The weather systems which cause the gales in the area are mainly cold wa- ve (cold front), lowpressurezone in Mongolia(northeast), cyclone, typhoon and rainstorm.
引起本区域大风的天气系统主要有寒潮（冷锋）、蒙古（东北）低压、气旋、台风及雷雨。
2
This zone has the features of poor property, poor communication and low energy, and pressure is not affected by water injection well.
其特点是物性差、连通性差、能量小和压力不受注水井影响。
3
The heavy fogs of Shangqiu are formed by the weather situations: continental anticyclone, warm zone in front of cold front, uniform pressure field, and low pressure with an inverted trough.