The National Weather Service in Portland has issued a Flood Potential alert for Northwest Oregon and Southwest Washington, effective from Monday, December 8 through Thursday, December 11, 2025, due to a powerful atmospheric river expected to bring prolonged heavy rainfall across the region.

What’s Causing the Threat

Forecasters report that a strong atmospheric river system will bring widespread, heavy rain from Monday through Wednesday, with flooding potentially lingering into Thursday even after the heaviest rain subsides. These prolonged rain events significantly increase the risk of rivers, creeks, and low-lying areas overflowing.

Areas at Risk

The alert covers all locations across Northwest Oregon and Southwest Washington, including coastal communities, river valleys, urban corridors, and foothill regions.

Expected Impacts

Residents should prepare for:

Flooding along rivers and creeks draining from the Coast Range, Willapa Hills, and the Cascades

Urban flooding in areas with poor drainage

Landslides and slope failures in steep terrain

Debris flows, especially near recent wildfire burn scars

Travel disruptions, road closures, property damage, and power outages are all possible during this multi-day weather event.

Safety and Preparedness Guidance

Officials urge residents to take proactive steps now:

If you live in a flood-prone area, review your emergency plan and protect property where possible.

Never drive through flooded roadways—even shallow water can sweep vehicles away.

Monitor official forecasts, river gauges, and local emergency alerts closely.

Prepare emergency kits, backup power, and alternative travel routes.

For more flood safety information, visit:
Http://www.weather.gov/safety/flood

---