Rain in some parts of central and southern China has hit record highs in recent weeks even though overall precipitation is about 10 percent lower this year compared with last year, according to the Ministry of Water Resources.
Water levels on the Yangtze and its tributaries were expected to rise further over the next week, the ministry said, and it warned of major floods throughout the country from June to August.
Some monitoring stations are issuing alerts, with the Wuhan city section of the Yangtze river in central China more than two yards higher than the normal at this time of the year as a result of heavy rain upstream.
Last summer, rainfall reached its second highest level since 1961, triggering flood alerts on major rivers and lakes and bringing water levels at the giant Three Gorges Dam close to their maximum.
For the whole of last year, nationwide precipitation levels stood at nearly 700 millimeters (27 inches), 10.3 percent higher than average and up 7.6 percent from a year earlier, with rainfall doubling in some parts of central and northeast China.
On Sunday, an unexpected onslaught of hail, freezing rain, and gales killed 21 runners during an ultramarathon race in the northwestern province of Gansu.
This month, a tornado hit Wuhan and another hit the eastern coastal province of Jiangsu, killing 12 people and injuring hundreds.
By David Stanway