This photo taken July 24, 2010 provided by the NOAA National Weather Service shows a hailstone that was found by a ranch hand in Vivian, S.D., on June 23, 2010. The hailstone has set U.S records. It measured 8 inches in diameter and weighed 1 pound, 15 ounces. The previous record for diameter was 7 inches for a hailstone found in Aurora, Neb., in 2003. The previous record for weight was 1.67 pounds for a stone in Coffeyville, Kan., in 1970. ((AP Photo/National Weather Service))
August 2, 2010 12:10:00 PM PDT
BOULDER, Colo. (AP) - August 2, 2010 --
North America's heaviest hailstone ever might also be its most-traveled.