Weather underground hail history6/20/2023 In the mid-latitudes, hail forms near the interiors of continents, while, in the tropics, it tends to be confined to high elevations. Hail formation requires environments of strong, upward motion of air within the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level. Hail is possible within most thunderstorms (as it is produced by cumulonimbus), as well as within 2 nmi (3.7 km) of the parent storm. The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while smaller hailstones and graupel are coded GS. Unlike other forms of water ice precipitation, such as graupel (which is made of rime ice), ice pellets (which are smaller and translucent), and snow (which consists of tiny, delicately crystalline flakes or needles), hailstones usually measure between 5 mm (0.2 in) and 15 cm (6 in) in diameter. Ice pellets generally fall in cold weather, while hail growth is greatly inhibited during low surface temperatures. It consists of balls or irregular lumps of ice, each of which is called a hailstone. It is distinct from ice pellets (American English "sleet"), though the two are often confused.
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