Pacific Warming Raises Global Concern
Scientists have been monitoring the tropical Pacific Ocean for months as signs point to the development of an unusually powerful El Niño. Forecasts now suggest the event could rapidly intensify in the coming months and reach peak strength between late fall and early winter.
A Rare Super El Niño Scenario
The event is already being described informally as a Super El Niño, a category reached by only a small number of episodes in recent decades. The most recent event of comparable intensity occurred in 2015 to 2016, but some computer models now indicate that the current El Niño could exceed every recorded event since at least 1950.
Forecasts Approach Unprecedented Levels
Michael Tippett, an atmospheric scientist at Columbia University, said the latest projections are striking. “I think it’s fair to say that, depending on [the] model, the forecasts are close to unprecedented,” he said in an email.
How El Niño Changes Weather Patterns
El Niño is a recurring climate pattern marked by warmer-than-normal ocean temperatures in the equatorial tropical Pacific. These changes alter atmospheric circulation in the region and can reshape weather conditions around the world.
Heat Transfer Can Intensify Extremes
During El Niño, large amounts of heat move from the ocean into the atmosphere. This can lift global average temperatures and increase the risk of extreme weather, including floods in some areas, drought in others, heat waves and other damaging events.
A Stronger Signal in Recent Models
Recent computer model runs have shifted toward a more intense peak than earlier forecasts. Climate scientist Zeke Hausfather said: “The consensus is definitely shifting towards an even stronger event.”
He added: “The model runs have been consistently showing higher probabilities for a very strong event compared to a few months ago, and every month sees higher estimates.” He also said: “Currently, the odds of seeing a record-strong El Niño event this year are quite large.”
Ocean Temperatures Reinforce the Forecast
Although model projections do not guarantee the final strength of El Niño, current ocean conditions support the concern. Over the past month, waters in the main El Niño monitoring region have been record warm for this time of year, as hot water shifts from the western Pacific toward the east.
Climate Change Adds Uncertainty
A major unknown is how a much warmer planet will interact with an El Niño of this possible intensity. Global sea surface temperatures are at record highs, and worldwide air temperatures are on track for another year among the five warmest ever recorded.
Impacts May Differ From Past Events
Because the planet is already warmer due to human-caused climate change, some traditional El Niño impacts could behave differently. The 2023 to 2024 El Niño did not produce all of the typical weather pattern shifts known as teleconnections, although no two El Niño events unfold in exactly the same way.
Stronger Events Have Wider Reach
The 2023 to 2024 event was not expected to be as intense as the current one. Stronger El Niño episodes are generally more likely to influence weather patterns across several continents, making the current forecast especially important for governments, emergency planners and agricultural markets.
Agriculture and Food Prices at Risk
El Niño can affect crop production in major food producing regions. In previous events, it has reduced rice yields in India and other parts of Asia, which can contribute to food price inflation and increase pressure on vulnerable populations.
WMO Calls for Preparedness
The World Meteorological Organization, the United Nations weather agency, has urged officials worldwide to prepare for possible El Niño-related impacts. It is also working to mobilize UN agencies so they can anticipate extreme events that may require humanitarian response.
Rapid Intensification Expected
The WMO warned that El Niño is expected to strengthen quickly during the July to September period, bringing broad changes in global weather patterns. WMO Secretary-General Celeste Saulo said: “El Niño conditions are already underway and are forecast to strengthen rapidly into a strong event.”
She added: “This will intensify the risk of heatwaves on land and marine heatwaves in many regions of the world.”
Heat Risks Rise Through September
For July through September, the WMO issued temperature and precipitation outlooks that closely align with the typical effects of a strong El Niño. The agency also sees a strong likelihood of above-average global temperatures during that period, even though El Niño impacts often reach their peak during the Northern Hemisphere winter.
