Traditionally hail stones are formed when water vapor solidifies in extremely cold atmospheric conditions, usually well below freezing. Accordingly, hail must remain cold in order to maintain its solidity, which it can do for a relatively long fall. However once temperatures begin to stay above freezing, the stones begin to melt. Because of this, many hail storms form below 11,000 feet up and rarely occur when temperatures are warm enough to prevent their formation in the first place.
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