Snow Roller

Snow roller

A snow roller is a rare meteorological phenomenon in which large snowballs are formed naturally as chunks of snow are blown along the ground by wind, picking up material along the way. Unlike snowballs made by people, snow rollers are typically cylindrical in shape, and are often hollow since the inner layers, which are the first layers to form, are weak and thin compared to the outer layers and can easily be blown away, leaving what looks like a doughnut or Swiss roll.

Snow rollers have been seen to grow as large as two feet in diameter, but in order for them to form the ground must be covered by a layer of ice to which snow will not stick (it must be covered by wet, loose snow with a temperature near melting). The wind must be strong enough to move the snow rollers, but not strong enough to blow them too fast. Alternatively, gravity can move the snow rollers on steep hill.

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