Abstract
A linear instability theory in clouds is developed to explain both the formation mechanism of the uneven structure on the surface of the convective cloud and the mixing or entrainment process.
This instability is a generalization of the conditional instability which is usually discussed in a stratification which is static and horizontally uniform.
In clouds, on the other hand, the stratification of pressure, temperature, water-vapor mixing ratio and cloud water mixing ratio are tilted against the horizon and the wind blows.
At the same time, a simple model of the parameterization of eddy effect inside a cloud is proposed by using this instability theory.
