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Tatsumi (1986) proposed a spectral limited area model with time depenbent lateral boundary condition and successfully applied the spectral method to the Japan Meteorological Agency (JMA) operational 12-level fine-mesh limited area Asia model (FLM). We applied the proposed spectral method to the JMA operational 13-level very-fine-mesh Japan model (VFM). The VFM has twice as fine a resolution as the FLM, and it includes more sophisticated physical processes than the FLM. The forecast comparison of the grid and the spectral VFMs shows that the spectralVFM is superior to the grid-VFM for the forecast of a rapidly developing cyclone near the Japan Islands by its forecast position and surface pressure of the cyclone center. We conclude that the developed cyclone characterized by the concentrated strong vortex near the center might be better resolved by the spectral-VFM than by the grid-VFM. Except near the cyclone center the two VFMs produced substantially the same forecast. The advantage of the spectral-VFM is presumably due to the fact which Tatsumi (1986) pointed out that the spectral method : a) has no computational dispersion, b) is free from systematic retardation of phase speed, and c) completely excludes aliasing error.

A Spectral Limited-area Model with Time-dependent Lateral Boundary Conditions and Its Application to a Multi-level Primitive Equation Model