Hail is a form of solid precipitation. It consists of balls or irregular lumps of ice, each of which is referred to as a hail stone. Unlike graupel, which is made of rime, and ice pellets, which are smaller and translucent, hail stones – on Earth – consist mostly of water ice and measure between 5 and 200 millimetres (0.20 and 7.9 in) in diameter. The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while smaller hailstones and graupel are coded GS. Hail is possible within most thunderstorms as it is produced by cumulonimbi (thunderclouds), 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. 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. Hail stones 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 hail stones can slow their descent through Earth's atmosphere. Severe weather warnings are issued for hail when the stones reach a damaging size, as it can cause serious damage to human-made structures and, most commonly, farmers' crops.
Other articles related to "hail":
... The Alberta Hail Project was a research project sponsored by the Alberta Research Council and Environment Canada to study hailstorm physics and ... other platforms to conduct research into precipitation mechanisms, severe storm development, hail suppression, hydrology and microwave propagation ...
... Any form of thunderstorm that produces precipitating hailstones is known as a hail storm ... Hailstorms are generally capable of developing in any geographic area where thunderclouds (Cumulonimbus) are present, although they are most frequent in tropical and monsoon regions ...
... McConnell wrote the first school song titled, "Hail, M.T.N!" The music is the 19th Century Russian national anthem, God Save The Tsar!, composed by Alexei Lvov ... Hail, M.T.N ... all hail! Noble and strong! To thee with one accord, We raise our song ...
... Upon Hollow" – 242 "Camouflage" – 507 "Lieblos Hin Zur Dunkelheit" – 233 "Hail Hail Hail II" – 240 "Here's an Ode" – 316 "I Shall Feast ...
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Hail divinest Melancholy,
Whose saintly visage is too bright
To hit the sense of human sight,
And therefore to our weaker view
Oerlaid with black, staid Wisdoms hue;”
—John Milton (16081674)
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There springs the perfect order of speech, and the beauty of incantation.”
—T.S. (Thomas Stearns)