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Ice pellets
Ice pellets are a form of precipitation consisting of small, translucent balls of ice. Ice pellets are smaller than hailstones〔(【引用サイトリンク】title= Hail (glossary entry) )〕 which form in thunderstorms rather than in winter, and are different from graupel ("soft hail") which is made of frosty white rime, and from a mixture of rain and snow which is a slushy liquid or semisolid. Ice pellets often bounce when they hit the ground or other solid objects, and make a higher-pitched "tap" when striking objects like jackets, windshields, and dried leaves, compared to the dull splat of liquid raindrops. Pellets generally do not freeze into a solid mass unless mixed with freezing rain. The METAR code for ice pellets is PL (PE before November 1998〔(【引用サイトリンク】title=USA and International Code Change For Ice Pellets )〕).
== Terminology ==
Ice pellets are known to Americans as sleet, the official term used by the U.S. National Weather Service.〔(【引用サイトリンク】title= Sleet (glossary entry) )〕 However, the term sleet refers to a mixture of rain and snow in most Commonwealth countries,〔(【引用サイトリンク】title=sleet Meaning in the Cambridge English Dictionary )〕 including Canada. Because of this, Environment Canada never uses the term ''sleet'', and uses the terms "ice pellets" or "wet snow" instead.〔Chris St. Clair, Canada's Weather, p. 55, Firefly Books, 2009. ISBN 1-55407-338-3〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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