to the winter storm watch period extending into late Friday night (ET), with winter storm warning concerns centered on whether the most hazardous impacts remain confined to the passes and resort corridors or expand with shifting wind and precipitation bands.
