Yangtze River Basin Braces for Flooding as Heavy Rains Persist
Persistent heavy rainfall across the Yangtze River basin has placed multiple Chinese provinces on high alert, with authorities maintaining emergency flood-control responses as water levels continue to rise. The National Flood Control and Drought Relief Headquarters has kept a Level-IV flood-control emergency response active for eight provincial-level regions — Jiangsu, Anhui, Jiangxi, Hubei, Hunan, Guangxi, Chongqing, and Guizhou — according to the Ministry of Emergency Management.
Severe Rainfall and Widespread Impact
On June 22-23, areas including southern Guizhou, eastern Hubei, northern Hunan, northern Jiangxi, southern Anhui, southern Jiangsu, Shanghai, and parts of Zhejiang reported heavy to torrential rain. A local area in Qiannan, Guizhou recorded extremely heavy rainfall exceeding 250 millimeters in 24 hours, as reported by Xinhua News. The Central Meteorological Observatory has maintained a yellow alert for rainstorms, warning of severe convective weather with localized hourly rainfall potentially exceeding 90 millimeters.
Ma Xuekuan, Chief Forecaster at the Central Meteorological Observatory, explained the meteorological mechanism driving the sustained downpours. “This round of heavy rainfall in the south is mainly driven by the Jianghuai shear line,” Ma told China News Service. “Southward-moving cold air meets warm and moist air currents in the Jianghuai basin, forming a shear line that remains stable, producing sustained heavy rainfall.”
First Numbered Flood of 2026
The Liujiang River in the Pearl River basin has experienced the first numbered flood of 2026 for China’s major rivers, the State Council Information Office confirmed. This designation — officially “2026 Main River No. 1 Flood” — marks a significant milestone in what has already been an exceptionally active flood season.
Infrastructure Preparedness at Scale
In a major preventive measure, the world’s largest clean energy corridor — six cascade hydropower stations along the Yangtze River — has completed its annual pre-flood water level drawdown, freeing up a total flood storage capacity of 35.8 billion cubic meters. According to CCTV News, the six stations — Wudongde, Baihetan, Xiluodu, Xiangjiaba, Three Gorges, and Gezhouba — completed the drawdown ahead of schedule, with the Three Gorges reservoir level reduced to 147.78 meters by June 7.
An Early and Severe Flood Season
China entered its 2026 flood season on March 15 — 17 days earlier than the multi-year average of April 1. The early onset has been attributed to El Niño conditions, which typically enhance the subtropical high pressure system and increase moisture transport to the Yangtze basin, prolonging and intensifying the annual plum rain (meiyu) season.
The numbers underscore the severity: since the start of the flood season, 104 national meteorological stations broke May single-day rainfall records, and 121 stations broke monthly rainfall extremes. May 2026 recorded the highest national average precipitation (70.9 millimeters) for the same period in the last decade, according to data from the National Climate Center cited by China Daily.
High-Risk Areas and Forecast
Northern Guangxi, southern Guizhou, and western Hunan are expected to see the highest cumulative rainfall. The Ministry of Emergency Management has warned that the risk of mountain torrents, geological disasters, urban waterlogging, and flooding of medium and small rivers remains high in these areas. From June 21-26, heavy to torrential rain is forecast across southwestern and southern China, including regions between the Yangtze and Huai rivers, the Jianghan Plain, and areas south of the Yangtze River. After June 24, the rain belt is expected to shift southward with weakening intensity.
Authorities have been urged to strengthen monitoring and forecasting, activate emergency responses in a timely manner, and prioritize the evacuation of people in high-risk areas. The MEM joint consultation statement emphasized the need for “decisive measures such as closures and controls as circumstances warrant.”
Broader Weather Contrast
While the Yangtze basin experiences cooler temperatures (around 25°C in major cities like Wuhan, Nanjing, and Shanghai) due to persistent rain and cloud cover, southern Jiangnan and South China are simultaneously enduring a heatwave with high humidity — described locally as “sauna weather” — with nighttime lows remaining around 26°C.
What to Watch For
As the 2026 flood season continues through August, the performance of the Three Gorges Dam and other cascade hydropower stations under sustained high inflows will be closely monitored. The 35.8 billion cubic meters of reserved flood storage capacity represents a massive engineering buffer, but the prolonged nature of this year’s rainfall — driven by the ongoing El Niño event — will test even the most robust infrastructure. Agricultural regions in Hunan, Jiangxi, and Anhui, which form China’s rice-growing heartland, face particular risk from sustained inundation.
The coming days will determine whether the forecast southward shift of the rain belt materializes as expected, or whether stalled weather patterns could bring even more severe flooding to the Yangtze basin.