The Chinese dragon is as a symbol of auspicious power in Chinese folklore and art, it is the embodiment of the concept of yang [male] and associated with the weather and water as the bringer of rain.
Chinese dragons are believed to be the rulers of moving bodies of water, such as waterfalls, rivers, or seas. They can show themselves as water spouts (tornado or twister over water). There are four major dragons, one representing each sea. For instance the Dragon King of the Eastern Sea, Dragon King of the Western Sea, and so forth.
Because of this association, they are seen as "in charge" of water-related weather phenomenon. In premodern times, many Chinese villages (especially those living close to rivers) had temples dedicated to their local "dragon king." In times of drought or flooding, it was customary for the local gentry and government officials to lead the community in offering sacrifices and conducting other religious rites to appease the dragon, either to ask for rain or a cessation thereof.