SEATTLE, Wash. — Western Washington is bracing for a week of heavy rain, flooding, and gusty winds, with meteorologists issuing multiple weather alert days from Monday through Thursday as a powerful atmospheric river moves into the region.
Flood Watches and Weather Alerts
According to FOX 13 Chief Meteorologist Brian MacMillan, the incoming storm pattern could bring major flooding to parts of western Washington by midweek. Rivers including the Snoqualmie near Carnation and the Snohomish near Monroe are forecast to reach “major” flood stage Wednesday and Thursday — potentially their highest levels since February 2020.
The Skagit River could also approach major flood levels, with officials warning that the event may rival or exceed the December 2023 floods.
“You may hear this described as a Category 5 atmospheric river,” MacMillan said. “That’s the highest on the AR scale, and it means a significant potential for major flooding.”
Day-by-Day Outlook
- Friday–Sunday: Intermittent showers continue, with heavier rain expected Sunday, particularly along the coast and mountains.
- Monday: The atmospheric river arrives, bringing 1–2 inches of rain to the Puget Sound area and stronger gusts along the coast.
- Tuesday: Slightly lighter rain — around ½ inch — though rivers will continue rising rapidly.
- Wednesday: The most concerning day, with another 1–2 inches of rain and rivers cresting at moderate to major flood stage.
- Thursday: Flooding will persist even as rainfall lightens; some rivers could crest a second time.
- Friday: Rain may continue but with less intensity. Officials expect this day to focus on cleanup and receding floodwaters.
Coastal Flooding and King Tides
A Coastal Flood Advisory is in effect for Whatcom, Skagit, Snohomish, and Grays Harbor counties, warning of minor flooding due to king tides and elevated sea levels. Low-lying areas, parks, and parking lots may experience water levels up to two feet above ground during high tide cycles.
Mountain Snow and Wind Hazards
A Winter Weather Advisory has been issued for Stevens Pass from Friday night through Saturday evening, with 6–11 inches of snow expected and gusts up to 35 mph.
Meanwhile, Island County is under a Wind Advisory for gusts up to 45 mph, and Eastern Washington faces a High Wind Warning with gusts potentially reaching 60 mph.
Elevated Landslide Risk
The repeated rounds of heavy rain will saturate soil and increase landslide risk across western Washington, particularly along slopes and areas recently impacted by construction or deforestation. Commuters are advised to watch for debris and pooling water on roadways.
Stay Prepared
Officials urge residents to monitor flood warnings, avoid driving through standing water, and prepare emergency kits in case flooding or power outages occur.
Meteorologists warn that conditions could change rapidly depending on how the atmospheric river evolves.
Stay with HonkNews.com for real-time updates, river forecasts, and safety alerts as Seattle and surrounding counties prepare for a stormy and flood-prone week ahead.