The El Niño climate pattern is making a return, and there are growing concerns it could become one of the most powerful events ever recorded. The resulting extreme weather threatens not only global food production and energy supplies but also carries the potential to fuel inflation and dampen worldwide economic growth.
El Niño is a cyclical climate phenomenon that begins with a warming of sea surface temperatures in the equatorial Pacific Ocean, triggering a cascade of changes that reshape weather patterns around the globe. Some regions may experience intensified heatwaves and drought, while others face increased rainfall and flooding. The resulting disruptions to crop markets and energy infrastructure could push prices higher and act as a drag on economic activity.
The U.S. Climate Prediction Center confirmed the arrival of El Niño conditions in June, and by August, it indicated a 69% probability that current conditions would reach the most severe levels recorded since 1950 by the end of the year. This forecast has reinforced the belief among many observers that the ongoing event could evolve into a "super El Niño."
Understanding the basics of El Niño
The phenomenon was first documented by Peruvian fishermen in the 17th century, who noticed that Pacific waters became unusually warm around Christmas time in certain years. They named the occurrence "El Niño de Navidad" in honor of the Christ child. During an El Niño event, the trade winds that normally blow from east to west, pushing warm Pacific waters toward Asia, weaken and can even reverse direction. While the precise trigger remains unclear, the consequence is that warm water drifts back toward the Americas, leading to a significant warming of a vast expanse of the central and eastern Pacific Ocean. This additional heat alters the atmospheric conditions above the sea surface, ultimately shifting storm tracks and rainfall patterns.
Frequency of occurrence
El Niño events do not follow a fixed schedule, typically appearing every two to seven years, with varying intensity and duration. The most recent event concluded in 2023-2024. El Niño is part of a larger Pacific climate cycle known as the El Niño-Southern Oscillation (ENSO), which oscillates between El Niño, its cooler counterpart La Niña, and a neutral phase. During La Niña, trade winds strengthen, pushing warm water further west and causing cooler-than-normal sea surface temperatures in the eastern Pacific. The Pacific Ocean covers roughly one-third of the Earth's surface, giving ENSO an exceptionally broad global influence. While similar climate patterns exist in the Atlantic and Indian Oceans, their reach is far more limited. El Niño and La Niña events typically peak between December and January, though their impacts can persist for several months.
Defining a "super El Niño"
El Niño conditions are typically identified by monitoring Pacific sea surface temperatures, most commonly in a region known as Niño 3.4. According to the U.S. National Oceanic and Atmospheric Administration (NOAA), an El Niño is declared when sea surface temperatures in that area exceed the long-term average by at least 0.5 degrees Celsius (0.9 degrees Fahrenheit) for five consecutive overlapping three-month periods. A temperature anomaly of at least 1.5 degrees Celsius indicates a strong El Niño, while a 2-degree Celsius anomaly constitutes a very strong one. The term "super El Niño" is not an official classification used by NOAA or the World Meteorological Organization. Instead, it has gained popularity this year as market expectations have grown for a potentially very strong El Niño event. Very strong El Niños are rare; only a handful have occurred since 1950, with the last one taking place in 2015-2016. While a strong El Niño increases the probability of extreme weather events, it does not guarantee severe impacts.
Global weather impacts
El Niño gradually releases the heat stored in the Pacific Ocean into the atmosphere, often driving global temperatures to record highs. NOAA scientists project that 2027 could become one of the hottest years on record, potentially surpassing 2024, when global temperatures were 1.5 degrees Celsius above the pre-industrial average. The impacts of El Niño vary significantly by region. Effects typically appear first in the tropics and then spread to Australia, Asia, the Americas, and Africa. Australia, Southeast Asia, the northern United States, and Canada typically experience hotter and drier conditions, increasing the risk of droughts and wildfires. India may see anomalous monsoon rainfall. Conversely, the southern U.S., Chile, Argentina, and parts of East Africa often become wetter, with an elevated risk of flooding.
During El Niño years, the Atlantic hurricane season is usually calmer, as increased wind shear—sudden changes in wind speed or direction—can disrupt developing storms. While any hurricanes that do form can still be highly destructive, the reduced number helps lower the risk to communities, infrastructure, and oil and gas facilities in the Gulf of Mexico. On average, the Atlantic sees about 14 named storms between June and November, with storms receiving official names once winds reach 39 miles per hour (63 kilometers per hour). NOAA anticipates only 7 to 13 named storms this season, partly due to El Niño's influence. In contrast, typhoon activity in the Pacific typically increases during El Niño. Warmer ocean waters provide additional energy for tropical storms, meaning Asia may face a higher risk of typhoon-related disasters.
Why these shifts matter
El Niño is one of the most closely watched climate signals globally because it provides clues months in advance about potential storms, drought risks, crop yields, and energy demand. Utility companies use ENSO forecasts to anticipate heating and cooling needs. Higher temperatures can drive up electricity consumption for air conditioning, straining power grids and potentially leading to blackouts. Reduced rainfall can also lower hydroelectric generation capacity. Commodity traders closely monitor risks to crops, mining operations, oil and gas production, and shipping routes. Drought can lower water levels in the Panama Canal, which connects the Atlantic and Pacific Oceans, slowing traffic through one of the world's busiest shipping bottlenecks. In 2023, vessels ran aground on the banks of the Negro River due to low water levels.
El Niño has both positive and negative effects, but historical evidence suggests that its global economic costs typically outweigh regional benefits. Researchers at Dartmouth College, analyzing the five-year economic aftermath of El Niño events, estimated that the 1997-1998 El Niño led to cumulative global GDP losses of approximately $5.7 trillion.
Impact on food production
Some crops can benefit from El Niño. For example, increased rainfall in California is favorable for avocado and almond production. However, many essential agricultural products such as rice, wheat, palm oil, coffee, and sugar are primarily grown in regions that may face hotter and drier conditions. Beyond impacts on land-based agriculture, El Niño also disrupts marine fisheries. The eastward flow of warm water suppresses the upwelling of cold, nutrient-rich water from the deep ocean, reducing the abundance of marine plankton, which serves as the base of the fish food chain. Some fish species, such as anchovies off the coast of Peru, may migrate to cooler, deeper waters, making them harder to catch, while certain tropical fish may move into areas that were previously too cold. Reduced crop yields, lower fish catches, and livestock deaths from extreme weather can all threaten global food security and push up food prices.