Numerical simulation of the Yamaji-kaze with a non-hydrostatic model

Abstract

A three-dimensional non-hydrostatic anelastic model using a radiative-nesting lateral boundary condition is applied to the simulation of the Yamaji-kaze on 27 September 1991 caused by the Typhoon 9119. A 2.5 km-resolution model, which is double-nested with the operational forecast model of the Japan Meteorological Agency, successfully simulates the downslope wind and associated internal hydraulic jump in the lee of the Shikoku Mountains. The model-simulated wind reproduces well the time change of the observed wind, including the abrupt increase of the southerly wind (onset of the Yamaji-kaze).