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What is the reason for the recent heavy rain disaster in South China?

There are two main reasons:

1, June and July were originally the rainy season in southern China, with a lot of precipitation and frequent floods in previous years.

2. In recent years, El Nino has occurred frequently, which is also one of the driving forces of this rainstorm.

El Nino (Spanish: El Nino? O), also known as El Nino phenomenon, is called ENSO together with another phenomenon, Southern Oscillation. This is a term used by fishermen in Peru and Ecuador to refer to abnormal climate phenomena. It mainly refers to the abnormal continuous warming of seawater temperature in the tropical ocean in the eastern and central Pacific Ocean, which changes the global climate pattern, causing drought in some areas and excessive rainfall in some areas.