Thousands of people fleeing a wildfire on the outskirts of Yellowknife, one of the largest cities in Canada's north, have crowded into the local airport and the road out of town.

Afghan Voice Agency (AVA) - Monitoring: A state of emergency was declared early on Friday in Kelowna, a city some 300km east of Vancouver with a population of about 150,000. The Pacific province says the next 24 to 48 hours could be the most difficult.

Some of the hills around the city blazed in the predawn light after wildfires that had been burning since Tuesday jumped Lake Okanagan and spread into parts of Kelowna.

“Residents under Evacuation Alert are advised to be ready to leave their home at a moment’s notice,” the city said in a statement, adding that people should prepare to be away from their home for an extended period.

Some 1,425km to the northeast, the massive blaze threatening Yellowknife, the Northwest Territories’ capital city, made little progress on Thursday, but changing winds meant it could reach the outskirts by the weekend, said Mike Westwick, the territories’ fire information officer.

“The next two days are absolutely critical and will be some of the most challenging of the season,” he told the Canadian Broadcasting Corp early on Friday.

“We’re going to be putting everything we have into slowing that progression down. We’re going to be throwing aircraft at it and when it’s safe, we’re going to be throwing people at it,” Westwick said.

The fire is about 15km northwest of the city, but changing winds are expected to drive it closer. Fires have been burning on either side of the only highway out of town, but it remained open.

“Leaving Yellowknife, you’re driving into the smoke,” said Brent Saulnier, who had been visiting the city from neighbouring Alberta. “It is on fire on both sides of the road. ... It’s a very surreal experience.” Many still must leave the city of around 20,000 with the deadline for evacuation set at noon local time (1800 GMT). Some 10 evacuation planes ferried about 1,500 people out of Yellowknife on Thursday, and about 22 flights were due out on Friday, authorities said.

“Nobody envisioned an event of this scale. It’s still really stressful. There are a lot of people still left in Yellowknife that are freaking out,” said resident Tebbia Teoncey, who was evacuated to Edmonton, Alberta.

Around 65 per cent of the 46,000 total population of Northwest Territories looked set to be evacuated.

Teams including members of the military were cutting down vegetation to create fire breaks, setting up sprinkler systems, and setting deliberate fires to eliminate fuel before the bigger blaze approaches, Westwick said.

The expanse of fire risk and disruption to life and land underscores the severity of this year’s worst-on-record Canadian wildfire season, with more than 1,000 active fires burning across the country.

Experts say climate change has exacerbated the wildfire problem. Drought and high temperatures have been a contributing factor to the number and intensity of this year’s fires, officials say. Much of Canada has seen abnormally dry conditions./Dawn news