El Niño

ENSO -> Seasonal Climate -> Impacts on Society

During El Niño conditions, the usually present east to west winds weaken and an anomalous west to east flow develops. The west to east flow drives warm equatorial waters from the western Pacific towards the eastern Pacific and northern South America.

Impacts of El Niño in the eastern equatorial Pacific include an increase in sea level heights, a decrease in cool water upwelling and an increase in sea surface temperature. The increase in sea surface temperature leads to increased convection and an increase in the risk for heavy precipitation in northwestern South America.

During El Niño, the following conditions are likely: