Squally thunderstorms within a squall line. 颮線中的狂風雷暴。
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，該颮線系統是由高空槽前型的上干下濕引起的不穩定強對流天氣。
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