What are snow rollers?

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What are snow rollers?

Snow rollers are a very rare phenomenon where snowballs form naturally by a very strong wind blowing across a flat, snowcovered field when the snow is easily compacted (snow temperature near 32 degrees F). The most recent major snow roller event occurred in Illinois on 11 February, 2003. Some beautiful snow roller pictures from that event can be seen here.

Interesting facts:

If you have ever seen snow rollers, you are lucky. Many professional meteorologists go their whole lives with ever seeing this unusual phenomenon.

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