noun
cap cloud
A lens-shaped cloud that forms over a mountain peak, resembling a traditional Asian bamboo hat (笠). Used in meteorology and mountain descriptions.
富士山に笠雲がかかると、天気が崩れると言われている。
It is said that when a cap cloud forms over Mt. Fuji, the weather will turn bad.
笠雲は山頂付近の強い風によって発生する。
Cap clouds are formed by strong winds near the mountain summit.