1998 the natural cause of flood disaster is abnormal summer monsoon, is it too strong or too weak?

The summer monsoon will arrive in China around March and April. Generally speaking, if the summer monsoon is too weak, plum rain will form in the south of Qinling Mountains in May, while if the summer monsoon is strong, the precipitation in the north will increase. So at this time, China is prone to drought in the south and waterlogging in the north or dry weather in the south. The flood in 1998 was mainly caused by the heavy precipitation in June and July, especially in August. There were large-scale precipitation in the Yangtze River and Heilongjiang River basins, so it was caused by the strong summer monsoon. Moreover, the satellite also shows that the El Ni? o phenomenon in the Pacific Ocean in the summer of 1998 led to the high subtropical high near the equator, which led to the flood in 1998. The principle is the same as a typhoon attack that brings heavy rain.

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