Snow rollers

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Aliens?
Like the crop circles?
I have never seen anything like it, I am wondering how much wind is needed to roll an 18" roll of snow?
Aliens?
Peter
 
Never had'em around these parts until the whole global warming...er...I mean...climate change fiasco.
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Brian~
 
Well, I once saw it snowing it's butt off, and there was not a cloud in the sky (ended up with over 10"). I also had a deer get in the boat with me while duck hunting (got pix of it if I can find them). But, I have never seen anything like that.
 
I have seen those in Wyoming on a much smaller scale.. Wind blows chunks of snow loose and if things are just right the chunks roll along.

I never saw any more than 3 or 4" in diameter.
 
You also get those in Montana every now and then. These ones are really wide, most of the ones I have seen are much narrower and look like a cinnamon bun on its side.

bob
 
Very interesting! I recently visited Death Valley National Park, where at a playa called "The Racetrack" rocks up to about breadbox size are apparently pushed along by the wind, when the fine clay silt that accumulates in the playa (dry lake) is wet and slick. It was extremely windy while we were there a few weeks ago, 50MPH and gusting higher, enough to push you off balance, and in one place, Ubehebe Crater, visitors were warned to set parking brakes to avoid having cars blown into others! The windblown rocks leave "skidmarks" or shallow furrows in the mud. These snow rollers are a similar phenomenon, evidently, and surprisingly not more common...
 
We had them here a few years ago. It made all the papers then. The explanation is it takes a certain set of conditions to take place. Temp and ground temps need to be just right, its got to snow like all hell to accumulate on the warmer ground, then the wind needs to pick up and blow real hard to get them rolling.

In 61 years, I've seen them once. But they're cool to look at.
 
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