A case study of the application of the quasi-geostrophic omega equation to a baroclinic situation over the Australian region shows substantial discrepancies between the computed omega fields and observed cloud and cloud-free areas. The implications for vertical coupling in the filtered model are discussed and a program suggested which would establish the relative importance of using a more complex form of the omega equation and increasing the vertical and horizontal. resolution.
Downey et al. (Sat,) studied this question.