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Hail is a form of precipitation which consists of balls or irregular lumps of ice (hailstones), 5 mm–50 mm in diameter on average, with much larger hailstones from severe thunderstorms[1]. Hail is always produced by cumulonimbi (thunderclouds), and is composed of transparent ice or alternating layers of transparent and translucent ice at least 1 mm thick. Small hailstones are less than 5 mm in diameter, and are reported as SHGS. Unlike ice pellets, they are layered and can be irregular and clumped together.