Overview
- Flood watches and multiple river flood warnings cover western Oregon and Washington, with alerts running through late week as rains persist.
- A second, stronger atmospheric river is forecast to come ashore early Monday and continue for more than 72 hours, with the greatest flood risk Tuesday and Wednesday.
- CW3E and ensemble guidance indicate AR4 to AR5 intensity is possible in parts of Washington, raising the likelihood of widespread river flooding.
- Forecast rainfall totals are about 4–7 inches across lowlands, with over 10 inches possible on the Olympic Peninsula, coastal ranges and windward Cascade slopes.
- Warnings cite rises on the Wilson River, Johnson Creek and Grays River, with major stage forecasts on the Snoqualmie and Snohomish, plus elevated landslide risk, king‑tide coastal inundation and gusty winds that may down trees and power lines.