Mesoscale Diagnostic Analysis of a Strong Convective System in Jiangsu Province

A large-scale strong convection which is occurred in Jiangsu Province on August 6 2015 is diagnosed and analyzed from various angles using reanalysis data, surface observation data and the new generation radar data. The main conclusions are the followings: the ground squall line is the direct impact system of this strong convection. The upper air is dry and cold and the low level is warm and humid. During this convection, the wind direction is suddenly changed, wind speed is shot up, the pressure is upwelling, the temperature is dropped sharply, and the relative humidity rises sharply. The atmosphere energy is accumulated in the ground, there is an energy front area between the middle level and lower level, the strong vertical rising speed, the low-level convergence and high-level divergence of water vapor flux are the favorable factors for heavy precipitation. The radar echo shows that there is a clear gust front on the right side of the thunderstorm in Liuhe area, simultaneously, and there is a distinct weak narrow-band in the left front of the echo, corresponding to the outflow boundary of the rear side of the thunderstorm. In addition, the center of the radar echo is observed decline rapidly in the vertical direction. The above characteristics have a good indication of the prediction of severe winds.