What kind of weather system is the midsummer drought in the middle and lower reaches of the Yangtze River in China?

With the increase of temperature and the decrease of land pressure, the Pacific subtropical high (Hawaiian high) gradually moved westward, and the middle of July to mid-August was the normal year to control the middle and lower reaches of the Yangtze River. Under the control of high pressure (anticyclone), the descending airflow is very strong, so it is difficult to form precipitation. July and August are sunny, with high temperature and strong evaporation, resulting in summer drought. Therefore, the weather system formed by midsummer and summer drought in the middle and lower reaches of the Yangtze River is subtropical high (Hawaiian high) or anticyclone (high).

The typhoon landed at this time to alleviate the drought.