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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bounded weak echo region ： ウィキペディア英語版 Bounded weak echo region The bounded weak echo region, also known as a BWER or a vault, is a radar signature within a thunderstorm characterized by a local minimum in radar reflectivity at low levels which extends upward into, and is surrounded by, higher reflectivities aloft. This feature is associated with a strong updraft and is almost always found in the inflow region of a thunderstorm. It cannot be seen visually. The BWER has been noted on radar imagery of severe thunderstorms since 1973 and has a lightning detection system equivalent known as a ''lightning hole''.〔Martin J. Murphy and Nicholas W. S. Demetriades. (An Analysis of Lightning Holes in a DFW Supercell Storm Using Total Lightning and Radar Information. ) Retrieved on 2008-01-08.〕 == Description and attributes == The BWER is a nearly vertical channel of weak radar echo, surrounded on the sides and top by significantly stronger echoes. The BWER, sometimes called a vault, is related to the strong updraft in a severe convective storm that carries newly formed atmospheric particulates, called hydrometeors, to high levels before they can grow to radar-detectable sizes. BWERs are typically found at mid-levels of convective storms, to above the ground, and are a few kilometers in horizontal diameter. Identifying the location of the updraft region is important because it is linked to locations where severe weather normally occurs.〔Advanced Warning Operations Course. (IC 3-I-B: 1. Storm Interrogation. ) Retrieved on 2008-01-08.〕 The presence of a BWER has been part of a method to diagnose thunderstorm strength as part of the Lemon technique since 1977.〔Leslie R. Lemon. New severe thunderstorm radar identification techniques and warning criteria: a preliminary report. Techniques Development Unit, National Severe Storms Forecast Center, Kansas City, Missouri, July 1977.〕 The updraft strength within the BWER supports the growth of large hailstones just above the vault, which can be displaced slightly into the direction of motion of the parent supercell storm.〔William R. Cotton and Roger A. Pielke. (Human Impacts on Weather and Climate. ) Retrieved on 2008-01-08.〕 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「Bounded weak echo region」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.