Hail Wallpaper

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Hail is a form of solid precipitation. It is distinct from ice pellets though the two are often confused. It consists of balls or irregular lumps of ice each of which is called a hailstone. Ice pellets falls generally in cold weather while growth is greatly inhibited during cold surface temperatures.

Unlike other forms of water ice such as graupel which is made of rime and ice pellets which are smaller and translucent hailstones usually measure between 5 millimetres and 15 centimetres in diameter. The METAR reporting code for hail 5 mm or greater is GR while smaller hailstones and graupel are coded GS.

Hail is possible within most thunderstorms as it is produced by cumulonimbus and within 2 nautical miles of the parent storm. Hail formation requires environments of strong, upward motion of air with the parent thunderstorm 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.

There are methods available to detect hail-producing thunderstorms using weather satellites and weather radar imagery. Hailstones generally fall at higher speeds as they grow in size though complicating factors such as melting friction with air wind and interaction with rain and other hailstones can slow their descent through Earth's atmosphere. Severe weather warnings are issued when the stones reach a damaging size as it can cause serious damage to human-made structures and most commonly farmers' crops.

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