Why is there unpredictable weather?

The weather change in a place is caused by moving large and small systems (high pressure, low pressure, etc.). ), they are called weather systems. Meteorological satellite observation data show that in the process of atmospheric movement, large and small weather systems are intertwined, interactive and constantly evolving. The largest weather system can reach more than 2000 km, and the smallest is less than 1 km. The larger the system scale, the longer the life history; The smaller the system scale, the shorter the life course, and the smaller system is often formed and developed under the gestation of the larger system. After the smaller system develops and grows, it will react to the larger system, which is interrelated, restricted and complicated.

All kinds of weather systems are formed, developed and evolved in a certain geographical environment, and all have the characteristics of a certain geographical environment. For example, polar regions and high latitudes are cold and dry all year round. This environmental feature has become a necessary condition for the formation and development of high-altitude polar vortex, low trough and low-altitude cold and high-pressure system in polar regions and high latitudes. The equatorial and low latitudes are hot and humid all the year round, and the atmosphere is unstable, which is an important basis for the formation and development of convective weather systems. Mid-latitude is located at the intersection of cold and warm air, where not only cold and warm air masses alternate frequently, but also fronts and cyclone systems are formed and developed. The formation and activities of weather system will in turn affect the geographical environment. Therefore, it is of great significance to understand and master the structure, composition, movement and change of weather system and its relationship with geographical environment for understanding the formation and change of climate and predicting the evolution of geographical environment.