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Rare Phenomenon of 'Ice Volcanoes' Seen on Lake Michigan

A combination of very cold temperatures and large waves created the rare phenomenon of "ice volcanoes" along the shore of Lake Michigan over the weekend. The cone-shaped mounds of ice form as water bursts through the ice shelf. "It needs to stay cold enough to keep the ice around," explained Cort Spholten, a National Weather Service meteorologist stationed at Grand Rapids, "and waves need to be large enough to force water upwards against the ice shelf."

The ice volcanoes follow just on the heels of another curious phenomenon, when thousands of ice balls rolled up onto Lake Michigan's shore. More on the icy rarities at the Detroit Free Press. Photos of the ice volcanoes by National Weather Service meteorologist Ernie Ostuno.

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