In addition, a thought of how to use the mesoscale convergence center, TBB of convective cloud and the radar echo for rainfall rate to predict the mesoscale rain cluster is presented.

Study shows that the process is caused by cold vortex in the east of Mongolia and subtropical high, and mesoscale convective cloud cluster is the direct reason of the local severe heavy rainfall.

Hail clouds were classified 6 kinds according to scale: thunderstorm cloud, convective cloud, mesoscale convective system, cold-cloud-nuclei, cloud field of system clouds, and edge of cloud cluster.