02/28/2014 04:52 EST | Updated 04/30/2014 05:59 EDT

Cold Calgary weather ahead as temperatures projected to drop below -30

Southern Albertans are bracing for a stretch of cold weather over the next few days as a blast of arctic air invades all three prairie provinces.

Wind chill warnings are in place for parts of northern and central Alberta, including Coronation, Hanna and Lloydminster. These areas could see wind chill values dip below  -40 degrees, says CBC Calgary's weather specialist Craig Larkins

“Extremely cold conditions will stick around for the weekend. Overnight lows in southern Alberta will sit between -30 degrees to -40 degrees tonight — those are actual temperature's, not wind chill values," said Larkins. 

"Forecast highs for both Saturday and Sunday will sit well below the average high of 1 degree. Calgary will only warm up to -27 degrees tomorrow, and will hover in the low minus 20s on Sunday."

 Larkins says these below seasonal temperatures will stick around until the beginning of next week. 

"A slight warm-up is expected by Wednesday," he said.

Airdrie firefighters camp out

A trio of firefighters is counting down to the end of the coldest camping trip any of them have ever done.

They set up camp on the roof of a Boston Pizza in Airdrie, Alta. to raise money for Muscular Dystrophy Canada. While the fundraiser isn't new to Alberta, firefighter Don Poulin says this is the first time Airdrie firefighters have taken part.

"We're crackin' jokes and we're playing some games and just keeping warm. Our focus there, is just keep us motivated to stay up here," said Poulin.

So far, the trio has raised thousands of dollars. They say the challenging part hasn't been raising funds, but staying warm. 

"You can tell by the weather forecast it's been cold — chilly. So, we're doing what we can out here with the heaters, the tents, the sleeping bags and everything," said firefighter Kyle McLaughlin. 

"Actually, contrary to popular belief, our fire gear is actually meant for heat which doesn't keep us very warm," adds Poulin. "So, actually underneath our jacket here we just have about four layers here — and we just don't take 'em off."

The firefighters have been camping out since Thursday and will be up on the roof until Saturday.