Hail formation requires environments of strong, upward motion of air within the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level. In the mid-latitudes, hail forms near the interiors of continents, while, in the tropics, it tends to be confined to high elevations.
Hail falls when it becomes heavy enough to overcome the strength of the thunderstorm updraft and is pulled toward the earth by gravity. Smaller hailstones can be blown away from the updraft by horizontal winds, so larger hail typically falls closer to the updraft than smaller hail.
Hail, precipitation of balls or pieces of ice with a diameter of 5 mm (about 0.2 inch) to more than 15 cm (about 6 inches). In contrast, ice pellets (sleet; sometimes called small hail) have a diameter less than 5 mm.
This article explores the definition of hail, its formation process, the factors influencing its development, its varying sizes, and how it differs from other forms of precipitation like graupel, sleet, and snow. What Is Hail? Hail is a type of solid precipitation that forms during thunderstorms.
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