Other people likely wil be airlifted out of the fire zone, as 7,000 were Thursday, according to authorities.
Some 15,000 people remain stranded north of the devastated city, but not all will leave, Alberta Premier Rachel Notley said.
Some remain behind
Some hardy souls working for the oil industry will remain behind to tend to facilities there, authorities said. The region is known for its massive oil reserves -- the third-largest in the world.
But officers are going into accessible areas and looking for signs of others, Sgt. Jack Poitras, a spokesman for the Royal Canadian Mounted Police, told reporters Thursday.
"We still have some people who have been hanging around," he said.
Overnight, the fire's footprint grew, racing up to the doorstep of the community of Anzac before firefighters beat it back.
Winds were expected to shift and push the fire away from developed areas.
Morrison warned of "extreme fire behavior" in the following days as the blaze pushes into heavily forested areas.
The fire will likely burn for "weeks and weeks," he said.
"There's no tankers we can put at this thing to stop it," he said, noting the fire was so large and aggressive it's jumped a 1-kilometer wide river and created its own lightning.
The cause remains unclear, Morrison said.
But the region is in the midst of a drought, he said. Two months without appreciable rain has left vegetation dangerously dry.
Forecasters think Saturday will be dry and windy again, but there is a 40% chance of showers on Sunday and Monday.