Western parts of the Pacific Northwest are facing flooding after an atmospheric river moved over the region.

On Tuesday, Dec. 9, Washington and Oregon saw heavy rain that impacted local waterways, according to the National Weather Service in Seattle. Areas in Washington experienced at least half an inch of rain per hour.

Paradise, Washington, located on the south slope of Mount Rainier National Park, around 103 miles southeast of Seattle, received 3.25 inches of rain in the last 10 hours.

The flooding was caused by an atmospheric river. These systems, which are often called a " Pineapple Express ," are a "long, narrow region in the atmosphere – like rivers in the sky – that transports most of the water vapor outside of the tropics," according to the National Oceanic and Atmospheric

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