by ZAMG and DHMZ
There is some overlap between the different conceptual models. The third type is often seen when there is intensive convective development under the influence of cold and dry air at upper levels, originating from the rear side of the frontal cloud band. This seems to be very similar to MCS developments described in the relevant chapter. (see
Appearance in vertical cross section
The two other types of model lie within the uniform air mass of a rising warm conveyor belt and, as such, also consist of non-convective cloudiness, although convection will occur very often, especially in summer time.
On the basis of an observed, dominating warm conveyor belt, the isolated type will be signified as "warm conveyor belt".
Consequently only the second type is regarded and diagnosed as Thickness Ridge Cloudiness.