Inertial instability barotropic advection of potential vorticity the subsidence of the large value of potential vorticity above cyclone and geostrophic adjustment process is dynamical factors which make the cyclone developed violently 惯性不稳定,正压位涡平流以及正压位涡大值下沉至气旋上空和地转适应过程是气旋强烈发展的动力因子。