A controlled burn has gone out of control in Riding Mountain National Park. Some people living around the park have been told to be ready to leave with a moment's notice.

"There are just some factors we cannot account for and so there's always a risk," explained Cate Watrous of Riding Mountain National Park.

Two helicopters and more than 40 firefighters are now working in the southern part of the park. They're trying to prevent the fire that is burning over 1,000 hectares of land, from spreading even more out of control.

"It was bigger than we intended but, fortunately, we have the crews and capabilities to work to get this under control," said Watrous.

Some roads and trails within the park are closed. Officials are also worried the fire may spread outside the park's boundaries. 14 nearby home have been put on evacuation alert in the RM of Clanwilliam.

"It is close," said Kat Bridgeman of the RM of Clanwilliam. "But it's not affecting us at the moment."

Park officials say when the controlled burn was lit on Sept 23, conditions were good. That controlled fire was put out but reignited on Wednesday. Officials say weather was a factor.

"With all the hot temperatures and the high winds we've had the last few days, that was not helping us," explained Watrous. "But, overnight, with the cooler temperatures and higher humidity that really is working in our favour."

-With a report from CTV's Josh Crabb