Atmospheric River To Bring Significant Rain To Northwest Oregon This Weekend

Michael

3 min read

Post on Aug 15, 2025

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Atmospheric River to Bring Significant Rain to Northwest Oregon This Weekend

Get ready for a soaking! Northwest Oregon is bracing for a powerful atmospheric river set to unleash significant rainfall this weekend, prompting concerns about flooding and potential landslides. Forecasters are urging residents to prepare for the deluge, expected to begin Friday evening and continue through Sunday.

This isn't your average weekend rain shower. The National Weather Service (NWS) is predicting widespread rainfall totals ranging from 3 to 6 inches across much of the region, with isolated areas potentially receiving upwards of 8 inches. This substantial amount of precipitation in such a short timeframe raises serious concerns about the impact on already saturated ground.

What is an Atmospheric River?

An atmospheric river (AR) is a long, narrow, and transient corridor or filament of concentrated moisture in the atmosphere. Think of it as a river in the sky, carrying vast amounts of water vapor from tropical and subtropical regions. When these rivers make landfall, they can release torrential amounts of rain, leading to significant flooding and other weather-related hazards. Understanding atmospheric rivers is crucial for effective weather forecasting and disaster preparedness.

Potential Impacts and Preparations:

The NWS has issued several warnings and advisories, including:

• Flood Warnings: Low-lying areas and those near rivers and streams are at high risk of flooding. Residents in these areas should be prepared to evacuate if necessary.
• Landslide Warnings: The saturated ground conditions increase the risk of landslides, particularly in hilly and mountainous regions. Avoid travel in these areas if possible.
• High Wind Advisories: Strong winds are also expected, potentially leading to downed power lines and tree damage.

Here's how you can prepare:

• Monitor weather forecasts: Stay updated on the latest forecasts from the NWS and local news outlets.
• Clear drains and gutters: Ensure water can flow freely to prevent flooding around your home.
• Secure outdoor objects: Bring loose items inside or secure them to prevent damage from high winds.
• Charge electronic devices: In case of a power outage.
• Have an emergency plan: Know your evacuation route and have a supply of essential items, including food, water, and medications.

Impacts on Transportation and Infrastructure:

The heavy rainfall is expected to significantly impact transportation. Drivers should anticipate road closures, delays, and hazardous driving conditions. Public transportation may also experience disruptions. Authorities are urging residents to avoid unnecessary travel during the storm. The potential for power outages also presents a significant challenge to infrastructure.

Beyond the Weekend:

While the heaviest rainfall is expected to subside by Sunday evening, lingering showers and damp conditions are likely to persist into early next week. The long-term impacts of this atmospheric river event, including potential damage assessments and recovery efforts, will unfold in the days following the storm.

Stay informed and stay safe! This atmospheric river event promises to be a significant weather event for Northwest Oregon. By taking proactive steps and staying informed, residents can mitigate the risks and ensure their safety during this period of intense rainfall. Remember to check local news for the latest updates and advisories.