ABSTRACT
This chapter describes the use of the different numerical techniques to construct a simple numerical weather prediction model. The illustration documents a barotropic nondivergent model. The barotropic model is based on the vorticity conservation concept. Several experiments have been carried out with barotropic models and have shown their usefulness for tropical wind prediction especially at those levels where the divergence is small. One of the problems inherent to limited area grid point models is the specification of the boundary conditions. The solution of the governing equations depends continuously on the boundary values which makes the problem very sensitive to their specification. In order to avoid the generation of unbounded vorticity and kinetic energy during the model integration, it is imperative that the integral properties of the barotropic nondivergent model be conserved in the finite difference analogues of the predictive equations.
