Number of tropical storms in the Atlantic in 2026?
Short Answer
The model assigns meaningfully lower odds than the market for Above 10 tropical storms in the Atlantic in 2026, at 61.8% vs 78.0%. This divergence stems from forecasts by agencies including NOAA and Colorado State University, which anticipate a below-average 2026 Atlantic hurricane season due to moderate to strong El Niño conditions and Saharan dust activity.
1. Executive Verdict
- Since last update (~51d): Our model significantly decreased odds for Above 10 by -20.2pp, widening its edge over the market.
- Both model and market sharply reduced Above 12 odds (model -31.9pp), compressing the edge market-led.
- Model reduced Above 20 odds more than market (-3.5pp), leading to a widened edge.
- Odds for Above 25 and 30 saw large market-led drops, compressing the edge.
- A below-average Atlantic hurricane season is forecast due to a moderate to strong El Niño. Storm counts exceeding 14 appear unlikely, given NOAA's 8-14 named storm forecast range. * Saharan Air Layer activity currently suppresses Atlantic tropical storm development.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| Above 18 | 10.0% | 5.0% | Exceeding 18 named storms is well above the projected below-average season with maximum 14 storm forecasts. |
| Above 16 | 32.0% | 16.9% | Exceeding 16 named storms is above NOAA's predicted 8-14 activity level for 2026. |
| Above 14 | 42.0% | 23.2% | Above 14 named storms exceeds the upper bound of NOAA's 8-14 named storm forecast for 2026. |
| Above 12 | 39.0% | 26.2% | Leading agencies predict a below-average 2026 season due to El Niño and Saharan dust. |
| Above 10 | 78.0% | 61.8% | NOAA's forecast for named storms in 2026 ranges from 8-14. |
Current Context
One named storm has been observed in the 2026 Atlantic hurricane season. Tropical Storm Arthur, active from June 17 to June 18, 2026, is the only named system to date, as of June 26, 2026 [^][^][^][^][^][^]. Leading agencies generally predict a below-average season for 2026 due to the development of a moderate to strong El Niño. This phenomenon increases vertical wind shear, which inhibits tropical cyclone formation [^][^][^][^]. Colorado State University and NOAA have both lowered their seasonal forecasts accordingly [^][^][^][^].
NOAA forecasts 8-14 named storms, with quiet current tropical conditions. Specifically, NOAA's 2026 Atlantic Hurricane Season outlook predicts a below-normal season, forecasting a total of 8-14 named storms, 3-6 hurricanes, and 1-3 major hurricanes [^]. As of June 26, 2026, the tropics remain quiet. The National Hurricane Center reports no expectation of tropical cyclone development in the Atlantic basin for the next seven days, with Saharan dust noted as a factor currently inhibiting development [^][^][^][^].
2. Market Behavior & Price Dynamics
Historical Price (Probability)
Outcome probability
Date
This market has traded in a defined range with a slight upward bias. The price started at 67.0%, reached a high of 78.0%, and now trades at that peak. Recent activity has been volatile. On June 24, the probability dropped 13 percentage points from 78.0% to 65.0%. This move was attributed to a lack of storm formation, which reinforced early forecasts for a below-average season. The price immediately reversed the next day, spiking 13 points on June 25 to return to 78.0%. This rebound occurred despite reports on that same day of a quiet Atlantic basin suppressed by Saharan dust and El Niño.
The chart shows clear short-term support at the 65.0% level and resistance at 78.0%. These two points define the trading range for late June. Total volume is light at 183 contracts, and sample data indicates days with zero trading activity. This suggests that price movements may be amplified by thin liquidity rather than broad market participation. The price action implies that while bearish fundamentals like a quiet start can trigger sell-offs, buyers have consistently stepped in to defend the mid-60s range. Overall market sentiment, as indicated by the price's recovery to the top of its range, remains biased toward a higher-than-forecast number of storms.
3. Significant Price Movements
Notable price changes detected in the chart, along with research into what caused each movement.
Outcome: Above 10
📈 June 25, 2026: 13.0pp spike
Price increased from 65.0% to 78.0%
What happened: On June 25, 2026, the Atlantic basin was described as "very quiet" and a "ghost town" due to Saharan dust and El Niño, with only one tropical storm (Arthur) having formed and dissipated earlier in the season [^][^][^][^][^][^][^]. June 2026 seasonal forecasts projected a below-average season, anticipating 11 named storms for the entire year, which contradicts any weather-related rationale for an upward market movement [^][^]. The provided research offers no evidence of social media activity, traditional news, or market structure factors that would explain a 13.0 percentage point spike in the prediction market on June 25, 2026 [^][^]. Therefore, based on the available information, social media was irrelevant as a primary driver or accelerant for the reported price movement.
Outcome: Above 16
📉 June 24, 2026: 18.0pp drop
Price decreased from 27.0% to 9.0%
What happened: No specific social media activity was found relating to the 2026 Atlantic hurricane season on or around June 24, 2026, based on the provided sources. The primary driver for the 18.0 percentage point drop in the "Above 16" outcome was likely the ongoing lack of tropical storm activity, which reinforced established expert forecasts for a below-normal season [^][^][^][^][^][^]. As of June 26, 2026, only one named tropical storm, Arthur, had occurred in the Atlantic, aligning with predictions from NOAA, Colorado State University, and the Met Office for 8-14 named storms, making the "Above 16" threshold appear increasingly improbable [^][^][^][^][^][^]. Social media was irrelevant to this specific price movement given the available information.
Outcome: Above 12
📉 June 23, 2026: 13.0pp drop
Price decreased from 64.0% to 51.0%
What happened: The primary driver of the prediction market price drop was the prevailing meteorological consensus forecasting a below-average 2026 Atlantic hurricane season due to El Niño [^][^][^][^]. The official confirmation of El Niño on June 12, 2026, significantly increased confidence in a quieter season [^], with forecasters like Colorado State University revising predictions to ranges such as 11-14 named storms [^][^]. This established narrative likely led to investors adjusting expectations for the "Above 12" outcome by June 23, reinforced by the formation of only one named storm by that time [^][^]. Social media was irrelevant to this specific market movement, as no specific, influential posts or viral narratives related to the 2026 Atlantic hurricane season forecasts were identified around the date of the price drop.
📈 June 17, 2026: 8.0pp spike
Price increased from 57.0% to 65.0%
What happened: The primary driver of the 8.0 percentage point spike on June 17, 2026, was likely the formation of Tropical Storm Arthur, the first named storm of the 2026 Atlantic hurricane season [^][^][^]. This real-world event directly coincided with the price movement, increasing the market's perceived probability of reaching "Above 12" tropical storms for the year. While major meteorological forecasts had projected a range of 8-14 named storms for 2026, placing "Above 12" within a plausible range, the actual occurrence of the first storm confirmed an active season [^][^][^]. Social media was irrelevant as no related activity was identified in the provided information.
Outcome: Above 14
📉 June 15, 2026: 10.0pp drop
Price decreased from 46.0% to 36.0%
What happened: The primary driver for the 10.0 percentage point drop on June 15, 2026, was likely the release of updated traditional weather forecasts predicting a below-average Atlantic hurricane season. Colorado State University (CSU) issued a "June 2026 update" to their forecast, which reduced predicted storm numbers and reinforced a below-average season, typically forecasting 8–14 named storms [^][^]. NOAA also predicted a below-normal 2026 Atlantic hurricane season, with similar ranges, directly lowering the perceived probability of the "Above 14" outcome [^][^][^]. Social media was not a primary driver, as no specific, timely posts or viral narratives linked to this movement were identified.
4. Market Data
Contract Snapshot
This market resolves to YES if the NOAA's National Hurricane Center records more than 12 tropical storms, each with maximum sustained windspeeds of 39 miles per hour or above, between January 1, 2026, and December 1, 2026. Conversely, it resolves to NO if 12 or fewer such storms are recorded, with outcomes verified by the National Oceanic and Atmospheric Administration. The market opens on April 1, 2026, closes on December 1, 2026, and expires at the sooner of the event's occurrence or one day after December 1, 2026, with a projected payout on December 2, 2026.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| Above 10 | $0.77 | $0.35 | 78% |
| Above 14 | $0.50 | $0.61 | 42% |
| Above 12 | $0.51 | $0.61 | 39% |
| Above 16 | $0.32 | $0.90 | 32% |
| Above 18 | $0.17 | $0.90 | 10% |
| Above 20 | $0.14 | $0.91 | 9% |
| Above 25 | $0.07 | $0.97 | 7% |
| Above 30 | $0.04 | $0.98 | 2% |
Market Discussion
Market discussion shows mixed views regarding the number of Atlantic tropical storms in 2026. Some traders anticipate higher numbers, partly due to sustained higher-than-normal Atlantic temperatures that could lead to more organized storms. Conversely, arguments for fewer storms include average African heat waves and, more prominently, a forecasted strong El Niño in August combined with strong wind shear and Saharan Dust, all of which are expected to inhibit tropical cyclone formation.
5. How do the June 2026 seasonal forecasts from NOAA and Colorado State University (CSU) compare in methodology and historical accuracy during past El Niño years?
| 2026 Season Forecast | Below-normal season (NOAA, CSU) [^][^][^] |
|---|---|
| Primary Influencer | El Niño (increases vertical wind shear, inhibits hurricane development) [^][^][^] |
| Prediction Market Trend | Lower-than-average named storms, hurricanes, and major hurricanes [^][^][^][^] |
Both NOAA and Colorado State University (CSU) forecast a below-normal 2026 Atlantic hurricane season. This consensus is primarily attributed to the anticipated effects of El Niño, which typically leads to increased vertical wind shear, a condition known to inhibit hurricane development [^][^][^]. El Niño's influence is recognized for causing abnormal weather patterns globally, affecting hurricane and circulation patterns in various ways [^][^].
NOAA and CSU employ distinct methodologies with varying historical accuracy. NOAA utilizes the Unified Forecast System (UFS), specialized aircraft data, and machine learning for quality control [^][^]. In contrast, CSU integrates statistical models, multi-model ensemble guidance from various climate centers, and a new machine learning model called ACE2 [^][^]. Historically, both organizations have faced significant forecasting challenges during El Niño years, demonstrating fluctuating accuracy but generally performing well in anticipating overall seasonal activity levels, such as in 2023 [^][^][^][^].
6. What specific atmospheric and oceanic conditions in mid-2026 support the consensus forecast of a below-average hurricane season by agencies like NOAA and CSU?
| Dominant Suppressing Factor | Intensifying moderate to strong El Niño event [^] |
|---|---|
| NOAA Below-Normal Season Chance | 55% [^][^][^] |
| CSU Named Storms Forecast | 11 named storms [^][^][^] |
An anticipated El Niño event significantly drives the below-average hurricane forecast. The consensus for a below-average 2026 Atlantic hurricane season is primarily influenced by the expected intensification of a moderate to strong El Niño event, which is considered the dominant suppressing factor [^][^][^][^][^]. This atmospheric condition is projected to increase vertical wind shear across the tropical Atlantic, a phenomenon known to hinder the development of cyclones [^].
Oceanic conditions and agency forecasts indicate a reduced storm season. At the start of the 2026 season, near-to-below-average sea surface temperatures were observed across the deep tropical Atlantic, further supporting reduced hurricane activity [^][^][^]. NOAA's seasonal outlook for mid-2026 assigns a 55% chance of a below-normal season, forecasting 8-14 named storms, 3-6 hurricanes, and 1-3 major hurricanes [^][^][^]. These projections fall below the long-term averages of 14 named storms, 7 hurricanes, and 3 major hurricanes [^][^][^]. Similarly, Colorado State University (CSU) forecasts reduced activity, predicting 11 named storms, 5 hurricanes, and 2 major hurricanes, all of which are below the established long-term averages [^][^][^].
7. Historically, what is the average number of named storms that form after July 1 during moderate-to-strong El Niño years?
| Average Named Storms (Moderate-to-Strong El Ni o Atlantic Hurricane Seasons) | approximately nine [^][^] |
|---|---|
| Average Named Storms (Typical Atlantic Hurricane Season Annually) | approximately 14 [^] |
| Named Storms after July 31 (Typical Atlantic Hurricane Season) | 12 [^] |
The research does not specify storms forming after July 1 in El Niño years. While the research indicates that moderate-to-strong El Niño Atlantic hurricane seasons typically average approximately nine named storms overall [^][^], it does not specify the average number of named storms that form specifically after July 1 during these years. This total is notably lower than a typical Atlantic hurricane season, which generally experiences about 14 named storms annually [^], with approximately 12 named storms usually forming after July 31 [^].
El Niño conditions suppress Atlantic hurricane formation by increasing wind shear. El Niño events are known to reduce Atlantic hurricane activity primarily by increasing vertical wind shear across the basin [^][^]. This elevated wind shear disrupts the development and organization of tropical cyclones. The suppressive effect of El Niño on Atlantic hurricanes is especially pronounced in the latter part of the hurricane season, specifically between September and November [^].
8. Aside from El Niño, what is the significance of the current Saharan Air Layer (SAL) activity, and how could its dissipation before September 2026 affect storm development?
| Moisture Reduction by SAL | Approximately 50% [^][^][^][^][^] |
|---|---|
| NOAA 2026 Named Storms Forecast | 8-14 storms [^][^][^] |
| 2026 Atlantic Hurricane Season Outlook | Below-normal [^][^][^][^] |
Saharan Air Layer currently suppresses Atlantic tropical storm development. This significant atmospheric phenomenon originates over the Sahara Desert, forming a massive, dry, and dusty air mass that typically traverses the tropical Atlantic from late spring to early fall [^]. During June 2026, the Saharan Air Layer has acted as a "protective shield," contributing to a quiet start to the Atlantic hurricane season [^][^][^][^][^][^]. It achieves this by introducing extremely dry air, increasing vertical wind shear, and stabilizing the atmosphere, effectively reducing moisture by approximately 50% and limiting cloud formation through a temperature inversion [^][^][^][^][^][^]. This makes it a primary atmospheric barrier against tropical development [^][^][^][^][^][^].
Forecasters predict a below-normal season, but early SAL dissipation could change this. Both NOAA and Colorado State University (CSU) have forecasted a below-normal 2026 Atlantic hurricane season, with NOAA specifically predicting 8-14 named storms [^][^][^]. Should the Saharan Air Layer dissipate earlier than expected before September 2026, it would remove this crucial atmospheric barrier, potentially allowing tropical disturbances to organize more readily in the latter part of the season [^][^][^]. However, the actual impact of an early dissipation is contingent on the suppressing effects of the developing El Niño not remaining dominant, as El Niño typically increases vertical wind shear and is a primary factor in the below-normal season forecast [^][^][^][^].
9. How does the pace of the 2026 season, with one named storm (Arthur) by late June, track against the timeline of previous below-average hurricane seasons like 2014 and 2015?
| 2026 First Named Storm | Tropical Storm Arthur, June 17 [^][^][^] |
|---|---|
| 2014 First Named Storm | Tropical Storm Arthur, July 1 [^][^][^][^][^][^][^] |
| 2015 First Named Storm | Tropical Storm Ana, May 8 [^][^][^][^] |
The 2026 hurricane season began with an earlier first named storm. Tropical Storm Arthur, the first named storm of the 2026 Atlantic hurricane season, formed on June 17 and dissipated the following day [^][^][^]. This onset was earlier than the 2014 season, which also saw its first named storm, Tropical Storm Arthur, emerge on July 1 after developing into a tropical depression on June 30 [^][^][^][^][^][^][^].
The 2015 season began even earlier, yet all were below-average. In contrast, the 2015 Atlantic hurricane season experienced an even earlier start, with Tropical Storm Ana forming on May 8 [^][^][^][^]. Despite variations in their initial storm timelines, the 2026, 2014, and 2015 seasons share the characteristic of being predicted or ultimately defined as below-average in activity [^][^][^]. El Niño conditions were frequently identified as a significant factor contributing to these suppressed levels of hurricane activity across these seasons [^][^][^].
10. What Could Change the Odds
Key Catalysts
Forecasts from Colorado State University, issued as of June 10, 2026, projected 8 to 14 named storms for the 2026 Atlantic season, with a likely forecast of 11 named storms [^] . These projections are influenced by changing wind patterns over the Atlantic, which are less conducive for hurricanes this year [^].
Key Dates & Catalysts
- Expiration: December 02, 2026
- Closes: December 02, 2026
11. Decision-Flipping Events
- Trigger: As of June 27, 2026, the 2026 Atlantic hurricane season recorded one named tropical storm, Arthur [^] [^] [^] [^] [^] [^] .
- Trigger: Tropical Storm Arthur was active from June 17, 2026, to June 18, 2026 [^] [^] [^] [^] .
- Trigger: The next named storm in the 2026 Atlantic hurricane season is designated Bertha [^] .
- Trigger: Forecasts from Colorado State University, issued as of June 10, 2026, projected 8 to 14 named storms for the 2026 Atlantic season, with a likely forecast of 11 named storms [^] .
13. Historical Resolutions
No historical resolution data available for this series.
