What weather?

Weather refers to the specific state of the atmosphere near the surface in a short period of time.

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 temperature, pressure, humidity, wind, clouds, fog, rain, flash, snow, frost, thunder, hail, haze, etc.). ) in an instant.

The weather process is the change process of weather phenomena with time in a certain area. 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 and hemispheric 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.

The principle of weather forecast

Weather forecast is based on meteorological observation data, using the principles and methods of meteorology, dynamics and statistics to make a qualitative or quantitative forecast of the weather conditions in a certain area or a certain place in the future. Accurate weather forecast has always been an important goal of atmospheric science research.

The history of weather forecast can start with observing the weather with clouds and forecasting the weather with objects at the earliest, and then go through the stages of single station forecast and weather map forecast. Up to now, advanced detection data such as meteorological satellites and weather radars are used to forecast the weather with computers. With the continuous progress of science and technology, weather forecasting has developed rapidly.