The fires burning in northern Saskatchewan could burn until the first snowfall, according to researchers.

Kerry Anderson, a research scientist with the Canadian Forest Service, said the weather pattern known as El Nino, which is caused by the warming of the Pacific Ocean off the coast of South America, is responsible.

He expects weather conditions will settle down in Saskatchewan in the coming weeks, but warmer than normal temperatures will likely persist in B.C. and Alberta.

Anderson said even if crews bring the Saskatchewan fires under control, they may not actually be out until the fall.

"The large fires that are burning there will continue to burn until they are contained or until a fire-ending event may occur, and that may just end up being the first snowfall."

Fire rages near Mark Paquette's cabin on Nemeiben Lake. Late on July 8, 2015, Paquette said his cabin had been spared. (Submitted by Mark Paquette) Wildfire expert Mike Flannigan said tinderbox conditions that have lead to the destructive fires in the West can be blamed on climate change.

"Our weather this year has been very hot, dry and windy," said the University of Alberta professor.

"This is consistent with what we expect with climate change. I'm not saying every year is going to be a bad fire year, but we are going to see a lot more fire on the landscape."

Help arrives from across Canada, the world

Soldiers began helping crews fight wildfires threatening communities in northern Saskatchewan on Wednesday, as other western provinces called in help from foreign countries.

About 360 troops were building fire guards and clearing brush near La Ronge and Montreal Lake.

Steve Roberts with Saskatchewan Wildfire Management said crews made some progress and better visibility allowed aircraft to dump water on some flames.

He said the fire situation across Western Canada is so busy that it is a challenge for the provinces to get enough firefighters.

A fire crew battles a blaze in the La Ronge area on northern Saskatchewa, Saturday, July 4, 2015. Thousands more people in northern Saskatchewan are being told that wildfires are too close for them to stay in their homes.But this time they'll be heading to Alberta instead of an evacuation centre in their own province. (Government of Saskatchewan/CP) "As we started down the road with these fires, Alberta and British Columbia fire hazards escalated, the numbers of fires increased and they had community evacuations as well," Roberts said.

"That has stretched the availability of resources across the country."

Flames and thick smoke have forced an estimated 13,000 people from their homes in Saskatchewan. Crews from Quebec, Ontario, Newfoundland, New Brunswick and South Dakota have been helping out.

Roberts said the province was in discussions with the United States government about more crews coming north.

The La Ronge First Nation was also seeking volunteers to help fight fires, including evacuees.

- Premier Christy Clark

The Canadian Interagency Forest Fire Centre, which co-ordinates firefighting services, said Canada may have to seek more help from abroad.

The latest report on the agency website said major wildfires "have the potential to exhaust agency fire resources nationally."

"National resource levels are insufficient to meet occurring and anticipated wildland fire activity," it said.

On Wednesday, Alberta said it was bringing in 62 firefighters from Mexico to help battle 92 wildfires. It was also looking at the possibility of crews from Australia and New Zealand.

British Columbia, with more than 180 fires, was to bring in firefighters from Australia. Forty properties were on evacuation order and about 500 were on evacuation alert.

B.C. Premier Christy Clark toured an area west of Pemberton on Wednesday with firefighters, and compared their job to playing chess.

A water bomber drops fire retardant on a forest in the LaRonge, Sask., area in this July 1, 2015 handout photo from the Saskatchewan Ministry of Environment. THE CANADIAN PRESS/HO - Saskatchewan Ministry of Environment - Wildfire Branch (Wildfire Branch/Saskatchewan Ministry of Environment/Canadian Press) "The difference is when you're playing a chess game with a forest fire, your opponent cheats. They don't play by the rules."

Another 240 soldiers from Edmonton were also in Saskatchewan helping with logistics. The military has said 500 more from Shilo, Man., were on standby.

Gov. Gen. David Johnston spent time with forest fire evacuees in Regina on Wednesday afternoon, and commended the "great professionalism" of all those fighting the fires and helping the evacuees.