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Print/export Download as PDF; Printable version; In other projects ... Snowflakes form when additional vapor freezes onto an existing ice crystal. [9] [10]
Graupel (/ ˈ ɡ r aʊ p əl /; German: [ˈɡʁaʊpl̩] ⓘ), also called soft hail or snow pellets, [1] is precipitation that forms when supercooled water droplets in air are collected and freeze on falling snowflakes, forming 2–5 mm (0.08–0.20 in) balls of crisp, opaque rime.
Macro photography of a natural snowflake. A snowflake is a single ice crystal that is large enough to fall through the Earth's atmosphere as snow. [1] [2] [3] Snow appears white in color despite being made of clear ice. This is because the many small crystal facets of the snowflakes scatter the sunlight between them. [4]
Accretion is defined as the gradual collection of something over time. [1] In meteorology or atmospheric science it is the process of accumulation of frozen water as precipitation over time as it descends through the atmosphere, in particular when an ice crystal or snowflake hits a supercooled liquid droplet, which then freeze together, increasing the size of the water particle.
An early classification of snowflakes by Israel Perkins Warren. [2] Snow was described in China, as early as 135 BCE in Han Ying's book Disconnection, which contrasted the pentagonal symmetry of flowers with the hexagonal symmetry of snow. [3] Albertus Magnus proved what may be the earliest detailed European description of snow in 1250.
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Electron microscope image of rime ice on both ends of a "capped column" snowflake. Under some specific atmospheric conditions, forming and descending snow crystals may encounter and pass via atmospheric supercooled cloud droplets. These droplets, which have a diameter of about 10 μm, can exist in an unfrozen state down to temperatures near − ...
Frozen granular – Snow whose granules have frozen together. Loose granular – Snow with incohesive granules. Machine-made – Produced by snow cannons, and typically denser than natural snow. New snow – Snow that has fallen since the previous day's report. Packed powder – Powder snow that has been compressed by grooming or by ski traffic.
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