低层低空急流脉动产生的强辐合，高空急流诱发的高层强辐散是本次东北地区暴雨天气的直接触发机制。
Severe convergence brought by Low-level jet pulsation, and severe divergence brought by upper-level jet is directly trigger mechanism of this intense rainstorm.
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.
高空急流轴倾斜以及急流出口区右侧强辐散场的出现要早于暴雨的发生。
The incline jet axis and strengthened convergence happen earlier than the rainfall does.
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