Wildfire approaches Canada’s largest oil-producing area. Again.

OTTAWA, Ontario — A wildfire near Canada’s largest oil-producing region prompted the evacuation of about 6,600 people Tuesday from Fort McMurray, Alberta. Several thousand other residents of the city were told to be prepared to leave at any moment.

The evacuation has evoked fearful memories of a major fire in 2016 that destroyed roughly 2,400 homes and businesses, forced 90,000 people to flee and became the most expensive natural disaster in Canadian history.

“I know that this will bring back difficult memories from the devastating fires of 2016,” Danielle Smith, the premier of Alberta, said during a news conference Wednesday. “And I’m sure these memories will create fear and uncertainty.”

The start of wildfire season in Canada follows a record-setting year in 2023 when about 45 million acres of forest burned, a huge increase from the annual average of 6.1 million.

Unusually large fires spanned the country last year from Nova Scotia on the Atlantic coast to British Columbia on the Pacific. Choking smoke from fires in Quebec filled the skies of Eastern Canada, filtering down and degrading air quality down the Eastern Seaboard of the United States.

At the season’s peak in mid-July, there were 29 megafires, which the government defines as those extending over more than 100,000 hectares, or about 247,000 acres.

Last week federal officials said that prolonged dry conditions in Alberta and British Columbia have set up a potentially dangerous wildfire season in those areas as well as to the north.

This week’s evacuation order was one of several issued in recent days in northern Alberta and neighboring portions of British Columbia, an area hard hit last year by fires and that is in its third year of drought.

On Wednesday morning, the leading edge of the fire was about 3 miles from parts of Fort McMurray. Alberta Wildfire said diminishing winds and cooler temperatures were reducing the fire’s severity.

The fire had consumed about 52,000 acres as of Wednesday morning, Christie Tucker, a spokesperson for Alberta Wildfire, a provincial agency, told reporters. But she said the strong winds that were expanding the fire while pushing it toward Fort McMurray had weakened and reversed direction Wednesday. Falling temperatures were also helping firefighters.

Aircraft, including some with night vision systems, were still dropping water on the fire, and measures to protect buildings in Fort McMurray were put in place.

Much of the fire, however, is sweeping over terrain that was burned in 2016, reducing the amount of fuel available for the current fire, officials said.

Jody Butz, fire chief of the Regional Municipality of Wood Buffalo, said during a news conference Tuesday that he has “a high, high level of confidence” that firefighters will keep the fire out of Fort McMurray.

He said the city has cleared more areas outside its borders to keep fires at bay than in 2016, and also has larger numbers of firefighters and equipment available.

Two neighborhoods under the current evacuation orders were among the areas burned most extensively in 2016 and then rebuilt.

To avoid the highway chaos that marked evacuations in 2016, officials asked residents of neighborhoods not under evacuation orders to remain in their homes until areas that were in greater danger were cleared.

“Please, please allow these communities to evacuate first,” Butz told residents during a news conference Tuesday. “It is important that we approach this in a safe and orderly and respectful manner.”

Aleks Mortlock, whose home was destroyed in the 2016 fire, told the CBC, Canada’s public broadcaster, that his earlier experience did not make Tuesday’s evacuation any easier.

He said that he has “the same anxiety, same things going through your mind, and this time, I have kids to worry about.”

Mortlock said his two children who are under the age of 6 “don’t really understand” the perilous situation the fire had created.

People who had left the area sought shelter as far away as Edmonton, the provincial capital, which is about 280 miles south.

Another wildfire in the region near Fort Nelson, British Columbia, has led to the evacuation of about 4,700 people since the weekend. More favorable winds there have aided firefighters in their efforts to control the fire, which had come within about 1 mile of the community and close to the neighboring Fort Nelson First Nation.

Farther east of Fort Nelson, the entire population of Cranberry Portage, Manitoba, about 700 people, was evacuated because of wildfire. The community in Manitoba’s north has been menaced by fires in the past.

The 2016 fire in Fort McMurray, which came to be known as “The Beast,” led to about 4 billion Canadian dollars in insurance settlements and disrupted production at the oil sands, the United States’ largest source of imported oil.

The last-minute evacuation from that fire forced many residents to drive through walls of flame on the only highway south. While the fire did not directly cause any deaths among residents or fire crews, two people who were evacuating died in a highway collision.