Fourthly, there is area of teeth of the gale on the intermediate layer of strong intensity echo location, height on 4-5km and definite velocity, presenting lower-level convergence and upper-level divergence above 10km.

• 在速度场上,在4-5km高度,和强度较强的回波相对应的位置,有逆风区,呈现辐合场,在10km以上高空呈辐散场的回波特征。