1.With the numerical simulated data of the storm, the structure and evolution of the helicity, superhelicity and their dynamical influences on the development of the storm are investigated.

1.原有流单体在原地维持熟结构，表现出较强稳定性，而分裂出新单体在移动过程中，逐熟位相发展，并且又分裂出新单体。