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Hail is a form of solid precipitation. [1] It is distinct from ice pellets (American English "sleet"), though the two are often confused. [2] It consists of balls or irregular lumps of ice, each of which is called a hailstone. [3] Ice pellets generally fall in cold weather, while hail growth is greatly inhibited during low surface temperatures.
Furthermore, the hailstone's speed depends on its position in the cloud's updraft and its mass. This determines the varying thicknesses of the layers of the hailstone. The accretion rate of supercooled water droplets onto the hailstone depends on the relative velocities between these water droplets and the hailstone itself.
The hailstone then may undergo 'wet growth', where the liquid outer shell collects other smaller hailstones. [41] The hailstone gains an ice layer and grows increasingly larger with each ascent. Once a hailstone becomes too heavy to be supported by the storm's updraft, it falls from the cloud. [42]
the cloud IR emissivity, with values between 0 and 1, with a global average around 0.7; the effective cloud amount, the cloud amount weighted by the cloud IR emissivity, with a global average of 0.5; the cloud (visible) optical depth varies within a range of 4 and 10. the cloud water path for the liquid and solid (ice) phases of the cloud particles
The largest diameter hailstone known, measuring 7.87 in (20.0 cm) in diameter and weighing 1.9375 lb (0.88 kg), fell on Vivian during an exceptional hailstorm. [27] 5 October 2010 Phoenix, Arizona, US The 5 Oct. hailstones - some exceeding 2 inches in diameter - pounded cars, smashed windows and blasted apart roof tiles and shingles. The storm ...
This superhero comedy still holds up with its great effects (for the time), plus a fun, fast-paced script—and a stellar cast that perfectly embodies a hilarious variety of high school movie cliches.
Clouds form as relatively warmer air, carrying moisture, rises within cooler air. The moist air rises, and, as it does so, it cools and some of the water vapor in that rising air condenses . [ 10 ] When the moisture condenses, it releases energy known as latent heat of condensation, which allows the rising packet of air to cool less than the ...
Cloud seeding in the United Arab Emirates is a weather modification technique used by the government to address water challenges in the country. Cloud seeding is also referred to as man made precipitation and artificial rain making. [61] The United Arab Emirates is one of the first countries in the Persian Gulf region to use cloud seeding ...