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Hail is possible within most thunderstorms as it is produced by cumulonimbi, and within 2 nautical miles (3.7 km) of the parent storm. Hail formation requires environments of strong, upward motion of air with the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level.ny thunderstorm which produces hail that reaches the ground is known as a hailstorm. Hail has a diameter of 5 millimetres (0.20 in) or more. Hailstones can grow to 15 centimetres (6 in) and weigh more than 0.5 kilograms (1.1 lb). Unlike ice pellets, hailstones are layered and can be irregular and clumped together.
Hail requires strong updrafts to keep the hydrometeors suspended to accumulate ice. The only clouds that can normally support these updrafts are cumulus or cumulonimbus (thunderstorm) clouds. Hail requires TWO elements.One is an updraft and the other is that the water inside the cloud reaches the freezing level.This normally occurs only in cumulus or cumulonimbus clouds that extend to fairly high altitudes. Fair weather cumulus, for example, do not obtain the needed height to reach the freezing level.ail requires TWO elements. One is an updraft and the other is that the water inside the cloud reaches the freezing level. This normally occurs only in cumulus or cumulonimbus clouds that extend to fairly high altitudes. Fair weather cumulus, for example, do not obtain the needed height to reach the freezing level.