Strange looking cloud lingers over Saskatoon following thunderstorm

After a thunderstorm rolled through Saskatoon Wednesday morning, a bizarre sight followed behind it.

Backside of the cloud. You can see it ebbing and flowing really quickly. A neat sight. #yxe #skstorm pic.twitter.com/dyM5xqdTom

— Chris Vandenbreekel (@Vandecision) July 24, 2019

Global Saskatoon meteorologist, Peter Quinlan said this type of cloud is called a roll cloud, as it rolls on a horizontal axis around itself.

He said these clouds often form ahead of, or behind a thunderstorm, but this one stayed around longer than they normally do, and lingered over the city.

“This kind of cloud doesn’t pose much of a threat, sometimes what’s behind it or in front of it is much more of a threat, like a thunderstorm,” Quinlan said.

He also said a roll cloud is often formed when there’s a downdraft either before or after the thunderstorm, and then an updraft on the other side of it, which is why you see the up and down motion.