Why is the weather forecast completely inaccurate?

1, the complexity of atmospheric motion, chaotic motion, butterfly effect, and some motions are even unpredictable. Due to the complexity of atmospheric movement, the current forecast is about ten days at most, and it is only a situation forecast, not a specific weather phenomenon. . 2. The observed atmospheric information is not comprehensive. Some information about oceans, plateaus and desert areas is missing, although meteorological satellites provide a lot of information in this regard. 3. The computing power of computers used for numerical prediction and numerical simulation of atmospheric motion is still limited, although the fastest computers are first provided to meteorological services. 4. The existing meteorological science and technology development level is limited. The forecasting technology is limited and needs to be continuously developed. 5. Subjective factors: Forecasters' forecasting level is limited.