Cloud-environment interface instability. Part II: extension to three spatial dimensions

It is shown that the analytical theory developed in Part I, which describes the evolution of the laminar interface between the thermal and its environment, applies to the three-dimensional case with only minor modifications. As in the two-dimensional case, the scale selection and growth rate of the unstable modes appear to depend upon the depth and velocity change across the shear layer near the interface, which is in rough agreement with classical linear theory developed for the case of planar geometry. Analysis is presented that indicates further evolution of the three-dimensional eddies results in a transition to turbulence. -from Authors