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Last Updated: Monday August 02 2010 17:56 GMT

Biggest hailstone ever recorded found in America

Check out this massive hailstone that fell in America - it's the size of a small football and is the biggest hailstone ever recorded!

It fell during a big storm in the town of Vivian, South Dakota, which caused lots of damage.

Hail is created inside storm clouds and is made of solid ice. During the storm, falling chunks of ice smashed through roofs of houses and car windows.

This hailstone measured 20.5cm wide and weighed in at almost 1kg - about the same as a large tub of butter!