Symposium on Numerical Forecasting: Simplified Dynamic Models of the Atmosphere, designed for the Purpose of Numerical Weather Prediction

The properties of several atmospheric models, which have been proposed for the purpose of numerical computation of prognostic maps, are discussed, and a new version of the “2½-dimensional model” is given. It is pointed out that the “barotropic” model is unable to explain adequately the growth of wave perturbations, and that the advective model gives too strong instability for short waves, whereas the two-layer model and the continuous 2½-dimensional model seem to describe almost correctly the behaviour of waves in a baroclinic current.