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Squall
A squall is a sudden, sharp increase in wind speed which is usually associated with active weather, such as rain showers, thunderstorms, or heavy snow.〔The Weather Channel. (Weather Glossary: S. ) Retrieved on 2006-11-19.〕 Squalls refer to an increase in the sustained winds over a short time interval, as there may be higher gusts during a squall event.〔Australian Bureau of Meteorology. (Weather Words. ) Retrieved on 2006-11-19.〕 They usually occur in a region of strong mid-level height falls, or mid-level tropospheric cooling, which force strong localized upward motions at the leading edge of the region of cooling, which then enhances local downward motions just in its wake.
==Etymology==
There are different versions of the word's origins:
* By one version, the word appears to be Nordic in origin, but its etymology is considered obscure. It probably has its roots in the word ''skvala''〔(squall: Definition and Much More from Answers.com )〕 an Old Norse word meaning literally, ''to squeal''.〔Georoots News. (Georoots News V.1#5: Changes in the Wind. ) Retrieved on 2006-12-30.〕
* By another version, it is an alteration of ''squeal'' influenced by ''bawl''.
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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