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Weather forecast is a pre-estimation and prediction of future weather changes.

The phrase "the weather is unpredictable" fully illustrates the difficulty of weather forecasting. With the development of science and technology, the accuracy of weather forecast is constantly improving. According to the weather forecast, people can arrange production and life in time, so that meteorology can serve the national economic construction and reduce the loss of meteorological disasters.

Weather forecast is to analyze and predict the future weather in a certain area according to the basic theory and technology of atmospheric science, and it is an important means for atmospheric science to serve the national economic construction and people's life. Accurate and timely weather forecast is beneficial to economic construction and national defense construction. Protecting people's lives and property has great social and economic benefits. The time limit of weather forecast is divided into: short-term weather forecast 1-2 days, medium-term weather forecast 3- 15 days, long-term weather forecast month and season, short-term and near-term weather forecast 1-6 hours. At present, weather map is the main method of meteorology. Statistical forecast, using probability theory and mathematical statistics as means to make weather forecast. The above kinds sometimes cooperate with each other and are comprehensively applied, and computers are widely used as tools.