Heat waves are seen Friday as cars and trucks drive away from a massive wildfire south of the city of Fort McMurray in the Canadian province of Alberta. The size of the blaze has grown to 386 square miles.

EDMONTON, Alberta — Canadian officials fear a massive wildfire could double in size by the end of Saturday as they continue to evacuate residents of fire-ravaged Fort McMurray from work camps north of Alberta’s oil sands city.

Thousands more displaced residents will get a sobering drive-by view of their burned out city as convoys continue Saturday.

Police and military will oversee another procession of hundreds of vehicles, and the mass airlift of evacuees will also resume. A day after 8,000 people were flown out, authorities said 5,500 more were expected to be evacuated by the end of Friday and another 4,000 on Saturday.

More than 80,000 people have left Fort McMurray in the heart of Canada’ oil sands, where the fire has torched 1,600 homes and other buildings. The mass evacuation forced as much as a quarter of Canada’s oil output offlineand is expected to impact a country already hurt by a dramatic fall in the price of oil.

The Alberta provincial government, which declared a state of emergency, said Friday the size of the blaze had grown to 249,571 acres or about 386 square miles. No deaths or injuries were reported.

Chad Morrison, Alberta’s manager of wildfire prevention, said there was a “high potential that the fire could double in size” by the end of Saturday. He expected the fire to expand into a more remote forested area northeast and away from Fort McMurray. Extremely dry conditions and a hot temperature of 27 Celsius (81 Fahrenheit) was expected Saturday along with strong winds, he said.

Morrison said no amount of resources would put this fire out, and what was needed was rain.

“We have not seen rain in this area for the last two months of significance,” Morrison said. “This fire will continue to burn for a very long time until we see some significant rain.”