Seattle, WA – The National Weather Service warns that a powerful Pacific storm system, fueled by an atmospheric river, will bring periods of heavy rain, gusty winds, and mountain snow across the Pacific Northwest through Monday, October 27, 2025.
Rainfall totals are expected to reach 2 to 3 inches along the Oregon and Washington coasts, including areas near Eugene, Seattle, and Eureka, with localized higher amounts possible in coastal ranges. Inland areas such as Boise and Spokane may see up to an inch of rain by the end of the weekend.
According to NWS forecasters, several inches of heavy mountain snow are forecast for the Olympics, Cascades, and northern Rockies, particularly above 4,000 feet. Some higher elevations could receive 8 to 12 inches of snow, leading to hazardous travel conditions over mountain passes including Snoqualmie and Stevens Pass.
Forecasters note that isolated flooding may occur along the coast and in foothill regions due to persistent rain. Strong winds are also possible along exposed coastal areas and ridgelines, adding to the risk of downed trees and power outages.
The system is expected to spread eastward into the Great Basin and northern Rockies by late Saturday, gradually tapering off Monday morning.
Residents and travelers are urged to monitor local forecasts, check road conditions before traveling, and visit weather.gov for real-time updates and safety alerts.
