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.

Sixty million people from the northern Plains through the Southeast are under cold weather alerts this weekend and will face dangerously cold wind chills.

"The only clothes I got is just my pajamas," 7-year-old Jocelyn Rosas told CBS News' Carter Evans, as flooding devastated parts of Washington state.

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

After thousands of residents in some Washington towns were evacuated, the federal government approved a request to seek emergency financial aid.

It was a surreal experience to see the entire Trail Run development of about 350 homes up so late, scrambling to leave following the evacuation order.

Gov. Bob Ferguson, who has warned that as many as 100,000 people would need to evacuate statewide, said Friday the Trump administration has approved a disaster declaration.

Washington state residents are bracing for possible mudslides and levee failures from floodwaters that are expected to be slow to recede.