Why weather?
Weather
[weather]
The atmospheric conditions in a specific area within a relatively short period of time; the atmospheric conditions that are constantly changing, both at a certain time and The atmospheric state in space is also the continuous change of atmospheric state within a certain time interval. Therefore, it can be understood as a collective name for weather phenomena and weather processes. Weather phenomena refer to various natural phenomena that occur in the atmosphere, that is, the comprehensive expression of the spatial distribution of various meteorological elements (such as wind, clouds, fog, rain, snow, frost, thunder, hail, etc.) in the atmosphere at a certain instant. The weather process is the change process of weather phenomena in a certain area over time
Weather is a general term for the atmospheric state (such as cold and warm, wind and rain, dryness and humidity, cloudy and sunny, etc.) and its changes in a certain area within a short period of time. Weather systems usually refer to atmospheric motion systems with typical characteristics such as high pressure, low pressure, high pressure ridges, and low pressure troughs that cause weather changes and distribution. Various weather systems have certain spatial and temporal scales, and systems of various scales are intertwined and interact with each other. The combination of many weather systems forms a large-scale weather situation and constitutes hemispheric or even global atmospheric circulation.
Weather systems are always in the process of being reborn, developing and dying, and there are corresponding distributions of weather phenomena at different stages of development. Therefore, the weather and weather changes in a region are related to the weather system and its development stage, and are the comprehensive result of the dynamic and thermal processes of the atmosphere.
All kinds of weather systems are formed, developed and evolved in certain atmospheric circulation and geographical environments, and they all reflect the environmental characteristics of certain regions. For example, the polar region and its surroundings are covered with ice and snow all year round, and the air is cold and dry. This unique geographical environment has become the background condition for the formation and development of low-altitude cold high pressure in the polar region and high-altitude polar vortices and low troughs. The equatorial and low latitude areas are hot and humid all year round, and the atmosphere is in an unstable state, which is a necessary condition for the occurrence and development of convective weather systems. Mid-to-high latitudes are areas where cold and warm air currents often intersect. Not only do cold and warm air masses alternate frequently, but their baroclinic instability is also an important basis for the formation and development of fronts and cyclone systems. The formation and activities of weather systems will, in turn, have a profound impact on the structure and evolution of the geographical environment. Therefore, it is very important to understand and master the formation, structure, movement and change rules of the weather system and the relationship with the geographical environment to understand the formation, characteristics and changes of weather and climate and to predict the evolution of the geographical environment.