The gale was caused by the mesoscale system that the vorticity advection m upper, temperature advection in middle and lower layer, the explosively developing front cyclones.

• 高空涡度平流、中低空温度平流、南北两支气流相遇促使地面低压强烈发展生成新的锋面气旋是大风形成的中尺度系统；