Yunnan-Guizhou drought, why not use artificial rainfall to solve it, heavy snow in the northeast, and great weather changes?

This has something to do with geography. The precipitation in Yunnan-Guizhou region mainly comes from the Indian Ocean, not the Pacific Ocean. The air mass in the Indian Ocean generally reaches Yunnan and Guizhou from the southwest monsoon in March and April, forming rainfall. Because Yunnan-Guizhou region is the Yunnan-Guizhou Plateau, it is less affected by the cold front from the north, which is also the reason why the seasons here are like spring. The Indian Ocean warm front stays in Yunnan and Guizhou for a month or two, so it is rainy in April and May in Yunnan and Guizhou. If the southwest monsoon is weak in a certain year, the moist warm air mass in the Indian Ocean will not pass, the rainfall will be greatly reduced, and artificial rainfall will be lacking. The heavy snow in the northeast is very simple because of the cold air mass from Siberia. When cold and warm air masses meet, precipitation will be formed (precipitation includes rainfall, snowfall, hail, etc.).