When forecasters predict a slow hurricane season, a certain silence descends upon coastal towns. People can breathe more easily. The plywood is kept in the garage. And somewhere in a Silver Spring, Maryland government office, meteorologists look at maps of sea surface temperature and attempt to explain something that most people have heard of but few truly comprehend. El Niño is both the beginning and the end of this year’s explanation, and it returned stronger than many had anticipated.
The most severe portion of the Atlantic hurricane season is concentrated around mid-September. The season officially began on June 1 and lasts until November 30. Some of the most catastrophic storms in American history, including Katrina, Maria, and Harvey, have occurred during that window. Therefore, NOAA‘s 2026 outlook, which predicted a 55% chance of below-normal activity, was not a hasty forecast. It mirrored an actual event occurring thousands of miles away in the central Pacific Ocean, where surface temperatures have risen significantly above average, changing wind patterns throughout the hemisphere.
In a nutshell, El Niño is a warming of the tropical Pacific’s eastern and central regions. It seems almost harmless until you consider the real effects of that warmth. Under normal circumstances, cold water rises along the South American coast to fill the void left by trade winds pushing warm surface water westward toward Asia. The warm water rushes back east when El Niño takes hold, weakening or reversing those trade winds. Significant atmospheric knock-on effects include drought in some areas, floods in others, and intensifying heatwaves in already troubled areas. Climate scientists have been closely monitoring El Niño’s well-documented tendency to raise global average temperatures during its active phase, given how warm recent years have already been.
Perhaps El Niño’s most direct impact on American life is the hurricane connection. The vertical wind shear across the Atlantic, or the variation in wind direction and speed at different altitudes, is changed when the Pacific warms. Before developing storms can form hurricanes, they are torn apart by strong wind shear. The physics simply don’t cooperate, much like when you try to spin a top on a tilted surface. This shear is weakened by La Niña, the opposite phase with lower Pacific temperatures, which essentially makes it possible for Atlantic storms to become larger and more structured. Both the 2020 and 2021 seasons were historically active due to La Niña conditions. Forecasters are taking the calmer outlook seriously this year since El Niño has returned and appears to be stronger than first predicted.
However, it’s important to understand what “below normal” actually means. It is not meaningless. For those in its path, a below-normal season with one Category 4 making landfall close to a large city would be disastrous. NOAA’s probability figures do not provide protection against specific storms; rather, they describe statistical likelihood throughout the entire season. It’s still unclear whether the public fully internalizes that subtlety year after year, and sometimes it gets lost in translation.
Although some have lasted much longer, El Niño events usually occur every two to seven years and last between nine and twelve months. The 2015–2016 event was one of the strongest on record, causing widespread coral bleaching throughout the Pacific, severe drought in some parts of Africa, and flooding throughout South America. Observing this one develop with comparable intensity raises valid concerns about what might happen downstream, not only in terms of storm tracks but also in terms of agriculture, water supply, and heat stress in already vulnerable areas.
However, the Atlantic coast is observing for the time being. People are reminded that no forecast is a guarantee during hurricane season. The winds are acting strangely, the ocean is warmer than it should be, and a Pacific-born phenomenon is subtly determining how the Gulf of Mexico will feel over the coming months. It’s not always a good thing for the environment when El Niño returns stronger than anticipated. However, for the time being, there is at least some cautious relief for those who live in Florida, Louisiana, and the Carolina coast.
