晴せい天てん乱らん気き流りゅう

noun

clear-air turbulence

Technical meteorological term for sudden, invisible turbulence in cloudless skies, often encountered by aircraft.

• 晴せい天てん乱らん気き流りゅうはレーダーで探たん知ちしにくいため、パイロットにとって危き険けんです。

  Clear-air turbulence is dangerous for pilots because it is difficult to detect by radar.

• 飛ひ行こう機きが晴せい天てん乱らん気き流りゅうに巻まき込こまれて、機き体たいが大おおきく揺ゆれた。

  The aircraft encountered clear-air turbulence and shook violently.