Record river flooding is ongoing in parts of Washington State, but following a drier weekend, a new worry for wetter weather will arise early this week.

"The flooding levels we're looking at are potentially historic in nature," Gov. Bob Ferguson said Thursday afternoon, urging people to listen to official advice and follow evacuation orders.

Another round of rain and wind is in store for the Pacific Northwest as early as late Sunday, forecasters said.

Flood alerts are in effect across the Pacific Northwest as a second wave of heavy rain from an atmospheric river pushes into the region. Western Washington is already experiencing major river flooding,

Meanwhile, residents of the Pacific Northwest braced for possible mudslides and levee failures as floodwaters slowly recede.

On Tuesday, Dec. 9, Washington and Oregon saw heavy rain that impacted local waterways, according to the National Weather Service in Seattle.

An arctic air blast swept south from Canada, spreading into the northern United States. Meanwhile residents of the Pacific Northwest braced for possible mudslides and levee failures as floodwaters slowly recede.

Multiple atmospheric rivers have brought more than a foot of rain to Washington and Oregon this week, causing historic flooding.