Some of the 80,000 residents who had fled Fort McMurray to Anzac after a mandatory evacuation notice were told just after midnight that they would have to move again.
"Buses are being assembled," authorities said in a statement, adding they were "going door to door " and urging people to "remain calm."
Six reception centers were operating within the province, officials said at a news conference.
More than 250 firefighters, helicopters and air tankers were fighting the fires that have extended over more than 24,000 acres. Alberta Premier Rachel Notley announced that a "Memorandum of Understanding" has been signed with the Canadian Armed Forces for air support to assist with transportation as needed.
Residents were advised by the Rural Municipality of the changing weather patterns.
In the latest official estimates for Fort McMurray, the Beaconhill neighborhood has lost 70 percent of homes, Abasand 50 percent, Waterways lost 90 percent and around 30 houses were lost in Wood Buffalo. No injuries or fatalities have been reported.
Sad story. Let us be thankful as we celebrate Mother's Day. Just a thought.
Sad story. Let us be thankful as we celebrate Mother's Day. Just a thought.