Numerical simulation of a midlatitude squall line in two dimensions

Abstract

These model storms have, within the constraints of the model's geometry, replicated the basic multicellular character and general line-normal airflow typical of these lines. The structure and intensity of the subcloud cold air pool and the propagation speeds developed by the storms appear to be reasonable. Further, it was found that the initial conditions chosen resulted in model storms which were not only long-lasting but also essentially repetitive, indicating that a state of quasi-equilibrium had been attained. The storms did not decay because the environmental conditions ahead of the storms were favorable and essentially unchanged during the course of the simulations. The inclusion of ice phase processes resulted in the production of more realistic appearing features in the trailing portion of the storm as well as more widespread precipitation. -from Authors