Based on basic reflectivity of Doppler radar,radial velocity and wind shear result calculated via radial velocity,a typical supercell hailstorm was analyzed.It was found that strong echo appeared in the middle level of volume scan during the beginning of storm and the converging radial wind indicated the increasing echo;with the development of storm,the converging radial wind increased gradually and tended to extend vertically,which reveals that the influx of warm and damp air provides enough vapor and heat.In the fastigium of storm,bounded weak echo region and V-shape gap can be observed;moreover,there was a mesocyclone in the radial velocity field.Vertical shear reflected environment field that wind rotated in clockwise with the increase of height,warm and damp influx at low altitude,the dry and cold air diverging at high altitude and the spatial distribution of ascending air flow at the middle level;during the dispersing of storm,the divergence of radial wind transformed to lower level gradually and its convergence reduced with strong echo disappeared.
