The powerful El Nino developing in the Pacific Ocean could have another major climate phase waiting after it begins to weaken. While the phenomenon is expected to remain strong through early 2027, scientists are monitoring whether the ocean will eventually transition towards La Nina, its opposite phase, bringing another shift in global weather patterns.
The ongoing El Nino has intensified significantly, with the US National Oceanic and Atmospheric Administration (NOAA) forecasting strong-to-very-strong conditions through January-March 2027. Its effects could extend beyond the period of peak warming, influencing temperatures and rainfall across several parts of the world.
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However, the transition from El Nino to La Nina is not necessarily immediate. The Pacific Ocean can first return to ENSO-neutral conditions, in which neither warming nor cooling dominates.
Will La Nina Follow El Nino In 2027?
According to NOAA's October 2026 ENSO forecast, El Nino is expected to remain dominant through the first few months of 2027. The probability of La Nina remains negligible through March-May 2027, while the likelihood of neutral conditions begins increasing during April-June.
For May-July 2027, NOAA estimates a 13 per cent probability of La Nina, compared with a 70 per cent probability of ENSO-neutral conditions. This suggests that the Pacific Ocean could gradually move away from the ongoing warming phase, although a La Nina event is not yet the most likely outcome.
The International Research Institute for Climate and Society (IRI) at Columbia University anticipates that the powerful El Nino will lose intensity over time. Its forecast released on October 19 suggests that ENSO-neutral is likely to be the most common likely in June-August 2027.
What Happens When El Nino Changes Into La Nina?
El Nino and La Nina are two different phases of the same climate pattern known as the El Nino-Southern Oscillation (ENSO), which forms in the tropical Pacific Ocean.
In an El Nino the surface waters of the central and eastern equatorial Pacific are warmer than normal. The trade winds that normally blow from east to west weaken, letting the warm water drift eastward.
La Nina creates nearly opposite ocean conditions. Weaker than normal trade winds push warm surface water away from the western Pacific and towards the coast of Australia and Asia. Cold water upwells along the coast of South America.
In the Shifters, the changes ripple through the atmosphere, dictating rainfall, temperatures and the movement of storms across the various continents.
How Could La Nina Affect India's Weather?
This change from El Nino to La nina is especially significant for India as the two phases bring contrasting monsoon behaviours.
El Nino is traditionally linked to below-normal southwest monsoon rains in India, which may result in drought-like conditions. Whereas La Nina is traditionally linked to above-normal monsoon rainfall in the country.
The climate trends are typical, not certain. For example, the distribution of rain over India also varies with the Indian Ocean Dipole and regional ocean temperatures and weather patterns.
If La Nina develops in 2027, meteorologists will closely monitor its possible influence on India's monsoon season. However, the current forecasts do not establish that a La Nina event will occur.
What Are El Nino And La Nina?
El Nino is Spanish for 'little boy', and La Nina means 'little girl'. The two are the extremes of ENSO.
El Nino is the warm phase, and La Nina is the cool phase. El Nino and La Nina have their origin in the tropical Pacific but can cause worldwide weather changes, like rainfall in India, drought in Africa and other temperature variations.
The phases don't necessarily alternate directly from one to the other. Neutral conditions can be found between them, and either phase can prevail for a while.
Since the present El Nino is set to stay strong into 2027, scientists will watch to see if Pacific Ocean temperatures indicate the next change will be neutral or a La Nina.
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