Using the analyses of weather process of an heavy rainfall system, it is found that there is a mesoscaledisturbance in the lower troposphere over Yangzi-Hwai valley.
通过一次江淮流域暴雨天气过程的分析，发现在对流层低层存在一种中间尺度扰动。
2
The second-order shear of the basic flow represents an instable factor for the symmetric disturbance, and drives the unstable mesoscaledisturbance to travel in the meridional direction;
基流二次切变对于中尺度对称扰动来说是一个不稳定因子，并且驱动不稳定的中尺度对称扰动在南北方向传播；
3
Five sorts of the vertical structure of wind disturbance fields are discussed. Among them, the effect of middle-low level wind disturbances is the strongest in the formation of mesoscale low.