Horizontal domain partitioning of the Navy atmospheric primitive equation prediction model

Development of the Kesel-Winninghoff multi-layer baroclinic primitive equation atmospheric prediction model began at the Fleet Numerical Weather Central, Monterey, California, in late 1968. The model, herein referred to as the Primitive Equation Model (PEM), was initially written as a single processor version to be executed in one of the dual processors of one of the two FNWC CDC 6500 dual processor computer systems. This version, however, required slightly over six and one-half hours to compute a set of 72 hour predictions.