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Will there be 0 hurricanes during the Atlantic Hurricane Season in 2026?

polymarketClimate and Weather·2026-10-01·view on polymarket ↗
57%
Agent
61%
Market Price
-3.8%
Edge
59%
Confidence
25,943
Volume
2.0c
Spread
60
Days to resolution
4
Markets in event
final rationale
Mean of 5 draws (0.57, 0.56, 0.57, 0.57, 0.59). (0) Not resolved. The NHC homepage and dashboard for Oct 1 show no Atlantic cyclones and no Atlantic hurricane all season; Fay peaked at 70 mph, just under the 74 mph threshold. YES still needs the basin to stay below hurricane strength on every NHC advisory through Nov 30. (a) About 61 days remain, covering October and November, with the first week already forecast quiet by NHC's 7-day outlook. (b) If nothing changes, YES: the record-strong El Niño shear is forecast by CPC to persist or strengthen (75% chance of a historic event for OND), and Fox Weather's Norcross expects the environment to stay hostile. (c) NO scenario: the southern Gulf development signal that Lowry and Arman flag for about 8 days out, fed by record-warm Gulf water and Eastern Pacific moisture, briefly spins up into a Cat 1 before shear arrives. Alternatively, a late-October or November subtropical or high-latitude system reaches 74 mph, which only takes one brief advisory. (d) YES scenario: shear keeps tearing apart every disturbance, like Fay, Gonzalo and Hanna, and the season ends with zero hurricanes, as in 1907 and 1914. The market sits at 61% after a sharp rally, while CSU's Klotzbach puts a shutout at about 50%. Historical strong El Niño years split roughly evenly on whether they produced October–November hurricanes: 1982 and 1997 did not, 2015 and 2009 did. This year's suppression is more extreme than those, and the first week of October is effectively locked in. I land slightly below the market at about 57%, giving weight to the concrete Gulf signal and the low one-storm bar.
price vs. prediction
market price agent forecast at t+0
17 follow-ups
re-scan context
This market has been scanned before. Previous predictions:
datepredictedmarket priceconfidence
2026-09-21 36% 36% 57%
2026-09-14 22% 25% 57%
1. Planner Opus 5.5 · picks the research tools
Tools chosen: polymarket_direct resolution_source wikipedia polymarket_related kalshi_related
Planner reasoning
It is already October 1, 2026, so the key question is whether any Atlantic hurricane has been designated since the market was created. The NHC pages and the Wikipedia season article will show this directly. The Polymarket price anchors the estimate, and related markets on other hurricane-count buckets give cross-checks.
2. Research parallel tool calls + 4 web research loops (Sonnet 5) · read raw by the forecasters
at a glance
RESEARCH DIGEST (built in code: tool summaries and each report's bottom line; the forecasters read the full tool outputs and reports) Tools - polymarket_direct: ## This Market's Polymarket Data **Will there be 0 hurricanes during the Atlantic Hurricane Season in 2026?** - Current price (probability): 61.00% (live; bid 60% / ask 62%) - 7-day price change: +24.50% - 30-day price change: +43.50% - Total volume: $25,943 (USD notional) - Price range: 5.50% - 61.00% - Data points: 65 days - resolution_source: already_resolved=unclear; matches_criteria=True; last_updated=Thu, 01 Oct 2026 21:37:29 UTC. The NHC homepage (dated Oct 1, 2026) shows Atlantic activity limited to the 'Remnants of Fay' with only a low (10%) formation chance, and lists active hurricanes only in the Eastern Pacific (Hurricane Rachel) and Central Pacific systems; no Atlantic hurricane is reported as active or having formed. - wikipedia: Fetched 1 Wikipedia entries (0 missing pages). - polymarket_related: Polymarket search over 2 keyword(s), kept 16 matches. keyword 'hurricane 2026': 8 markets | keyword 'Atlantic hurricane season': 8 markets - kalshi_related: 1 related markets / summaries. keyword 'Atlantic hurricanes 2026': ok | keyword 'hurricane': no matches Research loops, bottom lines - current state: As of October 1, 2026, the Atlantic has produced eight named storms but zero hurricanes all season — an unprecedented streak not seen since 1914 — and NHC's current 7-day outlook shows no tropical cyclones active or expected to form in the Atlantic, meaning the "0 hurricanes" outcome remains squarely in play with two months (peak-to-late season) still remaining before the November 30 deadline. - base rate: Historically, a hurricane-free Atlantic season is extremely rare (only 2 of ~175 recorded seasons, both over a century ago, in a less-complete observational record), but 2026 has already broken the modern satellite-era record for latest first hurricane and is the quietest hurricane-wise season on record, with a strong El Niño actively suppressing development; the outside view thus gives this a non-trivial but still clearly minority chance of resolving YES, substantially higher than the ~1% histo - yes case: The single most likely path to YES is simple continuation of current conditions — the historically extreme, CPC-forecast-to-persist-or-strengthen El Niño wind shear keeping the Atlantic hostile through October–November, with no system currently forecast by NHC to reach hurricane strength in the next 7-10 days and only marginal, low-confidence Gulf/Caribbean disturbances on the horizon; this is reinforced by the contract's explicit rule that only initial (not reanalyzed) NHC advisories count, rem - no case: The NO case rests on Klotzbach's own updated ~50% (not near-certain) odds of a shutout, an explicitly flagged Gulf-of-Mexico/Bahamas development zone being watched by NHC-adjacent forecasters for early-to-mid October, record-warm Gulf waters as fuel, and the fact that two months (including the first half of October, which Klotzbach himself calls still-active) remain before the deadline — all pointing to a non-trivial, roughly even chance that at least one hurricane still forms and the market res
tools
toolstatustimeitemssummary
polymarket_direct OK 0.3s 1 ## This Market's Polymarket Data **Will there be 0 hurricanes during the Atlantic Hurricane Season in 2026?** - Current price (probability): 61.00% (live; bid 60% / ask 62%) - 7-day price change: +24.50% - 30-day price change: +43.50% - Total volume: $25,943 (USD notional) - Price range: 5.50% - 61
resolution_source OK 6.2s 1 already_resolved=unclear; matches_criteria=True; last_updated=Thu, 01 Oct 2026 21:37:29 UTC. The NHC homepage (dated Oct 1, 2026) shows Atlantic activity limited to the 'Remnants of Fay' with only a low (10%) formation chance, and lists active hurricanes only in the Eastern Pacific (Hurricane Rachel
wikipedia OK 0.3s 1 Fetched 1 Wikipedia entries (0 missing pages).
polymarket_related OK 0.4s 16 Polymarket search over 2 keyword(s), kept 16 matches. keyword 'hurricane 2026': 8 markets | keyword 'Atlantic hurricane season': 8 markets
kalshi_related OK 0.8s 1 1 related markets / summaries. keyword 'Atlantic hurricanes 2026': ok | keyword 'hurricane': no matches
research loops · 4/4 ok · 15 searches · 8 page reads
dimensionstatustimesearchespage readsreport
current state OK 27s 4 2 4297 chars
base rate OK 26s 3 2 4397 chars
yes case OK 36s 3 3 5769 chars
no case OK 37s 5 1 5351 chars
report: current state
- [2026-10-01] The NHC's live dashboard states: "There are no tropical cyclones in the Atlantic at this time." (nhc.noaa.gov/cyclones/) - [2026-10-01] NHC's 8:00 AM EDT Atlantic Tropical Weather Outlook: tropical cyclone formation is not expected in the Atlantic basin over the next 7 days, per Forbes' summary: "The most recent Tropical Weather Outlook issued Thursday morning by the National Hurricane Center is pretty clear. 'Tropical cyclone formation is not expected over the next 7 days'" (forbes.com) - [2026-10-01] As of October 1, "in 2026, there have been no hurricanes in the Atlantic basin so far. The National Hurricane Center stated that tropical cyclone formation is not expected over the next seven days, ensuring the first week of October will pass without a hurricane." (forbes.com) - [2026-09-21] A regional outlet reported: "The Atlantic basin has reached late September without a single hurricane forming for the first time since 1914." (wcax.com) - [2026-09-22] CBC reported the quiet season is tied to El Niño: "'Normally we have to blame like four or five different things, but this year, I think we really can pretty much put all the blame on El Niño,' said Phil Klotzbach, a senior research scientist in the Department of Atmospheric Science at Colorado State University." (cbc.ca) - [2026-09-25] NOAA's mid-season updated outlook, cited in coverage of Tropical Storm Gonzalo, now expects "between seven and 13 named storms this year. Of those, two to six would become hurricanes. It also predicted that there might not be any major hurricanes this year, or at most two." (spokesman.com) - [2026-09-26] Weather.com noted only two Septembers since WWII have produced zero Atlantic hurricanes (1962, 1994), and concluded 2026 is on track to become the third such case: "Neither Fay nor Gonzalo in the far eastern Atlantic are forecast to become hurricanes. So it appears 2026 will be the third Atlantic hurricane shutout over the past 82 years." (weather.com) - [2026-09-28/29] The 8th named storm, Tropical Storm Hanna, formed northeast of Bermuda; coverage noted "Hanna will encounter a lot of wind shear, which will keep it from becoming a hurricane. That continues the record-long streak of no hurricanes in a season. If we go the entire season without a hurricane, this year will join 1914 and 1907 for the only season without a hurricane." (cbs17.com) - [2026-10-01] The NHC North Atlantic seasonal summary table as of 15 UTC October 1 lists the running named-storm/hurricane counts for 2026 vs. normal, confirming the season tracker is active and updated daily (nhc.noaa.gov/data/tcr/index.php) - [2026-10-01] Unofficial live tracker (sourced from NHC feeds) recorded season totals as of late September: "9 Named storms recorded, 0 Hurricanes recorded, 0 Major hurricanes recorded" (hurricanetracker.cc, data as of Sep 28) - [2026-10-01] The Atlantic's inactivity contrasts sharply with a hyperactive Eastern/Central Pacific season this week, where Hurricane Rachel is strengthening off Mexico and Tropical Storm Nolo threatens Hawaii — underscoring that Atlantic quiet is basin-specific, not a global lull (nhc.noaa.gov/gtwo.php; nhc.noaa.gov/mobile/) - [2026-10-01] Wikipedia's continuously updated season article lists current totals as: "Total depressions: 7, Total storms: 7, Hurricanes: 0, Major hurricanes (Cat. 3+): 0" (figures slightly lag the Hanna update); it also confirms "As of September 2026, the season has been extremely inactive due to a very strong El Niño event in the Pacific" (en.wikipedia.org/wiki/2026_Atlantic_hurricane_season) BOTTOM LINE: As of October 1, 2026, the Atlantic has produced eight named storms but zero hurricanes all season — an unprecedented streak not seen since 1914 — and NHC's current 7-day outlook shows no tropical cyclones active or expected to form in the Atlantic, meaning the "0 hurricanes" outcome remains squarely in play with two months (peak-to-late season) still remaining before the November 30 deadline. NOT FOUND: No NHC Tropical Cyclone Report or advisory anywhere in 2026 has classified any Atlantic storm as a hurricane (Category 1+); no evidence of any system currently forecast to reach hurricane strength in the Atlantic within the next 7 days was found as of October 1, 2026.
report: base rate
- [2026-10-01] NHC's current Atlantic tropical weather outlook confirms "There are no tropical cyclones in the Atlantic at this time" as of 800 PM EDT Sept 30, 2026, with no development expected in the near term. Source: https://www.nhc.noaa.gov/ - [2026-09-30] Wikipedia's live season tracker shows the 2026 Atlantic season has 7 total storms and 0 hurricanes, with strongest storm Fay reaching only 70 mph , below the 74 mph hurricane threshold. Source: https://en.wikipedia.org/wiki/2026_Atlantic_hurricane_season - [2026-09-30] AccuWeather's updated outlook states AccuWeather is forecasting the possibility of zero hurricanes forming during the 2026 season, which would be the first hurricane-free Atlantic season since 1914 , and its chief hurricane expert called it "one of the most extraordinary Atlantic hurricane seasons in modern history." Source: https://www.mainstreetdailynews.com/weather/accuweather-first-hurricane-free-atlantic-season-since-1914 - [2026-09-30] A Yahoo/AP-syndicated weather report notes historically there have been two Atlantic seasons with zero documented hurricanes, but the lack of satellites in earlier years raises the possibility hurricanes were missed, with the fewest hurricanes in any satellite-era season being two , underscoring how unprecedented a 2026 shutout would be in the modern record. - [2026-09-30] The same report states this is "already a record-long wait for the Atlantic's first hurricane of any season in the modern satellite era, previously only as late as Sept. 11 in both 2013 and 2002" , confirming 2026 has already broken the prior latest-first-hurricane record. - Base-rate (outside view, pre-2026): In the official HURDAT record (back to 1851), only two seasons — 1907 and 1914 — are the only two Atlantic seasons without a storm of hurricane intensity . That is roughly 2 out of ~175 recorded seasons (~1%), though pre-satellite-era records (pre-1966) are considered less reliable and may have missed weak/short-lived hurricanes. - [2026-09-30] US News reports experts calling the current hurricane-free stretch "very rare," with records showing this is the latest in the season that the Atlantic basin has gone without a recorded hurricane , attributing it to the ongoing El Niño. - [2026-09-30] CBC quotes CSU hurricane researcher Phil Klotzbach attributing the inactivity almost entirely to the El Niño pattern suppressing Atlantic development this year, a view echoed across all outlets surveyed. - Pre-season forecasts (CSU, NOAA, UKMO, TSR, University of Arizona) from April–August 2026 all called for a below-average season but none predicted zero hurricanes — median pre-season expectations were in the 2-9 hurricane range; the zero-hurricane outcome has only emerged as a live possibility in September as the season has unfolded contrary to pre-season expectations. - [2026-09-30] Wikipedia's live tracker further notes on September 11, the 2026 season surpassed the latest date for the first Atlantic hurricane of a season in the satellite era, and as of September 2026 the season has been extremely inactive due to a very strong El Niño event . - With only two months remaining (October–November) and the climatological peak (Sept 10) already passed, the historical base rate strongly favors at least one hurricane forming even in quiet years — October has produced hurricanes in most seasons — but 2026's record-setting inactivity through month's end is itself an outlier event with no modern precedent, making standard base rates less reliable as a sole guide. BOTTOM LINE: Historically, a hurricane-free Atlantic season is extremely rare (only 2 of ~175 recorded seasons, both over a century ago, in a less-complete observational record), but 2026 has already broken the modern satellite-era record for latest first hurricane and is the quietest hurricane-wise season on record, with a strong El Niño actively suppressing development; the outside view thus gives this a non-trivial but still clearly minority chance of resolving YES, substantially higher than the ~1% historical base rate would suggest in isolation, yet still below even odds given ~2 months of season remain. NOT FOUND: No official NHC or NOAA statement explicitly forecasting a probability of a "zero hurricane season" for 2026; no polling or prediction-market-specific track record data on this exact contract type from prior seasons.
report: yes case
YES means: no Atlantic storm reaches hurricane intensity (74+ mph sustained winds, Cat 1+) on any NHC advisory issued between market creation and November 30, 2026 11:59 PM ET — i.e., the 2026 Atlantic season finishes with zero hurricanes per NHC's real-time advisories. - [2026-10-01] As of Oct 1, the season is at 8 consecutive storms without a hurricane to start the season , and in the satellite era (since 1966) there has "never been an entire season season without at least one [hurricane]" — meaning the specific "zero hurricanes all season" outcome bettors are pricing has literally no modern precedent, only pre-satellite 1907/1914 analogs, which somewhat increases uncertainty but the current trajectory is unambiguously toward that record. Source: clickorlando.com. - [2026-10-01] Fox Weather's Bryan Norcross confirms the mechanism holding: "The band of hostile winds caused by the extra-strong El Niño should rip on anything that tries to develop... the overall atmospheric environment over the Atlantic, the Caribbean, and the Gulf is forecast to remain, on average, hostile." - [2026-10-01] Norcross also notes no development is expected for the next week, but the weather pattern over the southwestern Gulf will become, at least briefly, more conducive for development in about seven or eight days, and whether a disturbance can take advantage of that and spin up is another question — the only near-term watch area is marginal and not imminent. - [2026-10-01] Separately, Yale Climate Connections reports a Mexico-coast disturbance has a "another system could form by mid- to late-week south of southern Mexico... the National Hurricane Center gives the disturbance a 70% chance of developing into a tropical cyclone" — but this is explicitly an Eastern Pacific system near southern Mexico, not an Atlantic basin threat, reinforcing that Atlantic development odds remain low even as Pacific activity (Rachel, Nolo) surges. - [2026-09-30] CSU's Phil Klotzbach, quoted by National Geographic, said it's still possible we may see an Atlantic hurricane... And it only takes one hurricane to cause major destruction — the strongest on-record scientist caveat against assuming YES is locked in; wind shear alone doesn't guarantee zero. - [2026-09-30] Klotzbach told National Geographic that since July, these winds are well known to result in quieter hurricane seasons and separately noted wind shear has been the strongest on record since 1979 in key Atlantic development zones (nationalgeographic.com), a persistence argument favoring continuation of the shutout into October-November. - [2026-09-25] NOAA/CPC's authoritative seasonal update (6 August issuance, still governing) assigns a 75% chance of a below-normal season... 7–13 named storms, of which 2–6 are forecast to become hurricanes, and 0–2 are expected to be major hurricanes — even this revised official forecast still center-lines on a nonzero hurricane count, but its lower bound of "2-6 hurricanes" has already been falsified for 8 storms, showing the season is underperforming even the lowered bar, consistent with an eventual zero. - [2026-10-01] CPC's ENSO advisory states during September-November through November-January 2026-27, there is a greater than 90% chance of a very strong El Niño, and during the October-December 2026 season, a 75% chance of a historic event — meaning the suppressing mechanism is forecast to persist or intensify through the remaining two months of the season, the key structural argument for YES. - [2026-09-30] AccuWeather's Paul Pastelok stated the current setup shows "a strong impact in both the Atlantic and Pacific basins, with extreme wind shear limiting Atlantic storm development, while the Pacific remains quite active as we expected back in the spring" , reinforcing the shear mechanism is basin-wide and ongoing, not a transient early-season fluke. - [2026-09-30] Forbes/Yahoo meteorologist Jonathan Erdman (via syndication) assessed "there is a very real possibility that we get to the middle of October without a hurricane. At that point, we will only be a few weeks away from the end of the 2026 Atlantic hurricane season" — framing the shrinking remaining window as itself evidence for YES. - [2026-09-30] Clickorlando also flags a resolution-relevant caveat that could complicate (not help) the YES case: "Fay and Edouard both were close to achieving hurricane status. While never upgraded in real time, there is a chance during routine post-season analysis that one or both could be upgraded" — but the market's own rules state it resolves on the *initial* NHC advisory and ignores later downgrades/upgrades, so a post-season reanalysis bumping Fay to hurricane strength would NOT flip this market to "No" under the stated resolution criteria, strengthening the case that the YES path is specifically about real-time advisories only. BOTTOM LINE: The single most likely path to YES is simple continuation of current conditions — the historically extreme, CPC-forecast-to-persist-or-strengthen El Niño wind shear keeping the Atlantic hostile through October–November, with no system currently forecast by NHC to reach hurricane strength in the next 7-10 days and only marginal, low-confidence Gulf/Caribbean disturbances on the horizon; this is reinforced by the contract's explicit rule that only initial (not reanalyzed) NHC advisories count, removing the main pathway by which a borderline storm like Fay could retroactively flip the outcome to No. NOT FOUND: No source quantifying NHC's or CSU's explicit probability of a literal zero-hurricane season for the remaining October-November period; no confirmation of any named Atlantic/Gulf system currently classified above tropical storm strength as of Oct 1.
report: no case
YES means: the 2026 Atlantic hurricane season finishes (through Nov. 30, 2026 11:59 PM ET) with zero storms ever classified as a hurricane (Cat. 1+, 74mph+) by an NHC initial advisory. This dimension argues the NO case — i.e., that at least one Atlantic hurricane still forms before the deadline. - [2026-10-01] Even with the record-long drought, CSU's own hurricane scientist now sizes the hurricane-free outcome at only roughly a coin flip: Colorado State University hurricane researcher Phil Klotzbach estimated that there is a about a 50% chance of a hurricane-free season after September came and went with four named storms, but no hurricanes. That 50% estimate had been as low as 15% just weeks earlier, per Klotzbach's own numbers (source: yahoo.com). - [2026-10-01] Klotzbach's caveat underscores how fragile the streak is: "All it takes is for something weird to happen late in the season," Klotzbach cautioned. (yahoo.com) - [2026-09-22] Barely a week earlier, Klotzbach himself doubted a shutout was likely at all: "I'd be surprised if we end up a season with zero hurricanes, but probably the odds of getting anything substantial out of the deep tropics are pretty low." (cbc.ca) - [2026-10-01] A live wildcard is already flagged in NHC's own basin: Tampa Bay Times reporting states the season does not end until Nov. 30, meaning there is still plenty of time for a storm to form — if not in the Atlantic, then in the Gulf of Mexico , explicitly naming the Gulf as the most likely source of a late-season hurricane. - [2026-09-30] A separate Yahoo weather report frames the same Gulf threat directly: Florida isn't in the clear yet as record-warm Gulf waters could fuel a late-season hurricane even during this exceptionally below average year. - [2026-10-01] Forbes' own meteorology column, while noting the current lull, concedes uncertainty rather than certainty about a shutout: While there are some potential signals to watch in the Gulf, there is conflicting information on whether anything will develop. Even if it does, it is not clear that it would reach hurricane status. - [2026-09-30/10-01] A Florida-focused weather report on the same question cites forecasters actively watching a specific zone for the next development: "As we head into October, the main area we are watching for possible development is from the southern Gulf to the Southeast coast near the Bahamas," Arman said. "A slow-moving front is expected to move into the Gulf this weekend into next week." (aol.com) - [2026-09-30/10-01] Michael Lowry (WPLG hurricane specialist) is quoted eyeing the same target zone: "Long-range models are starting to home in on the southern Gulf in about a week for the possibility of development along the tail of a stalled front with perhaps a boost from spin and moisture out of the eastern Pacific," — i.e., a concrete near-term formation pathway exists even as NHC's 7-day outlook shows nothing imminent. - [2026-09-22] Klotzbach's own base-rate framing cautions against assuming the season is effectively over: "Typically, by the time you get to, say, mid-October, the season is really starting to wind down," which implies the first half of October — still ahead — is historically a period when hurricanes do form, not a dead zone. - [2026-09-30] NOAA itself (unlike CSU) has stopped short of forecasting a shutout, with NOAA's Rosencrans explicitly declining to call it: Rosencrans declined to make a prediction on the chance for a hurricane-free season. NOAA's own numeric forecast still allows for hurricanes: NOAA's official 2026 seasonal forecast is for seven to 13 named storms, two to six hurricanes and zero to two major hurricanes. - [2026-10-01] Even the historical record cited as support for a shutout is thin and contested: All the dates on your chart are very old so it's likely there were hurricanes missed in those days without satellites. The current situation is clearly unprecedented in the satellite era. — meaning there is no reliable satellite-era precedent for how a season like this actually resolves in October–November, reducing confidence that the current streak continues to zero. - [2026-10-01] Mechanically, the market resolves on the NHC's initial advisory for any single storm reaching 74 mph — a low bar requiring only one brief, even marginal, hurricane-strength burst anywhere in the basin (including short-lived subtropical or Gulf systems) at any point before Nov. 30, which is a much lower threshold than "an active hurricane season." BOTTOM LINE: The NO case rests on Klotzbach's own updated ~50% (not near-certain) odds of a shutout, an explicitly flagged Gulf-of-Mexico/Bahamas development zone being watched by NHC-adjacent forecasters for early-to-mid October, record-warm Gulf waters as fuel, and the fact that two months (including the first half of October, which Klotzbach himself calls still-active) remain before the deadline — all pointing to a non-trivial, roughly even chance that at least one hurricane still forms and the market resolves NO. NOT FOUND: No NHC advisory, watch, or warning for any system currently near hurricane strength as of October 1, 2026; no specific percentage development odds yet assigned to the Gulf/Bahamas system referenced by Lowry and Arman; no official NOAA numeric probability of a hurricane-free 2026 season.
3. Forecasters 5 draws · Opus 5.5 + GPT-5.6 Sol · plain mean
claude-opus-5-5
55% conf
Yes 57%
No 43%
(0) Not resolved. The NHC homepage and dashboard for Oct 1 show no Atlantic cyclones and no Atlantic hurricane all season; Fay peaked at 70 mph, just under the 74 mph threshold. YES still needs the basin to stay below hurricane strength on every NHC advisory through Nov 30. (a) About 61 days remain, covering October and November, with the first week already forecast quiet by NHC's 7-day outlook. (b) If nothing changes, YES: the record-strong El Niño shear is forecast by CPC to persist or strengthen (75% chance of a historic event for OND), and Fox Weather's Norcross expects the environment to stay hostile. (c) NO scenario: the southern Gulf development signal that Lowry and Arman flag for about 8 days out, fed by record-warm Gulf water and Eastern Pacific moisture, briefly spins up into a Cat 1 before shear arrives. Alternatively, a late-October or November subtropical or high-latitude system reaches 74 mph, which only takes one brief advisory. (d) YES scenario: shear keeps tearing apart every disturbance, like Fay, Gonzalo and Hanna, and the season ends with zero hurricanes, as in 1907 and 1914. The market sits at 61% after a sharp rally, while CSU's Klotzbach puts a shutout at about 50%. Historical strong El Niño years split roughly evenly on whether they produced October–November hurricanes: 1982 and 1997 did not, 2015 and 2009 did. This year's suppression is more extreme than those, and the first week of October is effectively locked in. I land slightly below the market at about 57%, giving weight to the concrete Gulf signal and the low one-storm bar.
claude-opus-5-5
50% conf
Yes 56%
No 44%
(0) The event is not resolved. NHC's homepage and the research both show zero Atlantic hurricanes so far in 2026: the strongest storm, Fay, peaked at 70 mph, and no system has been reported at hurricane strength. YES needs the shutout to last through Nov 30, while NO needs only one initial NHC advisory at 74 mph or more. (a) About two months remain, covering October and November. Early October is still climatologically active, especially in the Gulf and western Caribbean. (b) The status quo favors YES: there are no Atlantic cyclones now, NHC's 7-day outlook expects no formation, and CPC gives a >90% chance that the very strong El Niño and its record wind shear persist. (c) NO scenario: a gyre or the tail of a stalled front spins up a system in the southern Gulf around Oct 8–15, fed by record-warm Gulf water and Eastern Pacific moisture, as Lowry and Arman flag. A brief Cat 1 or a high-latitude subtropical-to-tropical transition would also count. (d) YES scenario: shear stays hostile, the Gulf window passes with at most a tropical storm, and the late-season cold-front regime ends things by early November. The market sits at 61% after a sharp run-up. Klotzbach's latest independent estimate is ~50%, and past strong El Niño years still produced Oct–Nov hurricanes fairly often (Tammy in 2023, Joaquin and Kate in 2015). I shade slightly below the market to 0.56, since a single marginal storm is enough for NO and an identified Gulf development window is coming up.
claude-opus-5-5
50% conf
Yes 57%
No 43%
(0) The condition is not resolved yet. As of Oct 1 the NHC shows no Atlantic tropical cyclones, and no advisory this season has classified any Atlantic storm as a hurricane. The strongest so far was Fay at 70 mph. A YES still requires no Atlantic storm reaching 74 mph on any NHC advisory through Nov 30. (a) About two months remain, from Oct 1 to Nov 30, though NHC's 7-day outlook says no formation is expected, which effectively removes the first week. (b) If nothing changes, this resolves YES. CPC gives a >90% chance of a very strong El Niño through autumn, and record shear argues for persistence. (c) NO path: a stalled front over the southern Gulf, flagged by Lowry and others for about 7–10 days out with Pacific moisture and record-warm Gulf waters, briefly spins up to Cat 1. Alternatively, a late-season subtropical or high-latitude system becomes a hurricane, as Kate in 2015 and Tammy in 2023 did in strong El Niño years. (d) YES path: shear keeps ripping apart anything that forms through mid-October. After that, climatology winds down, and 2026 joins 1907 and 1914 as hurricane-free seasons. The market is at 61% after a sharp run-up, while CSU's Klotzbach estimates about 50%. Strong El Niño analogs are mixed: 1982 and 1997 had no October or November hurricanes, while 2015 and 2023 did. This season's suppression is beyond those analogs, which supports leaning YES, but slightly below the market price.
gpt-5.6-sol
68% conf
Yes 57%
No 43%
(0) The condition has not already resolved: NHC showed zero Atlantic hurricanes through October 1, but at least one storm could still receive an initial 74+ mph advisory before November 30 at 11:59 PM ET. (a) Roughly 60 days remain, although the climatological peak has passed and NHC expects no Atlantic tropical cyclone formation during the next seven days. (b) If current conditions persist, the market resolves Yes, with the strong El Niño and record wind shear continuing to suppress intensification. (c) The No scenario is a Gulf, Caribbean, or Bahamas system exploiting warm water and a brief favorable window in October or November, reaching hurricane strength in even one NHC advisory. (d) The Yes scenario is continued hostile shear through the shrinking late-season window, while the rules protect Yes from any postseason reanalysis upgrading borderline storms such as Fay. I price Yes at 57%, slightly below Polymarket's 61% anchor because CSU researcher Phil Klotzbach's approximately 50% estimate and the identified early-October Gulf development pathway provide specific downside, though the empty seven-day NHC outlook supports keeping Yes above even odds.
gpt-5.6-sol
72% conf
Yes 59%
No 41%
(0) The condition is not yet resolved: NHC showed no Atlantic hurricane through October 1, but a qualifying initial NHC advisory could still occur through November 30 at 11:59 PM ET. (a) Roughly 60 days remain, although NHC reports no active Atlantic cyclone and no tropical-cyclone formation expected during the next seven days. (b) If current conditions persist, the market resolves Yes, with the season remaining at zero hurricanes; post-season reanalysis of borderline storms would not change that under the stated initial-advisory rule. (c) The No scenario is that a Gulf, Caribbean, or Bahamas disturbance exploits warm water during October and briefly reaches the relatively low 74 mph threshold despite the hostile broader pattern. (d) The Yes scenario is continued record-strong El Niño-related wind shear suppressing intensification through the rapidly shrinking late-season window. I anchor near Polymarket's 61% Yes price but reduce it to 59% because CSU researcher Phil Klotzbach estimated approximately 50% odds of a hurricane-free season and forecasters identify a plausible early-October Gulf development pathway, while the NHC lull and persistent hostile environment keep Yes modestly favored.
4. Final plain mean of 5 draws
57% (59% confidence)
Yes: 57% No: 43%
Mean of 5 draws (0.57, 0.56, 0.57, 0.57, 0.59). (0) Not resolved. The NHC homepage and dashboard for Oct 1 show no Atlantic cyclones and no Atlantic hurricane all season; Fay peaked at 70 mph, just under the 74 mph threshold. YES still needs the basin to stay below hurricane strength on every NHC advisory through Nov 30. (a) About 61 days remain, covering October and November, with the first week already forecast quiet by NHC's 7-day outlook. (b) If nothing changes, YES: the record-strong El Niño shear is forecast by CPC to persist or strengthen (75% chance of a historic event for OND), and Fox Weather's Norcross expects the environment to stay hostile. (c) NO scenario: the southern Gulf development signal that Lowry and Arman flag for about 8 days out, fed by record-warm Gulf water and Eastern Pacific moisture, briefly spins up into a Cat 1 before shear arrives. Alternatively, a late-October or November subtropical or high-latitude system reaches 74 mph, which only takes one brief advisory. (d) YES scenario: shear keeps tearing apart every disturbance, like Fay, Gonzalo and Hanna, and the season ends with zero hurricanes, as in 1907 and 1914. The market sits at 61% after a sharp rally, while CSU's Klotzbach puts a shutout at about 50%. Historical strong El Niño years split roughly evenly on whether they produced October–November hurricanes: 1982 and 1997 did not, 2015 and 2009 did. This year's suppression is more extreme than those, and the first week of October is effectively locked in. I land slightly below the market at about 57%, giving weight to the concrete Gulf signal and the low one-storm bar.
Pipeline Timing
Total pipeline time: 78.2s
Per-tool research timings shown in the Research section above.