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World's weirdest weather

By: Laura Moss on Sept. 1, 2010, 12:05 p.m.
record-setting hailstone

Photo: National Weather Service/AP

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Giant hailstones

Exceptionally large hailstones, sometimes called ice bombs, typically fall from the sky during severe thunderstorms and shatter into smaller chunks when they hit the ground. Hail is usually smaller than a softball, but an ice bomb once weighed in at 80 pounds. In comparison, the largest hailstone to ever fall in the U.S. was found in Vivian, S.D., on July 23, 2010, and was 8 inches in diameter and weighed 1 pound, 15 ounces.