Mysterious Snow Rollers!

mysterious-snow-rollers

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 happen with the combination of lying snow and high wind speeds, mostly in North America and Northern Europe, and they can be as small as a tennis ball or they can be as large as two feet across – depending on how strong the wind is and how smooth the surface of the snow is. Gravity can also assist snow roller formation. An inclined surface often needs just a little shove from the wind to get snow rollers in motion.” w/ photos

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