ManifoldPlay moneyAI / TechDevelopingUpdated 8m ago

Will this El Niño be the strongest ever recorded?

As of Oct 17, 2026, 5:49 PM ET, Manifold priced this market at 66.2% (up from 63.2% 24 hours earlier). It had 28.9 mana traded in the past 24 hours and 200 mana of pool liquidity. probcast.co rates the support behind this price as moderate.

Market probability
66.2%
+3 percentage points
over 24 hours63.2% → 66.2%

Play-money market (mana, not dollars) — thin market where small orders can move the price — and today's move was spread across many accounts.

Price historyManifold

Source: Manifold price history

How credible was the move?

Methodology →

Move validity

Moderate

Consensus stability

Forming

Contract clarity

High

Can you trust this price?

Two different questions: how hard the price is to move, and whose trading set it.

Market capacity

How hard is it to move this price?

Thin

Pool liquidity

200 mana

Bid-ask spread

n/a

automated market maker

24h volume

28.9 mana

Total volume

1K mana

Play money: depth is in mana, so it says nothing about real-money conviction.

Who's trading

Whose opinion is this price?

Broad participation
22%of the traded money came from the single largest account

Accounts

29

Trades

81

over 95 days

Largest order

200 mana

982.1 mana traded across these 81 trades (last 95 days).

Many independent accounts traded — the price reflects a crowd, not one trader.

Recent trade activity$982.1 traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

EDIT: The original resolution criteria incorrectly states that the strongest El Niño ever had a three-month mean RONI of +2.69°C. According to the resolution source, the record is actually +2.4°C.

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

EDIT: The original resolution criteria incorrectly states that the strongest El Niño ever had a three-month mean RONI of +2.69°C. According to the resolution source, the record is actually +2.4°C. However, for fairness purposes I will NOT be changing the original resolution Criteria. This market will resolve to YES if the RONI value from the source below reaches +2.7°C or higher. If the peak RONI value from the source below never reaches or exceeds the above value (+2.7°C), this market will resolve to NO. https://cpc.ncep.noaa.gov/products/analysis_monitoring/enso/roni/ Resolution criteria This market resolves to YES if the following condition is met for any three-month running mean season during the El Niño event peaking in late 2026 or early 2027: The official Relative Oceanic Niño Index (RONI) reaches +2.70°C or higher (strictly exceeding the historical record of +2.69°C set during the 1982-1983 winter). If the RONI value stays at or below +2.69°C, this market resolves to NO. Data Sources for Verification: NOAA CPC Relative Oceanic Niño Index (RONI) Dataset If subsequent NOAA revisions modify the peak values of the 2026–2027 event, resolution will be determined by the official NOAA data available as of June 1, 2027. Background A historically powerful El Niño is developing in the tropical Pacific, with multiple forecast models projecting a "super" or "mega" El Niño. Historically, the strength of ENSO events has been measured by the Oceanic Niño Index (ONI), which tracks sea surface temperature anomalies in the Niño 3.4 region. Under this metric, the 2015–2016 winter holds the record at +2.6°C. However, to correct for background global ocean warming, the CPC transitioned in 2026 to the Relative Oceanic Niño Index (RONI) as its primary ENSO tracking tool. RONI subtracts the global tropical-mean sea surface temperature anomaly to isolate the true ENSO signal, and under this index, the 1982–1983 event holds the record at +2.69°C. This description was generated by AI. Review and verify everything here yourself. You can edit, replace, or delete any part of this description, including the resolution criteria. You do not need to trust the AI output.

Why the odds moved

The probability rose 3.0 percentage points over the last 24 hours (63.2% → 66.2%).

No verified catalyst has been linked to this move yet. ProbCast does not attribute moves to news without evidence connecting the timing of a specific report to the repricing.

What could move this market next?

  • The market's deadline arrivesJune 1, 2027 at 7:59 PM ET

    The contract must resolve based on what has happened by this date.

Derived from the contract's own mechanics as of Oct 17, 5:58 PM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: low · expected error ±22 pts.

Reacting to newsLegacy movement classifier: watch

What's happening

medium classifier confidence
Reacting to news

The price is actively repricing on real volume. The number is still moving — don't treat the latest print as settled consensus yet.

  • Probability moved 3.0 pts in ≤6h on adequate liquidity
  • Flow one-directional across 29 participants (broad, not a single order)

Read the latest price with caution; conditions make it an unreliable summary right now.

More details — reliability score, dynamics, durability
Reliability score
20Low
Where the price path tends to go next560 observed
  • Illiquid / quiet98%
  • Choppy / mean-reverting1%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~21h
PredictabilityStable

Secondary read: leaning toward Thin market.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Change (pts)1H0.06H+3.024H+3.07D+3.0

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