那曲强雷暴天气发生前，低空常出现强西南或东南风急流，且存在强水平风速垂直切变，两者可能是那曲雷暴天气频发的重要原因之一。
There often exist strong low-level southwest jet and wind vertical sheer before storm weather comes in Naqu area, and the two factors above may be important causes of local storm in rain season.
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.
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