Snow roller

A snow roller is a rare meteorological phenomenon in which cylindrical snowballs are formed naturally as chunks of snow roll down hill or are blown along the ground by wind, picking up further snow along the way, in much the same way that the large snowballs used in snowmen are made.

They can be as small as a tennis ball, but they can also be bigger than a car.

[1] Most snow rollers are a few inches or centimeters wide.

The inner sections can easily be blown away, leaving what looks like a doughnut or Swiss roll.

[1] However, the precise nature of the conditions required makes them a very rare phenomenon.