Why is the weather abnormal?

The ever-changing atmospheric state is not only the atmospheric state in a certain time and space, but also the continuous change of atmospheric state in a certain time interval. So it can be understood as a general term for weather phenomena and weather processes. Weather phenomenon refers to

Various natural phenomena in the atmosphere, that is, the comprehensive expression of the spatial distribution of various meteorological elements in the atmosphere (such as wind, clouds, fog, rain, snow, frost, thunder, hail, etc.). ) in an instant. The weather process is that the weather phenomenon in a certain area has changed with time.

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Weather is the general name of atmospheric conditions (such as cold and warm, wind and rain, dry and wet, sunny and so on). ) and its changes in a short time in a certain area. Weather system usually refers to high pressure, low pressure, high pressure ridge and low pressure trough that cause weather change and distribution.

Characteristic atmospheric motion system. All kinds of weather systems have certain time and space scales, and they are intertwined and influence each other. The combination of many weather systems constitutes a large-scale weather situation, forming a hemisphere and even

Global atmospheric circulation.

The weather system is always in the process of rebirth, development and extinction, and there are corresponding weather phenomena in different development stages. Therefore, the weather and weather changes in a region are synchronized with the weather system and its development stage.

What is relevant is the comprehensive result of the dynamic process and thermal process of the atmosphere.

All kinds of weather systems are formed, developed and evolved in a certain atmospheric circulation and geographical environment, and all reflect the environmental characteristics of a certain region. Such as the polar regions and their surrounding areas

Covered with ice and snow all the year round, the air is cold and dry. This unique geographical environment has become the background condition for the formation and development of polar low-altitude cold high pressure and high-altitude polar vortex trough. The equator and low latitudes are hot and humid all the year round, and the atmosphere is unstable.

It is a necessary condition for the emergence and development of convective weather system. Mid-high latitudes are areas where cold and warm air currents often cross. Cold and warm air masses not only come and go frequently, but also their baroclinic instability, which is of great significance to the formation and development of frontal and cyclone systems.

Foundation. The formation and activities of weather system will in turn have a profound impact on the structure and evolution of geographical environment. Therefore, it is very important to understand and master the formation, structure, movement and variation of weather system and its relationship with geographical environment.

The formation, characterization, change and prediction of geographical environment are very important.