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飑线是排列成带状的多个雷暴单体或雷暴群构成的风向、风速发生突然转变得十分狭窄的强对流天气带,是一种中小尺度天气系统。具有不同特征的两个气团相互碰撞是飑线产生的必要条件。最常见的情况是冷气团碰撞,但有时是干空气与湿空气碰撞。当干冷空气南下时,经过温度较高的地区,形成上干冷、下暖湿的热力结构,上下层热力分布差异,使得大气产生对流运动,加上一定的湿度条件,就容易出现对流性天气。
The 飑 line is arranged in a strip of thunderstorm monomer or thunderstorm group consisting of the wind direction, the wind speed suddenly changed very narrow strong convective weather zone, is a small and medium-scale weather system. Two air masses with different characteristics collide with each other, which is a necessary condition for the 飑 line. The most common situation is the collision of cold air mass, but sometimes the dry air collides with the humid air. When the dry cold air goes south, the heat structure that is dry, warm and wet is formed through the areas with high temperature. The difference in the heat distribution between the upper and lower layers makes the atmosphere produce convection movement. With some humidity conditions, it is easy to appear convective weather.