Currently, El Niño Southern Oscillation (ENSO), an irregularly periodic variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean, is in neutral condition. The warming phase of ENSO cycle is known as El Niño and its cooling phase as La Niña. It is characterised by the unusual cooling of the central and east-central equatorial Pacific Ocean.
During the past four weeks, equatorial sea surface temperatures were below average from the International Date Line to the eastern Pacific and were above average in the western Pacific. The International Date Line is an imaginary line on the Earth's surface, defining the boundary between one day and the next.
Both El Niño and La Niña are deviations from normal surface temperatures that occur due to the anomalous behaviour of trade winds. In the case of El Niño, the trade winds weaken, leading to warming.
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