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Aug 2, 2010 2:22 PM by Bea Karnes, News First 5

Biggest hailstone ever arrives in Colorado

North America's heaviest hailstone ever might also be its most-traveled.

A 1-pound, 15-ounce hailstone that fell in Vivian, South Dakota, in July has been taken to National Center for Atmospheric Research in Boulder, about 370 miles away. Researchers there say they plan to study the giant stone.

It's not clear what tests will be done, but the lab isn't taking any chances. A tweet announcing the arrival of the hailstone said, "Hey, keep that away from the margarita mix!"

The hailstone fell on July 23. Last Friday, federal climate officials confirmed it was the heaviest ever recorded on the continent.

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