An Analysis of Extremely Strong Rainstorm Occurred by the Tropical Cloud Cluster in Eastern Zhejiang

In this paper an extremely strong rainstorm process on 29—30 July 1988 in eastern Zhejiang is analysed. The maximum precipitation is 533 mm. It was occurred by the mesoscale convection cloud cluster, which was developed by the interactions between the easterly disturbances in the two sides of subtropical high in the lower troposphere, and between the easterly disturbances in the lower and higher troposphere. The cloud cluster was maintained by the interaction between the cold air caused by the convection precipitation and the tropical easterly system