noun
roll cloud; rotor cloud
A low, horizontal, tube-shaped cloud associated with a gust front or mountain wave. Technical meteorological term.
吊るし雲は、寒冷前線の通過時に見られることがある。
Roll clouds can sometimes be seen when a cold front passes.
山の風下側に吊るし雲が発生した。
A rotor cloud formed on the lee side of the mountain.
Compound of 吊るし (tsurushi, 'hanging') + 雲 (kumo, 'cloud'), describing the cloud's appearance as if suspended.