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| Haines Index ： ウィキペディア英語版 |
Haines Index
Haines Index (also known as Lower Atmosphere Severity Index) is a weather index developed by meteorologist Donald Haines in 1988 that measures the potential for dry, unstable air to contribute to the development of large or erratic wildland fires.〔(【引用サイトリンク】url=http://web.archive.org/web/20140416182854/http://www.ncrs.fs.fed.us/4401/focus/haines/ )〕 The index is derived from the stability (temperature difference between different levels of the atmosphere) and moisture content (dew point depression) of the lower atmosphere. This data may be acquired with a radiosonde or simulated by a numerical weather prediction model. The index is calculated over three ranges of atmospheric pressure: low elevation (950-850 millibars (mb)), mid elevation (850-700 mb), and high elevation (700-500 mb).〔(Noaa )〕
A Haines Index of 6 means a high potential for an existing fire to become large or exhibit erratic fire behavior, 5 means medium potential, 4 means low potential, and anything less than 4 means very low potential.〔(【引用サイトリンク】url=http://www.publish.csiro.au/?paper=WF06086 )〕
== References ==
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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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