Abstract: Based on several examples of radar observations in the North Caucasus and the Republic of Moldova, the renewal of deep convective cloud systems (storms) due to feeder clouds are investigated. It is shown that the direction of the renewal band coincides with the storm evolution vector. The structure of the renewal band for multicell and supercell storms differs, because the supercells contain the mesocyclones that generate convergent flows around the center of rotation. A new phenomenon was found: two multicell storms merged at a node of a mesoscale convective structure and then split up and continued to develop along divergent trajectories. The study results are applicable in hail protection, precipitation redistribution operations, and storm warning of the population.