Zhengzhou has no early warning weather.

This is not artificial snowfall. God often doesn't watch the weather forecast, that's all.

There is no difference between artificial snowfall and artificial rainfall. Some catalysts, such as silver iodide (which actually provides condensation nuclei), are shot into the clouds with guns or rockets. In fact, the effect is not very great so far, and sometimes it will have some effect, but no one can tell whether it is artificial rainfall or it is going to rain originally, or it will rain so heavily originally, because the weather forecast itself is impossible!