What principle does the meteorological station use to forecast the weather, and why is the accuracy of the forecast so low?

The principle of 1. is a set of equations composed of five equations, which is called the original equation. Essentially, the principles are Newton's second law and thermodynamic law. You can study dynamic meteorology if you are interested.

2. The low accuracy is mainly due to the fact that the current meteorological monitoring network in China is not very developed, especially the site density in plateau areas needs to be improved. In addition, China has a vast territory and complex terrain, and the Qinghai-Tibet Plateau is the main meteorological problem.

3. Meteorological work has evaluation criteria and scoring mechanism. If the report is not good, there are corresponding rectification measures, and there are different regulations in different places.

At present, the accuracy rate can reach over 90% in three days and over 95% in 24 hours. Of course, if you are in a mountainous area, your personal feelings may be different.