Based on the methods of value similarity and shape similarity, the consistency characteristics of the echo parameters of two strong convective cell pairs during a strong convective weather process caused by multiple convective monomers in Dalou Mountains in Guizhou Province on April 30, 2015 were analyzed and the time shift (phase shift) technology and mathematical statistical methods were used to analyze the similarity of the convective characteristic parameters of strong convective cell pairs. The results are as follows: (1) The value similarity of the maximum echo intensity Z_max, 0 dBZ height H₀, and 45 dBZ height H₄₅ of the cell pairs were relatively higher, but for the vertical cumulative liquid water content (VIL) it was relatively poor. (2) After processing by using the time shift technique, the change trends of the characteristic parameters of the two cell pairs were more consistent and the degree of similarity was higher. (3) The fluctuation periods of Z_max and VIL of both two cell pairs had good consistency, and fluctuation periods of H₀ and H₄₅ of C and D cell pair had better consistency. (4) The main reason for the poor value similarity of VIL of the cell pairs was the difference in the value of the radar reflectivity factor Z of each scan layer and the vertical height of Z.

Based on the monitoring data of VLF/LF three-dimensional lightning positioning system, MICAPS routine observation data and ground hail observation data, the lightning activity characteristics of a large-scale disaster-causing hail weather process in the slope transition zone of the Yunnan-Guizhou Plateau were analyzed, and the relation between lightning activity and hail falling was discussed. The results are as follows: (1) The stable southern trough in upper level cooperated with the lower level shear line, lower level jet and surface convergence line, which triggered the large-scale hail weather process. (2) The negative ground lightning dominated during the hail weather process, followed by cloud lightning and positive ground lightning. The frequency of total lightning appeared ‘jump increase’ and ‘sharp drop’ phenomena before and after the hail falling in hail area, respectively, and the jump characteristic of lightning frequency change rate more than two standard deviations (2σDFRDT) was obvious before the hail falling, the 2σDFRDT jump signal and peak of total lightning frequency were 20 minutes and 13 minutes ahead of the hail falling, respectively, so two signals had warning indicative significance for hail falling, while the former was better than the later. (3) The spatial distribution of lightning was basically consistent with the moving path of hail cloud, which was an indicator to the development and movement of hail cloud, and the hail areas were mainly located in the right side of lightning position.