Coastal communities from the Gulf of Mexico to the Eastern Seaboard are heading into the 2026 hurricane season with a rare signal from federal forecasters: expect fewer storms. NOAA’s Climate Prediction Center assigns a 55 percent probability to a below-normal Atlantic hurricane season, driven largely by a strengthening El Nino that is expected to ramp up vertical wind shear across the main development region and tear apart tropical cyclones before they can organize. The outlook calls for 8 to 14 named storms, 3 to 6 hurricanes, and 1 to 3 major hurricanes, with Accumulated Cyclone Energy projected between 45 and 115 percent of the long-term median. Yet the 2023 season, which unfolded under similarly strong El Nino conditions, defied the same logic and finished above normal, raising pointed questions about how much weight any single climate driver should carry in planning decisions.
El Nino’s wind shear and why 2026 forecasts tilt below normal
The central mechanism behind the below-normal call is straightforward in theory. El Nino warms equatorial Pacific waters, which shifts upper-level wind patterns and increases vertical wind shear over the Caribbean and tropical Atlantic. That shear acts like a headwind at altitude, tilting developing storms and venting their heat engines before intensification can take hold. NOAA’s seasonal outlook ties this season’s suppressed numbers directly to the strengthening El Nino signal, a framing the agency has used in past below-normal years as well.
The 35 percent probability the CPC assigns to a near-normal season and just 10 percent to an above-normal season reflect high confidence that El Nino will dominate the atmospheric setup during peak months. The agency’s ENSO probabilities issued in June 2026 provide the upstream numeric foundation for that confidence, quantifying how likely El Nino is to persist and intensify through the fall. In a 2015 updated outlook, the CPC used nearly identical language, stating that below-normal activity would “reflect a strengthening El Nino,” along with discussion of unfavorable thermodynamic conditions across the main development region. That precedent season also finished quiet, reinforcing the statistical relationship between strong El Nino events and suppressed Atlantic hurricane activity.
For homeowners, insurers, and emergency managers, the ACE range of 45 to 115 percent of median is the number that matters most for planning. ACE integrates storm count, intensity, and duration into a single metric, providing a more complete picture of seasonal energy than raw storm totals. The wide spread of that range, however, signals that forecasters are not ruling out a season that could still land near the long-term average. A below-normal named-storm count does not guarantee a below-normal impact season if even one storm makes a damaging landfall, as past years with relatively few but intense landfalls have shown.
The 2023 exception that complicates El Nino assumptions
The strongest challenge to the 2026 outlook comes from recent history. In 2023, NOAA predicted a near-normal season, citing the expected onset of El Nino as a suppressing factor. The season instead finished above normal. A peer-reviewed analysis published in the Bulletin of the American Meteorological Society and archived in the NOAA repository found that peak-season wind shear in 2023 was well below normal despite strong El Nino conditions. In other words, the mechanism that was supposed to shear storms apart simply did not materialize at the expected strength during the months that matter most.
That finding carries direct implications for the hypothesis embedded in this season’s forecast. If observed peak-season vertical wind shear over the Caribbean exceeds the 2023 anomaly by at least 2 meters per second, final ACE would be expected to finish below 80 percent of the median regardless of how many storms initially form. But no primary NOAA document currently provides measured vertical wind shear values over the main development region for 2026, so the hypothesis cannot yet be tested against real-time observations. The gap between forecast expectation and observed atmospheric conditions is exactly where the 2023 bust occurred, and it is the same gap that could surprise forecasters again if shear fails to increase as projected.
The BAMS analysis confirmed that El Nino tends to increase vertical wind shear across the Caribbean and tropical Atlantic as a general rule. The 2023 exception did not overturn that relationship. It did, however, demonstrate that other factors, including record-warm sea surface temperatures and favorable low-level moisture, can offset the shear signal in individual years. The current CPC outlook does not reproduce detailed sea surface temperature diagnostics for 2026 in its public discussion, leaving an open question about whether ocean heat content might again counteract El Nino’s suppressive influence and support more storms than the headline probabilities suggest.
Gaps in the 2026 outlook and what to watch this summer
Several pieces of evidence that would sharpen the forecast are not yet available. The CPC’s ENSO strength probabilities confirm that El Nino is expected to persist, but the exact numeric breakdown of atmospheric responses over the Atlantic – including vertical wind shear, midlevel humidity, and subtropical high pressure strength – will only be known as the season unfolds. Those variables can modulate or even overwhelm the canonical El Nino signal, as 2023 demonstrated when shear remained anomalously weak during the core months of August through October.
One key unknown is how quickly the Atlantic main development region warms relative to the long-term average. If sea surface temperatures there surge well above normal, they can provide extra fuel for storms that do manage to form in brief windows of low shear. Another is the configuration of the Azores-Bermuda high, which steers storms either harmlessly out to sea or toward the Caribbean and U.S. coastline. None of these factors are forecast with the same lead-time skill as ENSO, which is why seasonal outlooks tend to emphasize El Nino and La Nina even though they are only part of the story.
For decision-makers, the most practical approach is to treat the below-normal forecast as a tilt in the odds, not a guarantee. Emergency managers should continue to plan for at least one significant landfall, because seasonal ACE and storm counts say little about where individual storms will track. Insurers and reinsurers, who often rely on seasonal guidance to calibrate risk portfolios, may find that the wide ACE range in the 2026 outlook argues for caution rather than complacency, especially in light of the recent forecast miss in 2023.
Residents along the coast can also use the early-season lull that sometimes accompanies El Nino years to close preparation gaps that were exposed in recent storms. That means updating evacuation plans, reviewing flood and wind insurance coverage, and hardening homes against wind and water. A quiet forecast year is not an invitation to stand down; it is an opportunity to get ready before a surprise storm appears on the map.
Ultimately, the 2026 hurricane season will serve as another test of how well forecasters can translate a strong El Nino signal into concrete, regional outcomes over the Atlantic. If vertical wind shear strengthens as expected and ACE finishes in the lower half of the projected range, confidence in the traditional ENSO-hurricane link will be reinforced. If, instead, warm Atlantic waters and other atmospheric quirks again overpower El Nino’s influence, the scientific community will face renewed pressure to refine seasonal models and communicate uncertainty more explicitly. Until then, communities from Texas to New England will navigate the familiar tension of hurricane season: hoping the forecast for fewer storms is right, while preparing as if it might be wrong.
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*This article was researched with the help of AI, with human editors creating the final content.
