At least 30,000 households have been ordered to evacuate in Canada’s British Columbia province, where nearly 400 wildfires are raging.

Officials have restricted travel to Kelowna, a waterside city of 132,000 people, where smoke from nearby fires hangs over Lake Okanagan.

The order is designed to ensure enough accommodation for evacuees and emergency workers.

Fires have destroyed homes in nearby West Kelowna, a city of 36,000 people.

The travel restrictions also apply to the towns of Kamloops, Oliver, Penticton and Vernon and Osoyoos.

Hundreds of miles north, a huge fire continues to edge towards the city of Yellowknife.

An official deadline to evacuate the city – the capital of Canada’s Northwest Territories – lapsed on Friday. A local official said later that day that nearly all residents had left, either by car or plane.

About 19,000 of the city’s 20,000 inhabitants had evacuated. Authorities said 39 patients were moved out of a hospital to alternative facilities on Friday evening, making them the last people to be evacuated from the city.

Environment and communities minister Shane Thompson said some people had chosen “to shelter in place”, but urged locals to leave.

In British Columbia, evacuation orders grew from covering 15,000 homes on Friday to at least 30,000 by Saturday evening. Another 36,000 homes are under evacuation alert.

Emergency Management Minister Bowinn Ma said officials “cannot stress strongly enough how critical it is to follow evacuation orders”.

“They are a matter of life and death not only for the people in those properties, but also for the first responders who will often go back to try to implore people to leave,” she said.

Premier of the province, David Eby, put the total number of people ordered to leave at 35,000, with 30,000 told to be prepared to evacuate.

Canada is having its worst wildfire season on record, with at least 1,000 fires burning across the country, according to the Canadian Interagency Forest Fire Centre (CIFFC).

Experts say climate change increases the risk of the hot, dry weather that is likely to fuel wildfires.

Extreme and long-lasting heat draws more and more moisture out of the ground – which can provide fuel for fires that can spread at an incredible speed, particularly if winds are strong.

No deaths have been reported so far.

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