weather phenomenon

I tried to do this a few days ago. It's just too good to keep. There have been articles in newspaper all over the world about this.
My granddaughter managed to pick a hug one up, a big as her, it was light as a feather. It looks like you could push one to keep it rolling, but they just crumble.
Snowrollers. A light fluffy snow on top of a crust of old snow and strong winds start these rollers and push 'em along. They leave squibbly lines behind them.
They were on hillsides, fields, frozen lakes, rooftops. And there were hundreds in spots of all sizes. The one is about 4 feet in diamenter.
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