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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