https://doi.org/10.1351/goldbook.C01442
Detached, dense clouds with a dome-shaped upper surface with sharp-edged, rounded protuberances and a nearly horizontal base; \(600{-}6000\ \text{m}\) or more; convective motion with rising, large bubbles of warm air with vertical speeds of \(1{-}5\ \text{m s}^{-1}\).