The National Oceanic and Atmospheric Administration (NOAA) defines a tropical storm as a tropical cyclone with maximum sustained winds of 39 to 73 miles per hour (34 to 63 knots). The 2026 Atlantic hurricane season will run from June 1 to November 30, though storms can form outside these dates. The prediction market resolves to Yes if NOAA records more than a predetermined number of tropical storms (with winds of 39 mph or higher) between January 1, 2026 and December 1, 2026. This market directly ties to NOAA's official storm count, which includes named storms that reach tropical storm intensity or higher. The Atlantic hurricane season is a major focus for meteorologists, insurers, emergency managers, and coastal residents. The 2025 season produced 18 named storms, which was above the 1991-2020 average of 14.4 named storms per year. The 2024 season was even more active, with 18 named storms, including 7 hurricanes and 3 major hurricanes. The most active season on record remains 2020, which saw 30 named storms, exhausting the predefined list of names and forcing the use of Greek letters. Several factors influence tropical storm formation in the Atlantic. Sea surface temperatures in the tropical Atlantic and Caribbean are a primary driver, with warmer waters providing more energy for storm development. El Niño and La Niña conditions also play a role; El Niño tends to suppress Atlantic hurricane activity by increasing wind shear, while La Niña tends to enhance it. The Atlantic Multidecadal Oscillation (AMO), a longer-term pattern of sea surface temperature variability, has been in a warm phase since 1995, correlating with more active hurricane eras. Interest in this prediction market reflects broader concerns about climate change and its potential effects on hurricane frequency and intensity. Warmer oceans, linked to rising global temperatures, may increase the number of tropical storms and their potential to intensify rapidly. The 2026 season will be closely watched as forecasters continue to refine seasonal predictions. The market also provides a real-time indicator of how the public and experts perceive the likelihood of an active season, which can influence insurance pricing, energy markets, and disaster preparedness spending.

Historical Context

The Atlantic hurricane record extends back to 1851, though early records are incomplete due to a lack of satellite observations. Reliable basin-wide records begin in 1966 with the start of geostationary satellite coverage. Before that, many storms, especially those that remained at sea, were likely missed. The 1991-2020 average for named storms is 14.4 per year, with a range from a low of 4 in 1983 to a high of 30 in 2020. The most active decade was 2016-2025, which averaged 17.2 named storms per year, well above the long-term average. The 2020 season broke the previous record of 28 named storms set in 2005. The 2005 season was also notable for producing Hurricane Katrina, the costliest hurricane in US history, and Hurricane Wilma, the most intense Atlantic hurricane on record by minimum central pressure. The 2020 season exhausted the list of 21 pre-designated names, forcing the use of the Greek alphabet for only the second time (after 2005). La Niña conditions have been associated with many of the most active seasons. The 2020 La Niña contributed to that record-breaking year. Conversely, the 2023 El Niño was expected to suppress activity, but the season still produced 20 named storms, partly due to record-warm Atlantic sea surface temperatures. This event highlighted that the traditional El Niño suppression effect may be weakening as ocean temperatures rise. The 2024 season, which transitioned from El Niño to La Niña, produced 18 named storms, including Hurricane Helene and Hurricane Milton, both of which caused significant damage in the United States.

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