Vortex cloud - Uzujouun

Japanese: 渦状雲 - うずじょううん
Vortex cloud - Uzujouun

…Rain-making thunderstorm [Isamu Kurata]
[Cloud shapes seen from satellites]

[Band-like clouds]
At points where air currents converge (convergence zones), such as fronts, the air rises and forms clouds, creating a wide band of clouds.
[Vortex cloud]
Around the center of a low pressure system (including typhoons), the air rotates and rises, causing vortex clouds to appear. In typhoons, the spiral bands can be seen on a spectacularly large scale.

*Some of the terminology that refers to "vortex clouds" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…雨乞い雨雷【倉田 勇】
【衛星から見た雲の形体】

[バンド状雲]
 前線など気流が集まるところ(収束帯)では空気は上昇し雲をつくるため,幅広いバンド状の雲ができる。
[渦状雲]
 低気圧の中心(台風を含む)付近は空気は回転上昇するので渦状の雲が現れる。台風ではスパイラルバンドが見事に大規模な形で見られる)。…

※「渦状雲」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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