By comprehensive analysis the climate characteristics and the influencing systems on rainstorm in Autumn of Hainan Island,it＇s found that： storm rainfall out-breaking,maintaining and weakening has something to do with the continental cold high,low system above the South China Sea and tropical cloud clusters.Storm rainfall is often accompanied with low-level easterly jet at the coastal South China.In the middle troposphere,the positive vertically differential vorticity advection and the warm advection to the south of the Western Pacific Sub-tropical High destroy the quasi-geostrophic balance in the Hainan Island and its neighborhood.The secondary circulation is present by the interaction of dynamical and thermal forcing,result in vertical motion and heavy rain.The unstable stratification is intensified by the dry cold air intrusion in the middle troposphere and the advection of positive differential pseudo-equivalent potential temperature.The strong vertical shear of wind also enhanced the development of convective ascending motion further,and is in favor of the intensification of storm rainfall.These characters can be summarized to form ideas for forecasting the NON-Typhoon storm rainfall in Autumn,so as to serve the potential and nowcasting forecasts of strong convective weathers in Hainan Island.
rainstorm in autumnweather analysisenergy frontmoist available potential energyvertically differentialadvection
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