| 翻訳と辞書 |
rainband
A rainband is a cloud and precipitation structure associated with an area of rainfall which is significantly elongated. Rainbands can be stratiform or convective,〔Glossary of Meteorology (2009). (Rainband. ) Retrieved on 2008-12-24.〕 and are generated by differences in temperature. When noted on weather radar imagery, this precipitation elongation is referred to as banded structure.〔Glossary of Meteorology (2009). (Banded structure. ) Retrieved on 2008-12-24.〕 Rainbands within tropical cyclones are curved in orientation. Tropical cyclone rainbands contain showers and thunderstorms that, together with the eyewall and the eye, constitute a hurricane or tropical storm. The extent of rainbands around a tropical cyclone can help determine the cyclone's intensity.
Rainbands spawned near and ahead of cold fronts can be squall lines which are able to produce tornadoes. Rainbands associated with cold fronts can be warped by mountain barriers perpendicular to the front's orientation due to the formation of a low-level barrier jet. Bands of thunderstorms can form with sea breeze and land breeze boundaries, if enough moisture is present. If sea breeze rainbands become active enough just ahead of a cold front, they can mask the location of the cold front itself. Banding within the comma head precipitation pattern of an extratropical cyclone can yield significant amounts of rain or snow. Behind extratropical cyclones, rainbands can form downwind of relative warm bodies of water such as the Great Lakes. If the atmosphere is cold enough, these rainbands can yield heavy snow.
==Extratropical cyclones==
Rainbands in advance of warm occluded fronts and warm fronts are associated with weak upward motion,〔Owen Hertzman (1988). (Three-Dimensional Kinematics of Rainbands in Midlatitude Cyclones. ) Retrieved on 2008-12-24〕 and tend to be wide and stratiform in nature.〔Yuh-Lang Lin (2007). (Mesoscale Dynamics. ) Retrieved on 2008-12-25.〕 In an atmosphere with rich low level moisture and vertical wind shear,〔Richard H. Grumm (2006). (16 November Narrow Frontal Rain band Floods and severe weather. ) Retrieved on 2008-12-26.〕 narrow, convective rainbands known as squall lines generally in the cyclone's warm sector, ahead of strong cold fronts associated with extratropical cyclones.〔Glossary of Meteorology (2009). (Prefrontal squall line. ) Retrieved on 2008-12-24.〕 Wider rain bands can occur behind cold fronts, which tend to have more stratiform, and less convective, precipitation.〔K. A. Browning and Robert J. Gurney (1999). (Global Energy and Water Cycles. ) Retrieved on 2008-12-26.〕 Within the cold sector north to northwest of a cyclone center, in colder cyclones, small scale, or mesoscale, bands of heavy snow can occur within a cyclone's comma head precipitation pattern with a width of to .〔KELLY HEIDBREDER (2007). (Mesoscale snow banding. ) Retrieved on 2008-12-24.〕 These bands in the comma head are associated with areas of frontogensis, or zones of strengthening temperature contrast.〔David R. Novak, Lance F. Bosart, Daniel Keyser, and Jeff S. Waldstreicher (2002). (A CLIMATOLOGICAL AND COMPOSITE STUDY OF COLD SEASON BANDED PRECIPITATION IN THE NORTHEAST UNITED STATES. ) Retrieved on 2008-12-26.〕 Southwest of extratropical cyclones, curved flow bringing cold air across the relatively warm Great Lakes can lead to narrow lake effect snow bands which bring significant localized snowfall.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「rainband」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|