The Rising Threat of a ‘Super’ El Niño: Could the Hidden Ocean Phenomenon Rewrite Weather?

For centuries, the vast Pacific Ocean has appreared calm, endless, and predictable. However, beneath its tranquil blue waters lies one of Earth’s greatest climate secrets – the rising threat of a ‘super’ El Niño. The extraordinary force, which is capable of reshaping weather patterns across continents, is evolving at a time the world is grappling with record-breaking heat, food insecurity, geopolitical instability, and disruptions to global trade, including in the Strait of Hormuz.

What has captured global attention is not simply the return of El Niño, but the rising threat of a ‘super’ El Niño with the increasing possibility that it could intensify into one of the strongest events recorded in recent decades. The result can be devastating: scorching heatwaves, catastrophic floods, prolonged droughts, destructive wildfires, crop failures, and growing threats to water and food security, affecting millions of lives worldwide.

Why Scientists Are Worried about the Rising Threat of a ‘Super’ El Niño – A Giant Climate Engine Beneath Waves

Invisible to the naked eye, El Niño is one of nature’s most powerful climate drivers. A slight rise in sea surface temperatures across the tropical Pacific can send ripples through the atmospheres. Scientists are particularly worried about the rising threat of a ‘super’ El Niño, because there is growing possibility that it could evolve into a very strong El Niño in the winter months. If that happens, its peak during the Northern Hemisphere winter could amplify weather extremes already intensified by human-caused climate change, making the months ahead more volatile, unpredictable, and potentially more destructive than ever before.

El Niño begins in the tropical Pacific Ocean when sea surface temperatures remain unusually warm – at least 0.5°C (0.9°F) higher than normal – for several consecutive months. While the warming may appear small – sometimes only a couple of degrees – it is enough to alter atmospheric circulation on planet, like a stone dropped into a still lake, the effects spread outward in every direction.

Over the past three years, ocean temperatures outside the polar regions have remained 0.35–0.73°C above the long-term average, reflecting the growing impact of global warming. El Niño further intensified this trend, pushing June’s ocean temperatures to a new record high, according to the latest data from the Copernicus Climate Change Service (C3S) and the Copernicus Marine Environment Monitoring Service (CMEMS).

The World Meteorological Organization (WMO) has warned in its latest Global Seasonal Climate Update that El Niño is expected to develop rapidly into a strong event during the July–September period.

The WMO classifies El Niño episodes into four categories – weak, moderate, strong, and very strong. The current forecasts indicate that this event is likely to reach the strong category, the third-highest level of intensity.

According to the WMO, “El Niño conditions have developed in the tropical Pacific and are forecast to strengthen rapidly over coming months, increasing the likelihood of extreme weather events in many parts of the world.”

The rising threat of a ‘stronger’ El Niño raises the risk of heatwaves, droughts, floods, wildfires, and powerful storms across different regions of the world. Moreover, it reminds us that even a slight increase in ocean temperature can have profound consequences for Earth’s climate system.

The Rising Threat of a ‘Super’ El Niño Raises Global Heatwave Concerns as Oceans Continue to Warm

The World Meteorological Organization (WMO) has warned that a strengthening El Niño is likely to increase the risk of dangerous heatwaves, droughts, heavy rainfall, and other extreme weather events across many parts of the world.

According to the Geneva-based agency, forecasts from leading global climate centres show remarkable agreement that sea surface temperatures across the central and eastern equatorial Pacific will continue to rise. Seasonal average sea surface temperature anomalies are expected to exceed 2°C in key monitoring regions, providing scientists with high confidence that El Niño will strengthen further during the Northern Hemisphere autumn. At the same time, the equatorial Atlantic Ocean is also expected to remain warmer than average, adding more heat to an already warming climate system.

The previous El Niño played a major role in making 2023 the second-hottest year ever recorded, while 2024 became the hottest year on record, with global average temperature reaching about 1.55°C above the 1850–1900 pre-industrial average. Although El Niño typically reaches its peak between November and February, its strongest impact on global temperatures is felt several months later.

WMO Secretary-General Celeste Saulo said that El Niño conditions are already developing and are expected to strengthen rapidly into a powerful event. She warned that this will significantly increase the likelihood of prolonged droughts, intense rainfall, destructive floods, and both land and marine heatwaves in many regions.

To reduce the potential impacts of the rising threat of a ‘super’ El Niño, the WMO is strengthening its early warning systems, particularly for climate-sensitive sectors such as agriculture, food security, water resources, and public health. Accurate seasonal forecasts and timely warnings can help communities prepare in advance, save lives, and reduce economic losses.

Rising Temperatures Across Most of the Planet

The latest outlook suggests an overwhelming probability of above-average temperatures across nearly all populated land areas between 60° South and 60° North, leaving only the polar regions largely outside the forecast zone. Rainfall patterns are also expected to shift significantly.

Between July and September, parts of the southwestern United States are likely to receive above-normal rainfall, while the Indian subcontinent and much of Australia could experience below-average rainfall, increasing the risk of drought and water shortages, which may badly impact farming.

Climate Change Is Making El Niño More Dangerous

The WMO emphasizes that there is currently no clear evidence that climate change is increasing the frequency or intensity of El Niño events themselves. However, climate change is making their consequences far more severe. An increasing number of studies suggest that climate change may be altering the conditions under which these natural climate cycles develop. Although the science is still evolving, researchers are gaining a clearer understanding of how a warming planet could influence the behaviour of El Niño in the years ahead.

With the greenhouse gases continue to warm the atmosphere and oceans, more heat and moisture become available to fuel extreme weather. This means the rising threat of a ‘super’ El Niño now has a greater capacity to trigger record-breaking heatwaves, heavier downpours, more intense flooding, and prolonged droughts than it did in the past. During the Northern Hemisphere summer, the unusually warm Pacific waters associated with El Niño can also strengthen hurricanes in the central and eastern Pacific, while suppressing hurricane activity in the Atlantic Ocean by increasing vertical wind shear.

When El Niño Becomes a Global Climate Force

Unlike a typical El Niño, which temporarily disrupts global weather patterns, a Super El Niño has the potential to amplify climate extremes on a much larger scale. Its effects can spread across the continents, intensifying heatwaves, disrupting rainfall, reducing crop yields, worsening water shortages, increasing wildfire risks, and placing enormous pressure on ecosystems, biodiversity, public health, and national economies.

As the planet continues to warm, the rising threat of a ‘super’ El Niño serves as another reminder that natural climate cycles are becoming increasingly hazardous in a human-driven warming world. The combination of rising global temperatures and a strong El Niño creates conditions that can push weather extremes beyond historical limits, highlighting the urgent need for stronger climate resilience, better preparedness, and faster action to reduce the greenhouse gas emissions.

References:

• World Meteorological Organization (WMO)
• Copernicus Climate Change Service (C3S)
• Copernicus Marine Service (CMEMS)
• National Oceanic and Atmospheric Administration (NOAA)
• Intergovernmental Panel on Climate Change (IPCC)