Rare Atmospheric River Event Expected To Flood Parts Of Northwest Oregon

Michael

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Post on Aug 16, 2025

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Rare Atmospheric River Event Expected to Flood Parts of Northwest Oregon

Northwest Oregon braces for potentially devastating flooding as a rare and powerful atmospheric river targets the region. Forecasters are warning residents of imminent danger, urging preparedness and evacuation where necessary. This unprecedented weather event is expected to bring torrential rainfall and significant river rises, potentially surpassing levels seen in previous major floods.

The National Weather Service (NWS) has issued multiple warnings, including flash flood watches and warnings, for much of Northwest Oregon. The intensity and duration of this atmospheric river are causing significant concern, as the region is already saturated from recent rainfall. This potent weather system, sometimes referred to as a "Pineapple Express" due to its origin near Hawaii, is predicted to unleash several inches of rain in a short period.

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What is an Atmospheric River?

An atmospheric river is a long, narrow, and transient corridor or filament of concentrated moisture in the atmosphere. Think of it as a river in the sky. These rivers transport vast amounts of water vapor, and when they make landfall, they can unleash intense precipitation. While atmospheric rivers are a normal part of the weather pattern, the intensity and duration of this particular event are exceptionally rare and pose a significant threat. Learn more about atmospheric rivers from the .

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Areas Most at Risk:

Several counties in Northwest Oregon are facing the highest risk of flooding. These include, but are not limited to:

• Clatsop County: Coastal areas and low-lying regions are particularly vulnerable.
• Tillamook County: Riverine flooding is a major concern.
• Columbia County: Communities along the Columbia River are at risk of significant flooding.
• Washington County: Certain areas near the Willamette River could experience severe flooding.

Residents in these areas are strongly urged to monitor weather reports closely and follow instructions from local authorities. Evacuation orders may be issued with little notice.

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Preparing for the Storm:

The NWS recommends taking the following precautions:

• Monitor weather forecasts: Stay updated on the latest predictions from the NWS.
• Prepare an emergency kit: Include essential supplies like water, food, medications, and a first-aid kit.
• Develop an evacuation plan: Know your evacuation routes and have a designated meeting place for your family.
• Protect your property: Move valuable items to higher ground and secure outdoor objects.
• Sandbag: If possible, sandbag vulnerable areas of your property.

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Impact on Infrastructure:

The severe weather is also expected to impact transportation and infrastructure. Road closures and power outages are likely. Drivers should avoid unnecessary travel and be prepared for hazardous driving conditions. The potential for widespread damage to roads, bridges, and other infrastructure is a significant concern.

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Staying Informed:

For the most up-to-date information on weather alerts and emergency instructions, visit the and follow your local news channels. Your safety is paramount. Heed all warnings and instructions from emergency officials. This rare atmospheric river event demands immediate attention and preparedness from all residents in the affected areas. Stay safe, Oregon!