In this paper, based on the analyses of 41 severe local storm clusters which were associated withmeso-scale frontal waves between February and May from 1982 to 1988, their behavior and evolutioncharacteristics, the weather system model during clusters strong stage and the evolution patterns of cor-responding synoptic-scale cloud systems are given; finally, cluster movements are discussed.

The Condition of Occurrence and Development for the Sharp Heavy Rainstorm Cloud Cluster Happened on 16th August;

The paper analyses the development process and internal construction of a pulse strom taken place about 12 o clock on June 19,2004 in the boundary of Penglai county and Longkou country by using Doppler radar products.