Why is there a summer drought in the middle and lower reaches of the Yangtze River in July and August? Isn't summer drought an anticyclone, that is, a high pressure center? But summer is not a sin.

The subtropical high in the northern hemisphere interrupted by the Asian depression only exists in South Asia-Southeast Asia, and on both sides of West Asia and East Asia.

During the northward movement of the North Pacific subtropical high, the northwest edge of the subtropical high collided with the temperate continental air mass, forming a rain belt. This rain belt usually lingers in the middle and lower reaches of the Yangtze River (south of the Qinling-Huaihe line) from the end of May to the beginning of July, and then jumps north to the north-northeast area. At this time, the middle and lower reaches of the Yangtze River are under the control of the subtropical high ridge in the North Pacific, and under its control, hot and sultry summer drought weather appears.