The wind blows strongly from the east to the west. This piles up the water in the west. In a El Nino winds in it get weaker as it pushes the water around. Some of the warm water that is piled up in the west slides back to the east. Not much cold water get pulled up from under the warm water.
This usually happens around Christmas time in South America so they called it El Nino. This means the infant or the Christ child because it happens around Christmas.
A strong El Nino often is associated with wet winters all over the southeastern U.S. and drought in the Indonesia and Australia.
El Nino may have caused the 1993 Mississippi and 1995 California floods. They also believe that it also caused the lack of serious storms like hurricanes in the north Atlantic which spreads over to Florida.
The equator has some of the worlds warmest oceans. Most horrible El Nino’s of the century is in the winter of 1982 and 1983 the total was $8 billion in damage.
The El Nino happens about every three to seven years. It is often the most windy time of the year around the pacific ocean. They use satellites to watch El Nino grow and move. They also use these things like bobbies that they put in the sea to watch El Nino, so they can see if its dangerous to us.