The warmer water in the east further weakens the surface winds to the west. As these winds relax and less warm water is displaced to the west, the eastern ocean will get much warmer resulting in even weaker westward winds and an even warmer eastern ocean. Warm water then gets piled up in the east (areas like Peru) instead. Rainfall follows the warm water eastwards, bringing floods to the normally dry areas in Peru, and droughts in the normally wetter regions like Indonesia and Australia. This process is a classic hallmark of causes of El Nino. Read more about the effects of El-Nino.