The geography book says that the summer rainstorm in northern China is a cold front, so what weather system caused the summer rainstorm in southern China? Thank you.

Summer rainstorm in southern China generally belongs to convective rain.

In summer, when the weather is hot, the air near the ground is heated or the upper air is strongly cooled, which leads to the rise of the lower air and the condensation of water vapor, forming convective rain. Before the arrival of convective rain, there are often strong winds, which can pull up trees with a diameter of 50 cm, accompanied by lightning and thunder, and sometimes hail. Convective rain is the most common in low latitudes, and the precipitation time is generally in the afternoon, especially in equatorial areas, and the precipitation time is very accurate. correct