Snow Rollers

I’ve never heard of these before…

From KTVB.com

Rare weather event produces spontaneous snowballs in Idaho

BOISE – Thousands of snowballs rolled in a flat central Idaho field look like the work of hundreds of ambitious kids – except there are no human tracks.

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A rare weather event caused the spontaneous snowballs at the Nature Conservancy’s Silver Creek Preserve and surrounding fields near the tiny town of Picabo.

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Preserve manager Sunny Healey spotted the cylindrical shapes up to 18 inches high on Jan. 30 following an overnight windstorm.

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She says she had never seen them before but a local rancher told her he’s spotted them twice in previous decades.

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Jay Breidenbach of the National Weather Service says so-called snow rollers are caused by an unusual combination of a couple of inches of snow with the right water density and temperatures near freezing, followed by strong winds.

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