· Analytic
Z4545 NOAA Oceanic Niño Index (Inverted, Publication-Shifted)
The NOAA Oceanic Niño Index with a 60-day publication-aware shift and polarity inversion, so La Niña regimes register as positive signal values. ONI is OFFICIALLY a CENTERED 3-month SST anomaly mean, so the raw NOAA series carries an inherent 2-month look-ahead that this engine’s 2026-10-25 patch removes.
Current reading
-0.894
Moderate Neg
DAILY · SIGNAL
As of Oct 30, 2026. Updated nightly.
Current composite
-0.8937
On the plus-or-minus one scale; ONI DEEPLY POSITIVE → El Niño regime (after inversion → EXTREME_NEG signal)
Signal state
Moderate NEG
82 days in episode; ONI deeply positive, El Niño conditions
All-time percentile
2.3th
Bottom 2 percent of 36 years , historically extreme El Niño reading
EXTREME_NEG corn fwd 60d
-4.69%
1,294 days (14.4% of sample), HAC t -6.74 significant at 1%
EXTREME_POS corn fwd 60d
+4.38%
1,193 days (13.3% of sample), HAC t +3.76 significant at 1%
Current contribution to ML Auto Corn Composite V9
-0.112
Single largest negative contribution; 12.6 percent weight × +1 polarity × -0.894 value
OBJECTIVE
The Oceanic Niño Index is the operational metric used by the NOAA Climate Prediction Center to declare El Niño and La Niña events. It is defined as a 3-month running mean of SST anomalies in the Niño 3.4 region of the equatorial Pacific. Readings above plus 0.5 for five consecutive overlapping 3-month windows are declared El Niño; readings below minus 0.5 for five consecutive windows are La Niña. The index drives global atmospheric circulation patterns that in turn drive US and South American corn growing-season weather. La Niña conditions historically coincide with reduced moisture in the US Corn Belt during late summer (positive for corn via drought stress) and reduced moisture in Argentina’s corn growing region (positive for US corn via reduced competing exports). El Niño conditions historically coincide with the opposite pattern. The signal takes the raw NOAA ONI series, applies a 60-day shift to remove the centered-3-month-mean look-ahead baked into ONI’s official definition, polarity-inverts so La Niña (negative ONI) maps to positive signal, and tanh-clips. The 60-day shift is a 2026-10-25 patch , pre-patch, the raw ONI series was being read on its stamped date even though the stamped date is the CENTER of the 3-month window and the final observation (for month M+1) is not available until end of M+1. Here is the clean empirical pattern across 36 years. EXTREME_POS state (val above plus 0.5, deep La Niña after inversion) delivers mean corn fwd 60d of plus 4.38 percent (HAC Newey-West t plus 3.76, significant at the 1 percent level, 1,193 state-days). EXTREME_NEG state (val below minus 0.5, deep El Niño) delivers minus 4.69 percent (HAC t minus 6.74, significant at the 1 percent level, 1,294 state-days). Both tails are highly significant and directionally consistent with the ENSO-corn mechanism. The signal reads minus 0.8937 as of October 23 2026, in EXTREME_NEG territory (El Niño regime by inversion) at the 2.3 percentile of 36 years of history , a historically extreme reading. The signal contributes 12.6 percent weight to ML Auto Corn Composite V9 ML Auto Corn Composite (second-highest-weight input) with polarity sign plus one. Current contribution to ML Auto Corn Composite V9: minus 0.112, the single largest negative contribution.
LIVE CHART
Thirty-six years of NOAA Oceanic Niño Index, publication-shifted and polarity-inverted.
The signal has been in EXTREME_NEG territory (El Niño conditions after inversion) for 82 consecutive trading days at the 2.3 percentile of 36 years , a historically extreme reading. Signature episodes: EXTREME_NEG firings during the 1997-98 super-El-Niño, the 2015-16 strong El Niño, the 2009-10 moderate El Niño. EXTREME_POS firings during the 2010-12 triple-dip La Niña (coinciding with 2012 drought), the 2020-23 triple-dip La Niña (coinciding with Russia-Ukraine corn stress), and the 1988-89 La Niña (coinciding with historic drought).
COMPOSITE
-0.9 / 100
STATE
Moderate Neg
PHASE
-1
FWD 60d
+1.62% (baseline +2.31%)
SAMPLE N
9,039 days
TODAY’S PLAYBOOK READING
STATE
Moderate Neg
STATE AND PERCENTILE
EXTREME_NEG at the 2.3 percentile of 36 years , historically extreme El Niño reading.
WHY THE SIGNAL IS HERE
Niño 3.4 SSTs are running significantly above climatological norms, consistent with a moderate-to-strong El Niño regime. The 60-day shift means today’s signal value reflects ONI as of approximately August 2026.
POSTURE FOR THE WEEKS AHEAD
EXTREME_NEG historically delivers minus 4.69 percent corn fwd 60d (HAC t minus 6.74 sig at 1 percent). The signal is a leading contrary indicator for corn: El Niño conditions historically associated with Argentine export expansion and Corn Belt moisture surplus.
WHAT THE CHART SHOWS
The composite sits at -0.89 in the deep El Nino Signature band. The 3-month-smoothed, publication-aware ONI confirms the warm equatorial Pacific phase that the faster-moving Z4339 Nino 3.4 signal has been reading. CBOT front-month corn (orange, right axis) sits near $4.48/bu.
TOP INPUTS FIRING
- Primary composite -0.89 State El Nino Signature, deep extreme band. Polarity-inverted: raw ONI is WARM (El Nino), inverted to NEGATIVE composite for bearish-corn interpretation.
- NOAA Oceanic Nino Index, 3-month SST centered mean, 60-day publication shift ONI is the officially-published 3-month-centered mean of Nino 3.4 SST anomaly. The 60-day publication-aware shift avoids look-ahead bias.
- IC vs CBOT corn fwd 60d: Spearman +0.195, p=1.7e-77 (N=8,984) Deeply significant positive IC: positive composite (La Nina) predicts positive corn fwd 60d via US drought-risk mechanism.
THE TAKEAWAY
What this means for you today
WHAT ENSO IS TELLING YOU
The equatorial Pacific is currently in an El Niño regime per the 60-day-shifted ONI series. El Niño coincides with specific atmospheric circulation anomalies that favor increased precipitation in Argentina (expanding South American corn production, bearish for US corn exports) and that reduce late-summer moisture stress in the US Corn Belt. The historical empirical pattern across 36 years confirms the direction: El Niño states have preceded below-baseline corn forward 60-day returns with high statistical significance.
THE 60-DAY PUBLICATION-SHIFT PATCH
NOAA ONI is officially defined as a 3-month CENTERED mean of Niño 3.4 SST anomalies. The ONI value stamped at month M uses SST observations from months M-1, M, and M+1. This means the "June 2026 ONI" cannot be publicly computed until the end of July 2026 (when the July SST observation becomes available), and NOAA’s official declaration lag typically runs through mid-August 2026. The raw NOAA_ONI series in the estate stamps each value at the center month, which creates a systematic 2-month look-ahead if used as-is in a historical backtest. The 2026-10-25 engine patch applies `s.shift(60)` to remove this look-ahead. The current reading of minus 0.8937 reflects the ONI value as of approximately August 2026 , the latest publicly-knowable value as of October 23 2026.
THE HONEST CAVEAT
The signal is partially correlated with Corn La Niña × PDO Amplifier (Publication-Shifted) La Niña × PDO Amplifier (same ONI source, PDO added) and NOAA Niño 3.4 SST Anomaly NOAA Niño 3.4 SST anomaly (raw Niño 3.4 index without the 3-month smoothing). All three are in ML Auto Corn Composite V9 totaling approximately 34 percent of the composite weight on ENSO-related signals. Readers should recognize this as cross-corroborating ENSO reads rather than three independent predictors. The LightGBM composite’s statistical fit heavily reflects this ENSO channel.
THE REGIME MAP
The three Oceanic Nino Index ENSO regime states, forward returns and sample share
Behavior across the NOAA Oceanic Nino Index with 60-day publication-aware shift and polarity inversion (La Nina = positive composite). ONI is the officially-published 3-month-smoothed SST anomaly; this signal applies a 60-day publication shift to avoid look-ahead and preserve honest back-testing. Companion to Z4339 Nino 3.4 (same raw data, no smoothing, faster-moving).
| State | Phase | Share | Fwd 60d | HAC t | Edge vs baseline | Last firings |
|---|---|---|---|---|---|---|
| El Nino Signature TODAY | – | 26.8% (2427 d) | +3.16% | +2.87pp | Jun 2026, Jul 2023, Dec 2019 | |
| ENSO Neutral | 0 | 46.9% (4241 d) | -1.58% | -1.87pp | Mar 2026, Jul 2024, Apr 2023 | |
| La Nina Signature | + | 26.3% (2376 d) | +9.55% | +9.26pp | Dec 2025, Nov 2021, Nov 2020 |
The historical pattern
Methodology
THE TRACK RECORD
State changes
| State | Start | End | Duration | Fwd 60d SPY |
|---|---|---|---|---|
| Normal | 10/23/2024 | 11/28/2025 | 277d | +4.92% |
| Extreme Neg | 12/01/2025 | 02/27/2026 | 61d | +0.84% |
| Normal | 03/02/2026 | 06/29/2026 | 83d | +9.34% |
| Extreme Pos | 06/30/2026 | 10/23/2026 | 82d | +2.73% |
Scroll inside the table for the full history. Forward 60-day SPY is measured from each run’s start date; a reader cannot trade off a start-date they only identify in hindsight, so this is a transparency log, not an alpha claim. Asterisked (*) returns are partial. The run is less than 60 trading days old. The full 60-day comparable fills in as more data arrives.
What this measures
The engine queries NOAA ONI monthly data from the estate weather database (`NOAA_ONI` table). Forward-fills daily. Applies `s.shift(60)` to remove the centered-3-month-mean look-ahead (patch 2026-10-25 per persona code review §6.1). Polarity-inverts: `sig = -s` so negative ONI (La Niña) maps to positive signal. Tanh-clips with `/1.5` divisor to calibrate standardized ONI into plus-or-minus one range. Five-state machine on the final the primary composite.
GO DEEPER
Want the full depth?
The full research brief adds methodology detail on the Oceanic Nino Index construction, the 3-month centered-mean smoothing, and why the 60-day publication-aware shift is critical for honest back-testing. Includes historical case studies anchored to actual ENSO cycles, the three-regime state-conditional table, and the methodology for pairing with the sibling Z4339 Nino 3.4 signal, Silking Pace, Pampas, and the Corn Cycle DNA playbook.
Taxonomy, polarity, state labels
Not investment advice · The analysis on this page is informational and educational. Signal readings, historical case figures, and empirical statistics are derived from publicly available data and are provided without warranty. Hypothetical performance results have inherent limitations, including the benefit of hindsight. Readers who intend to trade should consult a licensed investment professional and see the research brief for the full disclaimer.
Last refreshed Nov 02, 2026 12:28 PM ET