Maps Reveal Potential for 4-Inch Rainfall in Oregon’s Atmospheric River Path
Parts of northwest Oregon and western Washington are bracing for significant rainfall this week due to a strong atmospheric river. The weather system is anticipated to bring several inches of rain from Monday to Wednesday, prompting widespread flood watches across the region.
What is an Atmospheric River?
An atmospheric river consists of a concentrated band of water vapor in the atmosphere. This moisture can lead to heavy rainfall, especially after preceding wet weather. Unlike previous systems this fall, the current atmospheric river is expected to result in notable flooding conditions.
Rainfall Forecast for Oregon and Washington
The National Weather Service has issued maps indicating areas that could see four or more inches of rain by Thursday, December 11, 2025. Some regions may even experience higher totals.
Key Rainfall Predictions
- A 74% chance of over six inches of rain is expected in the coastal range near Tillamook.
- Additional forecasts highlight that the heaviest rainfall is likely to occur north of Lane County.
Flooding Risks
Authorities warn of widespread urban, river, and small stream flooding. The risk is particularly acute for individuals living below steep slopes, or near canyons, where rapid landslides or debris flows could occur. Residents in these prone areas should take necessary precautions to mitigate flooding impacts.
Stay Prepared for Severe Weather
The National Weather Service emphasizes that residents should remain vigilant and prepared for potential flooding. Taking proactive measures can help reduce risks associated with this intense storm system.
