The results also show that the centre of the heavy snow lay in the positive area to the western severe gradient of MPV 1 zero line and also in the negative area to the northern severe gradient of MPV 2 zero line.

• 大降雪中心位于MPV1 零线西侧强梯度带的正值区内 ,它也位于 MPV2 零线北侧强梯度带的负值区内。 冬季在对流稳定层结下 ,当 MPV2 值为负时 ,垂直涡度才能得到较大的增长 ,导致上升运动 ,产生大降雪天气