El Niño generally suppresses hurricane activity in the Atlantic basin rather than boosting it. The pattern works in the opposite direction from what many people assume: when the tropical Pacific warms during an El Niño event, wind conditions over the Atlantic become hostile to developing storms, and fewer hurricanes tend to form there. But the global picture is more complicated, because El Niño can simultaneously ramp up tropical cyclone activity in parts of the Pacific. The answer depends heavily on which ocean basin you care about, and even on exactly where in the Pacific the warming is centered.
Why El Niño Weakens Atlantic Hurricanes
The primary way El Niño influences Atlantic hurricanes is through vertical wind shear, which is the difference in wind speed and direction between the lower and upper atmosphere. A developing hurricane needs its thunderstorm towers to grow tall and organized, and strong wind shear essentially decapitates them, tearing the upper portions of the storm away from its base. During El Niño years, warming in the tropical Pacific alters large-scale atmospheric circulation patterns in a way that increases wind shear across the Caribbean Sea and the tropical Atlantic, right where many Atlantic hurricanes are born.
Research has found that among the various environmental factors influencing Atlantic hurricanes, wind shear appears to be the most decisive. Even when sea surface temperatures in the Atlantic are warm enough to fuel storm development, strong shear during El Niño can prevent powerful hurricanes from forming.1Quaternary International. Atlantic hurricanes—Testing impacts of local SSTs, ENSO, stratospheric QBO—Implications for global warming The mechanism works through the tropical troposphere: when El Niño warms the Pacific enough, it causes warming in the upper atmosphere over the Atlantic region as well. That warming stabilizes the atmosphere and strengthens wind shear, making conditions unfavorable for hurricanes across the main development region where most Atlantic storms originate.2Geophysical Research Letters. Impacts of non‐canonical El Niño patterns on Atlantic hurricane activity
This is why seasonal hurricane forecasts from agencies like NOAA and Colorado State University pay such close attention to the state of the tropical Pacific. An El Niño developing in the spring often signals a quieter Atlantic season ahead, while La Niña, the cooler counterpart, is associated with more active seasons. The El Niño signal is considered one of the most reliable large-scale predictors available for Atlantic hurricane seasonal forecasts, often included alongside Atlantic sea surface temperatures and other climate indices.3Weather and Forecasting. Seasonal Prediction of North Atlantic Accumulated Cyclone Energy and Major Hurricane Activity
Not All El Niños Are the Same
The relationship between El Niño and hurricanes gets considerably messier once you account for the fact that El Niño events come in different “flavors.” The traditional pattern, sometimes called the Eastern Pacific El Niño, features the strongest warming along the equatorial Pacific near South America. But another variety, known as the Central Pacific El Niño or El Niño Modoki, concentrates its warmth in the middle of the Pacific instead. These two types can have strikingly different effects on tropical cyclones around the world.
In the Atlantic, the distinction matters because the Central Pacific El Niño does not always produce the same degree of tropospheric warming over the Atlantic that the Eastern Pacific variety does. Research suggests that the sea surface temperature anomalies associated with non-canonical El Niño patterns are sometimes not strong enough to cause substantial warming in the tropical atmosphere over the Atlantic’s main development region, which is the key factor that ramps up wind shear.2Geophysical Research Letters. Impacts of non‐canonical El Niño patterns on Atlantic hurricane activity In other words, a Central Pacific El Niño might not suppress Atlantic hurricanes as effectively as a classic Eastern Pacific event would.
In the western North Pacific, the flavors produce notably different outcomes for typhoon activity. During traditional El Niño years, typhoon numbers tend to decrease, but the storms that do form originate farther east and tend to be stronger and longer-lived. During El Niño Modoki years, typhoon counts actually increase.4Advances in Meteorology. Impacts of Two Types of El Niño and La Niña Events on Typhoon Activity For the eastern Pacific hurricane basin, both flavors of El Niño tend to boost activity, but through different mechanisms and at different times of the season. The Central Pacific type drives increased activity earlier in the season, while the Eastern Pacific type tends to enhance storms later, from September through November.5Geophysical Research Letters. Modes of hurricane activity variability in the eastern Pacific: Implications for the 2016 season
The Southwest Pacific shows similar sensitivity to El Niño type. Research on tropical cyclone formation in that region has found that both Modoki and Eastern Pacific El Niño patterns significantly alter where and how frequently storms form, with prominent shifts in the typical genesis locations.6Climate Dynamics. Clustering tropical cyclone genesis on ENSO timescales in the Southwest Pacific For people living in cyclone-prone regions, the practical consequence is that knowing “an El Niño is underway” without knowing its flavor gives you an incomplete picture of what to expect.
El Niño in the Eastern Pacific and Western North Pacific
While El Niño tends to quiet the Atlantic, it often does the opposite in the eastern and central Pacific. The same ocean warming that disrupts Atlantic storms creates a more favorable environment for hurricanes on the Pacific side of Central America and Mexico. Warmer waters, lower wind shear, and enhanced atmospheric instability all conspire to produce more and stronger eastern Pacific hurricanes during El Niño years. The 2015-2016 El Niño illustrated this dramatically: research at the time estimated roughly double the mean accumulated cyclone energy for the eastern Pacific hurricane season, with storms expanding their reach into the central Pacific well beyond their usual territory.5Geophysical Research Letters. Modes of hurricane activity variability in the eastern Pacific: Implications for the 2016 season
The western North Pacific, home to the planet’s most powerful typhoons, has a more nuanced relationship with El Niño. Warm Pacific temperatures associated with El Niño and a strengthening event have been linked to the proliferation of typhoons in that basin.7PubMed Central. Tropical cyclones in a year of rising global temperatures and a strengthening El Niño However, looking at overall storm energy across the basin, the picture is asymmetric. Although accumulated cyclone energy in the western North Pacific correlates positively with El Niño conditions broadly, the effect is lopsided: La Niña significantly decreases storm energy, while El Niño produces only a slight change.8Geophysical Research Letters. Asymmetric Impact of El Niño‐Southern Oscillation on Autumn Accumulated Cyclone Energy Over the Western North Pacific So El Niño’s boosting effect in the western Pacific is real but modest compared to the suppressive punch La Niña delivers there.
Rapid Intensification Gets Hit Hard
One of the most dangerous aspects of hurricanes is rapid intensification, when a storm’s winds jump dramatically in a short period. This is what turns a marginal tropical storm into a monster overnight, and it is notoriously difficult to forecast. El Niño’s influence extends to this phenomenon as well, at least in the Atlantic. Research on this topic found nearly three times as many rapid intensification events in La Niña years compared to El Niño years in the Atlantic basin.9Journal of Geophysical Research: Atmospheres. El Niño‐Southern Oscillation, the Madden‐Julian Oscillation and Atlantic basin tropical cyclone rapid intensification That is a substantial disparity. The same study also found that another climate oscillation, the Madden-Julian Oscillation, interacts with the El Niño state to further modulate how likely rapid intensification is. When the active convective phase of the MJO sits over Africa and the western Indian Ocean, rapid intensification becomes about four times more likely than when it sits over the tropical Pacific.
For coastal residents along the U.S. Gulf and East coasts, the practical takeaway is that El Niño years are generally associated not just with fewer Atlantic hurricanes, but with fewer of the sudden-intensification events that make storms so destructive. La Niña years, by contrast, are when the Atlantic becomes both more active and more prone to these sudden jumps in storm strength.
Effects in the Indian Ocean and Southern Hemisphere
El Niño’s reach extends beyond the Pacific and Atlantic. In the Southwest Indian Ocean, which includes the waters around Madagascar and the islands east of Africa, strong El Niño events can actually suppress cyclone activity rather than enhance it. Research covering the period from 1981 to 2013 found that cyclonic activity dropped sharply during strong El Niño events, with very few storms observed during the peak January-to-March period. Although El Niño brings warmer sea surface temperatures and more moisture to the region, which you might expect to fuel storms, it also shifts the subtropical jet in a way that inhibits tropical cyclone formation. When El Niño is strong enough, that jet shift dominates.10Atmospheric Science Letters. Associations between tropical cyclone activity in the Southwest Indian Ocean and El Niño Southern Oscillation
There is also a geographic reshuffling effect. During El Niño, cyclone formation in the South Indian Ocean tends to shift westward, with more storms forming west of a rough dividing line around 75 degrees east longitude and fewer forming to the east. Storm tracks also shift, with fewer cyclones passing southeast of Madagascar but more tracking through the central midlatitude portions of the basin.11Journal of Geophysical Research: Atmospheres. Variation of tropical cyclone activity in the South Indian Ocean: El Niño–Southern Oscillation and Madden‐Julian Oscillation effects The overall count may not change dramatically, but where the storms go changes quite a bit.
Across the Southern Hemisphere more broadly, researchers have documented significant changes in tropical cyclone occurrences depending on whether the Pacific is in its warm or cold phase, though the details vary by sub-basin.12Geophysical Research Letters. On tropical cyclone activity in the Southern Hemisphere: Trends and the ENSO connection The overarching pattern is that El Niño does not simply create more or fewer storms globally. It redistributes them, pulling activity toward some regions while quieting others.
When the Rules Break Down
The 2023 Atlantic hurricane season was a vivid reminder that El Niño’s suppressive effect on Atlantic storms is a tendency, not a guarantee. That year saw a strong El Niño develop, and forecasters initially expected the Atlantic season to be quiet as a result. Instead, it was above normal. The culprit was record-warm sea surface temperatures in the tropical Atlantic, which effectively overpowered El Niño’s influence. Despite what should have been hostile conditions with increased vertical wind shear, the shear during the peak August-to-October months was actually well below normal.13Bulletin of the American Meteorological Society. The 2023 Atlantic Hurricane Season: An Above-Normal Season despite Strong El Niño Conditions
The 2023 season underscores that El Niño is one factor among several. Atlantic sea surface temperatures, the state of the Atlantic Multidecadal Oscillation, African easterly wave activity, and other influences all play roles. When Atlantic waters are sufficiently warm, they can override El Niño’s usual damping effect on wind shear. This matters for how the public interprets seasonal forecasts. Hearing “El Niño is active” does not mean you can let your guard down if you live on the Gulf Coast or in the Caribbean. The probability of a quiet season goes up, but it is far from certain, and an exceptionally warm Atlantic can change the calculus entirely.
Climate Change and El Niño’s Future Influence
One of the pressing questions in climate science is whether global warming will change the frequency or character of El Niño events and, by extension, their influence on hurricanes. Some climate modeling work suggests that extreme El Niño events, those resembling the powerful 1982-83 and 1997-98 episodes, could become roughly twice as common under future greenhouse warming scenarios.14Global and Planetary Change. Extreme cyclone wave climate in the Southwest Pacific Ocean: Influence of the El Niño Southern Oscillation and projected climate change If that projection holds, regions like the Southwest Pacific could see more frequent shifts in cyclone hazard patterns, with intense storms appearing more often in areas east of the dateline during those extreme El Niño years.
At the same time, the background state of the ocean is changing. The Interdecadal Pacific Oscillation, a slow climate rhythm spanning decades, modulates how strong and frequent El Niño events are over long periods and also shapes the position of major convergence zones that drive tropical cyclone formation. The satellite era, which is the period most of our reliable cyclone data comes from, happened to coincide with a stretch of relatively frequent and intense El Niño activity. That means our baseline understanding of “normal” hurricane patterns may already be skewed toward conditions influenced by El Niño.14Global and Planetary Change. Extreme cyclone wave climate in the Southwest Pacific Ocean: Influence of the El Niño Southern Oscillation and projected climate change
The interaction between rising ocean temperatures and El Niño also complicates prediction. As the 2023 season demonstrated, a warmer baseline Atlantic can neutralize El Niño’s hurricane-suppressing influence. If ocean temperatures continue to climb, the historical relationship between El Niño and quiet Atlantic seasons could weaken. Forecasters would still expect El Niño to increase wind shear, but the threshold of Atlantic warmth needed to overcome that shear keeps getting easier to reach.
The Walker Circulation Connection
Behind all of El Niño’s far-flung effects lies the Walker circulation, a massive loop of rising and sinking air that spans the tropical Pacific. Under normal conditions, warm water pools in the western Pacific, air rises there, flows eastward at high altitude, sinks over the cooler eastern Pacific, and returns westward at the surface. El Niño disrupts this loop by shifting the warm water and its rising air eastward. That reorganization sends ripples through atmospheric circulation patterns across the globe, which is how warming in one part of the Pacific ends up changing wind shear over the Atlantic or shifting cyclone formation zones in the Indian Ocean.
Modeling work has explored how different background states of the Walker circulation can modulate which flavor of El Niño tends to occur. Variations in the Walker circulation on multi-decade timescales can change the spatial patterns and how frequently Eastern Pacific versus Central Pacific El Niño events show up.15Journal of Climate. ENSO Diversity in a Tropical Stochastic Skeleton Model for the MJO, El Niño, and Dynamic Walker Circulation Since the flavor of El Niño affects which ocean basins see more or fewer hurricanes, changes to the Walker circulation are not just an academic curiosity. They feed directly into the practical question of where cyclone risk is headed in the coming decades.
What El Niño Means for You If You Live in a Hurricane Zone
If you are on the U.S. Atlantic or Gulf Coast, or anywhere in the Caribbean, an El Niño year generally tilts the odds toward a less active hurricane season. Fewer named storms tend to form, fewer reach hurricane strength, and fewer undergo the rapid intensification that produces catastrophic landfalls. But “less active” is a long way from “safe.” Even a below-average season can produce a devastating landfalling hurricane, and as 2023 showed, exceptionally warm Atlantic waters can override El Niño’s protective effect. One helpful mental model: El Niño lowers the ceiling on how busy the season is likely to get, but it does not move the floor to zero.
If you live in the eastern Pacific basin, along the coasts of Mexico or Central America, El Niño years are the ones to watch more carefully. Activity there tends to ramp up, and storms can push farther west than usual into the central Pacific, occasionally threatening Hawaii. In the western Pacific, the relationship is more complex: storm counts may not change much during El Niño, but the storms that form tend to originate farther east and travel longer distances before making landfall, which can alter which coastlines are most at risk.
For people in the Southern Hemisphere’s cyclone zones, from northern Australia to the island nations of the South Pacific and the waters around Madagascar, El Niño reshuffles the geographic distribution of storms more than it simply raises or lowers the total count. Some communities see fewer storms while others, often farther from the equator or shifted to the east, see more. Paying attention to which type of El Niño is developing can help narrow expectations, but the prediction skill drops off considerably compared to the robust Atlantic relationship.