Snow rolls — joke windy winter

Large, barrel-like, or small and fragile as cotton candy, snow rolls (eng. Snow rollers) are formed on the slopes of the hills, when a stray wind rolls the wet snow on the ground.

Driven by the wind, clumps of flakes, bend and twist. The result is a hollow cylindrical coil with a thin inner layer. Depending on the size and shape, it can be called snow roll, a stack or a donut.

Snow rolls are rare — about once in a few years — and require a combination of many factors. First, necessary thin surface layer of moderately wet snow. Underneath should be a layer of powdery snow or ice below the surface layer could climb and roll, when the wind blows, don't stick to it. The wind is also not so simple — it needs to be strong enough to lift and roll the snow, but not to sweep at all.

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