Heaviest Hailstone in Boulder

Heaviest Hailstone In North America Comes To Boulder Lab

BOULDER, Colo. (AP); North America’s heaviest hailstone ever might also be its most-traveled.

A 1-pound, 15-ounce hailstone that fell in Vivian, S.D., on July 23 has been taken to the National Center for Atmospheric Research in Boulder, Colo., about 370 miles away.

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