Asia’s climate bill is coming due. Western markets are on the hook.

NOAA’s Climate Prediction Center adopted the Relative Oceanic Niño Index as its official El Niño monitoring standard on February 1, 2026. Even under this metric — which strips out background ocean warming — the agency projects a 69% probability that the 2026 event will reach a historic threshold of +2.5°C by year’s end, exceeding all El Niños since 1950.

The conventional Niño 3.4 index already hit a record +2.6°C for this stage. The 1.2°C gap between the two readings raises a question the forecasts cannot answer: does the new yardstick clarify the danger, or obscure it?

NOAA’s adoption of a new yardstick for El Niño has recast historical rankings of extreme Pacific events. The Relative Oceanic Niño Index, or RONI, adopted in February 2026, subtracts the tropical ocean’s average warming from the central Pacific anomaly. The current event registers +2.6°C on the old scale, but only +1.4°C on the new one. The gap is not a difference in the ocean’s heat; it is a difference in the baseline.

Even so, NOAA’s August 13 Diagnostic Discussion gave a 69% probability that the October–December season will reach the RONI historic threshold of +2.5°C. The recalibration recasts the past: the 1982–83 El Niño would now reclaim the top spot that the 2015–16 event held under the old index. The 1997–98 super El Niño, a benchmark for a generation, peaked at +2.4°C on the RONI scale. The question is not whether this event is strong. It is whether the index meant to bring clarity is, instead, making the yardstick itself part of the story.

A 1.2°C gap that rewrites history

The Niño 3.4 sea-surface temperature anomaly for the week centered August 26, 2026 was the highest on record for this stage of any post-1950 El Niño, NOAA’s Climate Prediction Center confirmed. NOAA’s August 13 Diagnostic Discussion assigned a 69% probability that the October–December season will reach the RONI historic threshold of +2.5°C or higher, marking the first official forecast using the new index. The 15‑member ensemble of the International Research Institute for Climate and Society at Columbia University projects anomalies reaching or exceeding +3.0°C, a level the institute called “truly off the charts.”

The subsurface heat reservoir is what makes the forecast credible. NOAA reported that ocean temperatures at 50–150 meters depth exceeded climatological values by more than 8°C across broad areas of the central‑to‑eastern equatorial Pacific, with localized readings 10°C above normal near 100 meters. The Walker Circulation — the atmospheric loop that normally drives trade winds westward — has broken down, unleashing westerly wind anomalies that pushed warm water eastward and suppressed the upwelling of cooler, nutrient‑rich water.

For a farmer in Central Java, the probability of a drier‑than‑normal season is not a model output. It is a question of whether the irrigation canals will run dry before the harvest. Indonesia’s BMKG expects the 2026 dry season to be drier and longer than normal, with El Niño likely persisting into early 2027 and a 62% chance of strong intensity. Several provinces, including Kalimantan, Papua, and Java, face an elevated probability of drier September–November conditions than even the severe 1997 El Niño produced. A positive Indian Ocean Dipole is forecast to develop between September and December, amplifying the drying effect.

The immediate consequence is already visible in Peru. The first‑season 2026 anchovy quota was set at 1.9 million metric tons, the lowest in a decade and a 36% decline from the prior year. By June, only about 469,000 metric tons had been harvested — roughly a quarter of the allowance — before authorities suspended operations multiple times to protect juvenile fish. The quota reduction, advised by the Peruvian Institute of the Sea (IMARPE) to preserve spawning biomass, ripples directly into global fishmeal markets.

“This exceptional El Niño demands exceptional preparation and response,” said Celeste Saulo, Secretary‑General of the World Meteorological Organization. The WMO’s September 3 seasonal update, drawing on an ensemble of global producing centres, described the forecast agreement as “unequivocal” and assigned a near‑100% likelihood that El Niño will persist through February 2027.

The precise peak intensity remains uncertain. NOAA meteorologists have emphasized that El Niño is one of the strongest sources of seasonal climate predictability. But the range of outcomes for the RONI value is wider than for the conventional index, and the 69% probability is based on a suite of models that still differ on the magnitude of relative warming.

The new index is a scientific correction, but it also recasts what counts as unprecedented, and the difference is not merely academic. The 2015–16 event, which held the modern peak under the fixed baseline, would be displaced by 1982–83 under RONI. The 1997–98 super El Niño peaked at +2.4°C on the RONI scale, and the 2026 event is tracking ahead of both even after correction.

The sequence below traces the key milestones from NOAA’s index change to the projected peak.

The Western footprint the ocean carries

Global ocean surface temperatures are already at record levels. NOAA’s analysis showed July 2026 as the warmest July on record for the oceans, with the global average about 1.02°C above the 20th‑century norm. Copernicus data indicated daily global sea‑surface temperatures hit a new record near 21.1°C in late August as El Niño strengthened. The phenomenon is not adding heat to a cool system; it is amplifying a baseline that is already historically warm.

Western demand for Peruvian fishmeal — driven by intensive livestock and aquaculture feed markets in Europe and North America — may amplify pressure on anchovy stocks already stressed by reduced upwelling. According to market‑monitoring reports, global fishmeal prices have surged above USD 3,100 per ton by mid‑2026. Western producers maintaining high‑protein feed formulations keep fishing effort elevated despite climate‑driven ecosystem strain.

Indonesia’s Ministry of Agriculture activated emergency mitigation protocols well ahead of the peak, shifting focus from standard seasonal support to protecting vulnerable irrigation networks. ASEAN’s Specialised Meteorological Centre activated its highest Level 3 haze alert, triggering daily situation reports and cross‑border coordination under the ASEAN Agreement on Transboundary Haze Pollution. The next NOAA ENSO Diagnostic Discussion, due September 10, may raise the historic probability further. Or it may not. Either way, the index that was supposed to clarify the picture has instead made the stakes of the answer more visible.

Beyond the headline

The Bigger Picture

The 2026 El Niño is exposing how a warming baseline reshapes what record strength really means. NOAA’s shift to RONI redefines historical rankings so that current events can be compared to cooler decades. This methodological change has raised concerns among some analysts about whether it may confuse policymakers and the public about whether today’s extremes reflect natural variability or accumulated climate forcing. The deeper story is how index design shapes climate‑risk narratives and, ultimately, resource‑allocation decisions.

The Science Gap

Scientific agencies broadly agree that El Niño is very strong and likely to persist into 2027, but they diverge on how best to separate its internal dynamics from background ocean warming. RONI offers one solution, yet many regional outlooks and media reports still rely on conventional fixed‑baseline indices, creating mixed signals about what counts as unprecedented. Until comparative studies clarify how different metrics map onto real‑world impacts, decision‑makers are operating with partially incompatible gauges of the same phenomenon.

The Reach

One under‑examined actor is the global marine‑ingredients industry, which hinges on Peruvian anchovy catches that El Niño can rapidly destabilize. When quotas fall and fishmeal prices spike, large Western feed producers adjust formulations and sourcing strategies that ripple into livestock costs, aquaculture expansion, and even deforestation incentives in other regions. This event therefore reaches into Western food systems not only through weather disruptions but through the commodity logic that turns vulnerable fisheries into price signals across global supply chains.

Three decisions for the months ahead

With model consensus pointing to a peak between November 2026 and February 2027, and impacts already materializing, the window for preparation is narrowing.

• US Gulf Coast Property Owner

  NOAA seasonal outlooks project elevated flood risk along the Gulf Coast and Eastern Seaboard through spring 2027. Review your flood insurance coverage now — standard homeowner policies do not cover flood damage — and consult FEMA’s National Flood Insurance Program for policy details. Check local emergency management plans and assemble a go‑bag with essentials, as heavy rainfall events can develop rapidly.

• Western Aquaculture or Livestock Feed Producer

  Peruvian fishmeal prices have surged past USD 3,100 per ton, and the quota reduction points to sustained tight supply. Re‑evaluate sourcing strategies now by exploring alternative protein sources such as algal or insect‑based meals, and stress‑test your pricing models for a scenario in which super‑prime fishmeal remains above USD 3,000 through mid‑2027. Monitor FAO’s international price monitoring for the latest market data.

• European or North American Investor with Southeast Asia Exposure

  Indonesian drought risk, amplified by a positive Indian Ocean Dipole, threatens agricultural yields, water‑dependent manufacturing, and regional supply chains. Assess the climate resilience of portfolio companies — particularly those in palm oil, rubber, and textiles — and request contingency plans for water scarcity and haze‑related disruptions. Track BMKG’s climate outlooks and ASEAN’s haze alert updates for forward signals.

• Western Traveler Planning Southeast Asia Trips

  Transboundary haze from Indonesian fires can reach hazardous levels, affecting visibility and respiratory health. Before traveling, check air‑quality indices for your destination via IQAir or local governmental portals, and pack N95 masks. If conditions deteriorate, reschedule or reroute; many travel insurance policies exclude cancellations due to haze unless a government advisory is issued, so monitor official travel warnings from your home country.

Explainer

El Niño

El Niño is a periodic warming of the central and eastern equatorial Pacific that disrupts global weather patterns. The phenomenon was named by Peruvian fishermen who noticed the warm water around Christmas, referring to the Christ child. It is the warm phase of the El Niño–Southern Oscillation, with the cool phase called La Niña.

RONI

The Relative Oceanic Niño Index measures the Niño 3.4 anomaly relative to the entire tropical ocean, removing the effect of background warming. NOAA adopted it as its official ENSO monitoring standard on February 1, 2026, to improve comparability across decades. Under RONI, the 1982–83 El Niño would rank as the strongest on record, displacing the 2015–16 event.

Niño 3.4

The Niño 3.4 index is the most widely used measure of El Niño strength, based on sea surface temperature anomalies in a rectangle from 5°N to 5°S and 120°W to 170°W. A sustained anomaly of +0.5°C marks El Niño conditions; +2.0°C defines a “very strong” event. The 2026 event reached a weekly anomaly of +2.6°C in late August, the highest for that stage since 1950.

Walker Circulation

The Walker Circulation is a vast atmospheric loop of rising air over the warm western Pacific and sinking air over the cooler eastern Pacific, driving trade winds westward. It was named for Sir Gilbert Walker, the British meteorologist who identified the pressure pattern in the 1920s. Its breakdown during El Niño allows warm water to slosh eastward, amplifying the warming.

Indian Ocean Dipole

The Indian Ocean Dipole is a climate pattern in which the western Indian Ocean becomes warmer than the eastern part, influencing rainfall across the region. A positive phase, forecast for late 2026, typically brings drier conditions to Indonesia and Australia and wetter conditions to East Africa. When it coincides with El Niño, it can amplify drought and fire risk across the Indonesian archipelago.

BMKG

BMKG is Indonesia’s Meteorology, Climatology, and Geophysical Agency, responsible for weather and climate monitoring. It issues seasonal forecasts, drought warnings, and wildfire‑prevention guidance. During the 2026 El Niño, BMKG predicted a 62% chance of strong intensity and advised water‑availability measures across multiple islands.