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A powerful atmospheric river is set to bring heavy rain, strong winds, and mountain snow to the Pacific Northwest.

The storm system also poses a risk of flash flooding and mudslides for parts of California.

Some areas of Washington and Oregon could receive a month's worth of rain in just a few days.

An atmospheric river is a long, narrow corridor of air that transports significant water vapor from the tropics.

A powerful atmospheric river will hit the Pacific Northwest starting Thursday, bringing heavy rain, gusty winds and mountain snow.

The system may also impact parts of California, raising the risk of flash flooding and mudslides all along the West Coast.

The system is expected to bring periods of heavy rain and gusty winds across western Washington, includ

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