2026 Atlantic hurricane season records 83% drop in energy
The Accumulated Cyclone Energy index stands at 19.7, placing the season near the bottom of the modern record despite the formation of ten named storms.
By Fatima Saleh ·
The 2026 Atlantic hurricane season has recorded an Accumulated Cyclone Energy index of just 19.7 as of November 4. This figure sits approximately 83% below the long-term average. Meteorologists note that the Atlantic basin has generated only about 16% of the energy typically accumulated during a standard hurricane season.
Despite the low energy output, the season produced 10 named storms. Hurricane Isaias drove a large share of the total activity. Its ACE contribution was approximately 7.2, which accounts for roughly 37% of the season's entire accumulated energy. Isaias reached Category 3 intensity with maximum sustained winds of 121 mph, making it the strongest hurricane of the year.
Accumulated Cyclone Energy measures the overall intensity and duration of tropical systems. It squares wind speeds and sums them at six-hour intervals while a system maintains tropical storm strength or higher. A powerful hurricane lasting several days contributes far more to the index than a short-lived tropical storm. This metric reflects the total physical force exerted by tropical cyclones rather than a simple count of named events.
Historical comparisons illustrate the current season's quiet nature. Hurricane Ivan in 2004 generated an ACE of 70.4 on its own. That single storm produced more than three and a half times the total energy of the entire 2026 season. The full 2004 season finished with an ACE of 226.9, ranking among the most active on record.
Current projections place 2026 near the bottom of the modern record. The 1983 season holds one of the lowest totals, finishing with approximately 17.4. Other quiet years include 1994 at 32.0, 1997 at 40.1, 2013 at 34.6, and 2015 at 62.7. With a current total of 19.7, this year already falls below every one of those seasons except 1983.
An unusually strong El Nino event has suppressed development by increasing wind shear across the tropical Atlantic and Caribbean. Saharan dust and other unfavorable atmospheric conditions have also limited storm growth. These factors combined to keep the season's overall intensity low despite the regular formation of named systems.
The final tally will depend on any remaining tropical activity before the season ends. The current index already positions 2026 as a statistical outlier in the context of recent decades.
