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Spain experienced a giant hailstorm in January of 2000 when giant ice chunks dropped from a seemingly cloudless sky. For 10 days, the country was accosted by hail that crushed car hoods and windshields, seriously injuring anyone who got in the way. More than 15 basketball-sized hailstones were discovered in the onslaught, the largest weighting in a 2.25 pounds (1.02 kg).
I can't find the original thread of Weather Facts....