What is the meteorological department?

Weather system is an atmospheric movement system with certain spatial structure characteristics of meteorological elements such as temperature, pressure or wind. If there is, it shows the distribution of air pressure in space, which is composed of high pressure, low pressure, high pressure ridge and low pressure trough. Others are classified according to the distribution characteristics of wind, such as cyclone, anticyclone and shear line. Some are determined by the characteristics of temperature distribution, such as the front. Others are classified according to certain weather characteristics, such as thunderstorms and tropical clouds. Usually, there is a certain configuration relationship between air pressure, wind, temperature and meteorological elements that constitute a weather system. The spatial range of various weather systems in the atmosphere is different, and the horizontal scale can range from several kilometers to 1-2000 kilometers. Its life history is also different, ranging from hours to days.

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 have a certain spatial scope and a certain process of rebirth, change and extinction. Different stages of the development of various weather systems have their corresponding weather phenomena distribution. In the weather forecast, we can roughly predict the future weather changes through various systematic forecasts. The combination of many weather systems constitutes a large-scale weather situation and hemispheric and even global atmospheric circulation.

According to the spatial distribution of meteorological elements, the atmospheric motion system with typical characteristics (usually refers to the system composed of the spatial distribution of atmospheric pressure), such as high (gas) pressure, low (gas) pressure, high pressure ridge, low pressure trough, etc. Sometimes it refers to the wind distribution system, such as cyclone circulation, anticyclone circulation, shear line and so on. Sometimes it also refers to the system of temperature distribution, such as high temperature zone, low temperature zone, front zone and so on. Sometimes it refers to the distribution system of weather phenomena, such as thunderstorms and tropical clouds. There is often a certain configuration relationship between this element system and another element system. The relationship between pressure system and wind field is good: low pressure and cyclone circulation are matched, sometimes called low pressure and sometimes called cyclone; The configuration of high pressure and anticyclone is sometimes called high pressure and sometimes anticyclone. Air pressure system and temperature system often have a certain configuration relationship. For example, the configuration of low pressure and low temperature zone is called cold low pressure or cold vortex; The configuration of low pressure and high temperature zone is called thermal low pressure. The atmospheric pressure system can also have a certain configuration relationship with weather phenomena, such as thunderstorm and (small) high pressure configuration, which is called thunderstorm high pressure. The weather system can be analyzed by various weather maps and satellite cloud images.

All kinds of weather systems have a certain spatial scope and a certain process of rebirth, change and extinction. Different stages of the development of various weather systems have their corresponding weather phenomena distribution. In the weather forecast, we can roughly predict the future weather changes through various systematic forecasts. The combination of many weather systems constitutes a large-scale weather situation and hemispheric and even global atmospheric circulation.