Atmospheric River Threatens Power Outages in California, Oregon and Washington

An approaching atmospheric river could bring disruptive weather to California, Oregon and Washington, with strong coastal winds raising the possibility of power outages as parts of the West Coast face heavy rain and mountain snow.

Heavy Rain and Coastal Winds Possible

The National Oceanic and Atmospheric Administration’s Climate Prediction Center, in guidance updated November 6, identified November 14–15 as a period of concern.

Parts of southwestern Oregon and northern and central California face a moderate risk of heavy precipitation, meaning a 40–60% probability. The immediate West Coast also faces a moderate risk of high winds during that period.

Mountain Snow Could Complicate Travel

Higher elevations of the Klamath Mountains and Sierra Nevada face a moderate risk of heavy snow on November 14–15. A broader, lower-probability snow threat extends into November 17 across additional western mountain ranges, including the Cascades.

The combination could create difficult conditions for people traveling through mountain passes, even where lower elevations receive rain.

Power Outages Possible, but Forecast Remains Uncertain

NOAA advises residents to prepare for possible wind-related power interruptions, monitor local forecasts and avoid flooded roads.

Forecasters stress that the storm’s precise timing and intensity remain uncertain. The outlook signals an increased chance of hazardous weather; it does not establish that widespread outages will occur across all three states. Local forecasts will provide more specific guidance as the system approaches.