Monday, January 26, 2009

MPR: Updraft: Snow rollers


MPR: Updraft: Snow rollers: "Weather has some strange ways of making really cool things. One example is snow rollers. They are fairly rare, but given the right conditions they do occur.
Snow rollers form when the snow has just the right combination of sticky snow that is light enough to be moved by wind. If the wind is strong enough, it picks up snow crystals and begins to tumble them over across 'downstream' snow cover. Soon a little mini snowball forms. As it grows and increases surface area, the wind gusts push sheets of snow along."

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