The U.S. National Oceanic and Atmospheric Administration (NOAA) has signaled a high probability of an El Niño event developing this year, raising concerns about its wide-ranging impacts on the global economy and weather systems.
This forecast is the culmination of months of clear signals from the Pacific Ocean. The process began in late 2025, when a massive pool of warm water, known as subsurface heat content, started accumulating below the ocean's surface. This buildup, driven by oceanic phenomena called Kelvin waves, essentially "primed the system" for a warming event. Then, more recently, crucial shifts in wind patterns—specifically westerly wind anomalies—began to draw that deep, warm water up to the surface. This interaction between the ocean and atmosphere is a classic precursor to El Niño, giving forecasters the confidence to raise the probability to as high as 96% for the coming winter.
One of the most immediate and tangible effects is on global food markets. El Niño historically disrupts weather patterns that are critical for agriculture. For instance, it often brings drier-than-average conditions to South and Southeast Asia and parts of West Africa, which are vital growing regions. This directly threatens the yields of major crops like rice, palm oil, cocoa, and coffee. Anticipating these supply shocks, commodity markets have already started pricing in this risk. In the first half of May alone, futures contracts for rice and cocoa saw double-digit percentage increases. This adds significant upward pressure to global food inflation, which was already a concern for consumers and policymakers worldwide.
Beyond agriculture, El Niño significantly reshuffles storm risk across the globe. It typically increases wind shear—a disruptive change in wind speed or direction with altitude—over the tropical Atlantic. This atmospheric condition tends to tear apart developing hurricanes, leading to a suppressed, or less active, Atlantic hurricane season. While this may lower the risk for the Caribbean and the U.S. Gulf Coast, the atmospheric energy is often displaced, favoring more intense cyclone activity in the eastern and central Pacific Ocean. This shift has major implications for insurance and reinsurance markets, which must adjust their risk models accordingly.
Finally, this developing El Niño is occurring on top of an already unusually warm planet. Global sea surface temperatures in April were the second-highest on record for the month. Adding the powerful warming effect of an El Niño to this elevated baseline dramatically increases the chances that 2026 or 2027 could set a new record for the hottest year ever. While the exact strength of this El Niño remains uncertain, the convergence of oceanic data and model consensus points decisively toward a major climate event with far-reaching economic and environmental consequences.
- El Niño: A climate pattern characterized by the unusual warming of surface waters in the eastern tropical Pacific Ocean. It disrupts weather patterns worldwide, affecting rainfall, temperatures, and storm activity.
- Subsurface Heat Content: The amount of heat stored in the upper layers of the ocean, typically the top 300 meters. A buildup of this heat in the equatorial Pacific is a key precursor to an El Niño event.
- Wind Shear: A difference in wind speed and/or direction over a relatively short distance in the atmosphere. High vertical wind shear can prevent hurricanes from forming or cause them to weaken.