'I've never really heard of any eyewitnesses to snow rollers.' - David Phillips, Environment CanadaSeeing the "snow rollers" actually form is rarer still, Phillips said. "I've never really heard of any eyewitnesses to snow rollers," Phillips said. A variety of factors need to occur in precise order for snow rollers to form, said Phillips. "Conditions need to be nearly perfect for snow rollers to form," he said.

Source: CBC News February 02, 2018 21:58 UTC