A blast of arctic air swept south from Canada into the northern United States, as flood-damaged communities in the Pacific Northwest braced for possible mudslides and levee failures.

Heavy rain​ has triggered flooding, rescues and road closures in Washington state, with Gov. Bob Ferguson declaring a statewide emergency​.

As the Pacific Northwest grapples with the aftermath of severe flooding, thousands of residents have been forced to evacuate their homes.

The Pacific Northwest is expected to see up to seven inches of rain this week, as the eastern United States braces for arctic cold.

Heavy rains drenching the Pacific Northwest triggered flooding on Thursday across much of the Pacific Northwest from Oregon north through Washington state and into British Columbia, closing dozens of roads and prompting widespread evacuations.

Pacific Northwest residents are bracing for another round of heavy rain after a powerful storm clobbered the region the day before.

11 A.M. DEC. 12: The day after heavy rains caused flooding that washed out bridges and roads in northwest Montana’s Libby, the roughly 2,700-person town is expecting light rain on Saturday before another big push of Pacific moisture on Monday and Tuesday next week, according to the National Weather Service.