Abstract
Abstract In a few selected cases of explosive cyclogenesis, a “coarse-mesh” nine-level isentropic prediction model conserving potential geostrophic vorticity is shown to yield dependable 36-hr forecasts of developing cyclones. Stagnant cyclones in adjacent areas are handled with the same degree of accuracy, indicating that numerical instability in the model is not a likely cause of the spontaneous cyclonic development. Tentative conclusions are drawn about the advantages of isentropic, as opposed to isobaric, objective analysis.
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