The squall line is a kind of instable and strong convective weather caused by the air with upper-layer dry and lower-layer wet in front of the upper-troposphere trough.
分析指出，该飑线系统是由高空槽前型的上干下湿引起的不稳定强对流天气。
The major systems come from the shear line of low-layer, the low trough of upper air and the ground stationary front.
主要影响系统来自低层切变线、高空低槽和地面静止锋；
Through the analysis, it is shown that the Matsa s extratropical transition and the re-intensification are due to the intrusion of cold air from the upper-level trough into the typhoons circulation.
以一个在陆上长久维持并最终演变成温带气旋的登陆台风“麦莎”为研究对象，通过对其北上变性过程的分析发现，台风与中高纬西风槽的相互作用使得冷空气侵入是其变性加强的原因。
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