Weather forecast content

Weather forecast (measurement) or meteorological forecast (measurement) is to use modern science and technology to predict the state of the earth's atmosphere in a certain place in the future. Since prehistoric times, human beings have begun to predict the weather and arrange their work and life accordingly (such as agricultural production and military operations). ).

Today's weather forecast mainly uses collecting a large number of data (temperature, humidity, wind direction and speed, air pressure, etc.). ), and then use the current understanding of atmospheric processes (meteorology) to determine future air changes. Because of the chaos of the atmospheric process and the fact that science has not fully understood the atmospheric process today, there will always be some errors in the weather forecast.

The satellite cloud image of China Central Meteorological Observatory was taken from Fengyun-1 and other meteorological satellites. Using satellite cloud images for analysis can improve the accuracy of weather forecast. Weather forecast is usually divided into three types: short-term weather forecast (2 ~ 3 days), medium-term weather forecast (4 ~ 9 days) and long-term weather forecast (10 ~ 15 days or more). CCTV mainly broadcasts short-term weather forecast every day.

Extended data

Since ancient times, intellectuals in China have been concerned about the prediction of astronomy, earthquakes and meteorology. Dong Zhongshu, an ancient thinker, put forward the slogan of "bending people and extending the monarch, bending the monarch and extending the sky". The first sentence is to ask the subjects to obey the emperor. The last sentence is to ask the emperor to listen to God's will. God limited the emperor's actions. Most of these phenomena come from ignorance of the sky (such as solar eclipse) and the earth (such as earthquake), and the unpredictability of extreme weather and abnormal climate, such as lightning, drought, flood, fire and locust plague.

Ignorance of natural disasters has opened the door for people to express their opinions. In the early days, astronomy and meteorology were inseparable. Astronomy and meteorology should be observed and predicted. Three thousand years ago, there were records about weather in Oracle Bone Inscriptions, China, including wind, clouds, rainbow, rain, snow, frost, haze, tornado, thunderstorm and so on. Because a large number of weather events were recorded in writing, some intellectuals finally got to know the climate.

In ancient China, the most explicit purpose of observing astronomy and meteorology, making calendars, understanding and predicting climate was to arrange agricultural production, offering sacrifices and other activities. Oracle Bone Inscriptions also reflected that tourists had already met the requirements of forecasting weather conditions, which met the needs of agricultural production at that time. As early as the Spring and Autumn Period, the ancients set four solar terms: midsummer, midsummer, midsummer and winter solstice. After continuous improvement and perfection, by the Qin and Han Dynasties, the 24 solar terms had been completely established.