Characteristics of a supercell storm with long life cycle based on analysis of weather radar data

Using datasets of routine upper-air and surface weather observations,surface automatic weather station,Doppler weather radar at Shijiazhuang,dual-polarization radar at Raoyang and other relevant data,we have conducted a detailed analysis on the atmospheric circulation environment and radar observed characteristics of a supercell storm with long life cycle that affected the central and southern Hebei on 13 June 2018. The main results are as follow. (1) This supercell occurred under the atmospheric circulation of the revising of a transverse trough at the back of vortex. (2) The life cycle of the storm is 204 min long,during which the supercell lasted for 138 min,and the maximum radar reflectivity factor is basically maintained above 65 dBz during this period. (3) The deep and strong development of a mesocyclone is an important dynamic mechanism for the development and maintenance of the supercell storm. The bottom of the mesocyclone can reach the bottom of the storm,and the top height of the mesocyclone had li