Drier weather is coming, but flooding effects are likely to continue for days across portions of western Washington state and northwestern Oregon.

While the torrential downpour caused by an atmospheric river has slowed down, rivers and waterways continue to rise and flood in the state.

Washington is under a state of emergency and evacuation orders are in place for tens of thousands of residents. Gov. Bob Ferguson on Thursday urged everyone to follow evacuation instructions as yet another river neared record levels.

"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.

Swollen rivers led to floods in numerous counties and evacuation notices for several cities, though some have been rescinded. Most of the rivers’ levels crested between Wednesday night and early Friday morning and while some didn’t beat previous records, most were close.

Washington state is under a state of emergency from a barrage of torrential rain that's sent rivers flowing over their banks, caused mudslides to close highways and trapped people in floodwaters.

Authorities are going door-to-door in South Prairie, Washington, in Pierce County, urging residents to leave their homes immediately as water rises there. The Pierce County Sheriff’s Office previously said that at least 25 people have been rescued in the county since Wednesday, including in South Prairie.

An atmospheric river event has been slamming the Pacific Northwest with rain, and the flood threat is far from over.