A rare, naturally occurring cylinder of snow, resembling a small, loosely wound bale of hay, formed when a chunk of snow is picked up and rolled along the ground by wind or gravity on a slope, gathering additional layers as it goes. Snow rollers require a precise combination of a light, sticky surface layer of wet snow atop a slicker, non-sticky base layer, along with the right wind or slope conditions, making them an unusual sight even where snowfall is regular.
Facts
Identification
Distinguishing AppearanceCylindrical and often hollow, resembling a doughnut or Swiss roll 1 ScaleFrom tennis-ball size to larger than a car; most are a few inches or centimeters wide 1 Sources
1. Snow roller - Wikipedia
Size
They can be as small as a tennis ball, but they can also be bigger than a car.
Description
The inner sections can easily be blown away, leaving what looks like a doughnut or Swiss roll.
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