funnel cloud; pendant cloud
A rotating, funnel-shaped cloud extending from a cumulonimbus base, not reaching the ground. Used in weather reports and meteorology.
The Japan Meteorological Agency announced that a funnel cloud was observed beneath a cumulonimbus cloud.
Compound of 漏斗 (ろうと, 'funnel') + 雲 (くも, 'cloud'), literally 'funnel cloud'.