Abstract
Numerical simulations of the evolution of the downslope wind were performed by means of the non-hydrostatic, compressible model including the effect of topography.
Result of numerical simulation with the famous Boulder windstorm-like profile as an upstream condition was examined in some detail. It was ascertained, in the example, that the violent wind on the leeside slope of the mountain, whose instantaneous wind speed rose well over 50 m/sec, was due to the amplification mechanism with the occurrence of wave breaking, or in other words, the mountain wave-induced critical level, particularly in the lower troposphere.
The characteristic features of the circulations in the troposphere as well as in the stratosphere are described briefly. The possibility of occurrence of such severe windstorms in Japan due to the mechanism mentioned above was also investigated.
