Convective cells formed at high altitude plots firstly and then spread to lower altitude area, and the speed and directions of cells 'spread depend on terrain factors and upper level wind.
对流单体主要在海拔较高的山脊处生成，并向低海拔地区移动传播，传播的速度和方向主要与地形和中高层风速风向有关。
Southwest wind enhancement, water vapour flux increase, ascending motion enhancement and water vapour convergence in upper level arouse the heavy snow process in central and east Yunnan.
高层西偏南风加强、水汽通量增大、上升运动的加强以及水汽的辐合造成滇中及以东的强降雪；
Southwest wind enhancement, water vapour flux increase, ascending motion enhancement and water vapour convergence in upper level arouse the heavy snow process in central and east Yunnan.
高层西偏南风加强、水汽通量增大、上升运动的加强以及水汽的辐合造成滇中及以东的强降雪；
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