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Hail is a form of solid precipitation. it consists of balls or irregular lumps of ice, each of which is referred to as a hailstone. unlike graupel, which is made of rime, and ice pellets, which are smaller and translucent, hailstones – on earth – consist mostly of water ice and measure between 5 and 200 millimetres (and in) in diameter. the metar reporting code for hail 5 mm or greater is gr, while smaller hailstones and graupel are coded gs.