How does the weather forecast predict the weather?

Weather forecast 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 the collection of 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.

Cctv broadcasts short-term weather forecast every night 19: 30, and the time limit is 2-3 days in the future.

Extended data

The weather forecast of the ancients in China;

For thousands of years, sailors, fishermen, farmers and hunters have predicted the weather and explored the weather forecast by observing clouds, winds, sky and objects. Weather forecast has become a folk art. Ancient people looked at the sky and measured the wind and cloud. The former is the sky condition that can be observed by naked eyes and simple instruments. It not only observes the changes of the sun, moon and stars, but also records all kinds of natural phenomena in the past and present, and combines the summarized experience with the present observation to make weather forecast.

Reference Weather Forecast-Baidu Encyclopedia