Residents in the Pacific Northwest of the US and Canada are bracing for what could be record setting floods as an atmospheric river dumps heavy rain on already swollen rivers. The US National Weather Service warns that catastrophic flooding is possible in the states of Oregon and Washington along the Skagit and Snohomish rivers.

Up to 100,000 people in Washington state could be ordered to evacuate amid the threat of "catastrophic" flooding, officials said. Washington Gov. Bob Ferguson, who has declared a state of emergency, stressed Thursday that the flooding "is extremely unpredictable" and "potentially historic.

Up to a foot of rain has already fallen in the last few days, and more is on the way amid major flooding in Washington state.

An atmospheric river, whose moisture spanned a remarkable 7,000 miles across the Pacific from the Philippines to the Pacific Northwest, caused record river levels and destructive flooding across Washington state this week.

Days of heavy rain due to an atmospheric river that hit Washington state is culminating in the threat of record-breaking deadly flooding in some areas. "This situation is extremely serious," said Washington's Democratic Governor Bob Ferguson on Wednesday. "The next few days are critical."

About 100,000 people have been asked to evacuate their homes in Washington as a series of atmospheric river storms drenched the state this week.

Unprecedented flooding is driving tens of thousands of people from their homes. Local authorities are sharing resources, and the state is asking for federal aid.

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.

The FOX 13 Seattle team is on the ground across Western Washington, covering the latest updates on historic flooding caused by an atmospheric river that drenched our region this week. Our team has the very latest on evacuation orders,