Was the natural cause of the 1998 floods the abnormal summer monsoon? Was it too strong or too weak?

Due to the strong summer monsoon

The summer monsoon will arrive in my country around March and April. Generally, if the summer monsoon is too weak, plum rain will form in the south of the Qinling Mountains in May. The strong summer monsoon will The precipitation in the north will increase, so our country is prone to drought in the south and floods in the north or floods in the south and drought in the north at this time. The floods in 1998 were mainly caused by heavy rainfall in June, July, especially August. Large-scale rainfall occurred in the Yangtze River and Heilongjiang basins, so it was caused by the strong summer monsoon. Moreover, satellites also showed that the El Niño phenomenon in the Pacific in the summer of 1998 caused the subtropical high pressure near the equator to rise, causing the floods in 1998. The principle is the same as the heavy rain caused by typhoons.

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