Modoki El Niño: The Central Pacific Variant and Why It Matters for Global Weather

Published: June 3, 2026 · 10 min read

You probably know El Niño as the warm phase of ENSO that shifts global weather patterns. But here's the thing — not all El Niños are the same. The classic El Niño (sometimes called "Eastern Pacific" or "Canonical" El Niño) warms the eastern Pacific near Peru and Ecuador. Modoki El Niño — Japanese for "similar but different" — warms the central Pacific instead. Honestly, even climate scientists still disagree on exactly how to define it, and the concept itself was only proposed in 2007 by scientists at the University of Tokyo and JAMSTEC.

That distinction matters a lot more than most people realize. Move the warm water 5,000 kilometers west, and the atmospheric response flips entirely. A Modoki event can give Australia drought while a classic El Niño floods it. It can cool the US Southeast while a classic event warms it. Same ENSO phase, completely different outcomes.

What Makes Modoki Different

The core difference is where the warm sea surface temperature (SST) anomaly sits. In a classic El Niño, the warmest water concentrates in the eastern Pacific — the Niño 1+2 region off the coast of South America. In a Modoki El Niño, the warm anomaly sits in the central Pacific around the date line, flanked by cooler-than-normal water in both the far east and the far west.

This shifts the convective heating — the thunderstorms that drive the atmospheric response — westward by thousands of kilometers. And because the atmosphere responds to where the heat is, the teleconnections (the long-range weather impacts) shift too.

Scientists use the El Niño Modoki Index (EMI) to identify these events, which compares SSTs in three regions: central Pacific minus the average of eastern and western Pacific. If the central region is anomalously warm while east and west are cool, that's Modoki. But honestly, there's still debate about whether Modoki is truly a distinct phenomenon or just one end of a spectrum. The 2007 Ashok et al. paper that coined the term sparked a controversy that hasn't fully settled.

How Modoki Flips the Global Impact Map

This is where it gets interesting. The same El Niño phase produces almost opposite effects depending on whether it's Modoki or classic.

North America

Classic El Niño: wetter in California, warmer in the northern US and Canada, cooler and wetter in the southern US. Classic Modoki: drier in California, warmer in the southeastern US, and colder in the Pacific Northwest. For the 2023-24 event which had mixed Modoki-classic characteristics, California saw Tropical Storm Hilary but also had a relatively dry winter in the north — a hybrid pattern that confused forecasters.

Japan and East Asia

Classic El Niño: tends to bring mild winters to Japan. Modoki: colder winters with more snowfall. The 2009-10 Modoki contributed to one of the coldest winters Japan had in decades. The rice crop took a hit that year because of unusual cold damage in a season that should have been mild.

Australia

Classic El Niño: widespread drought across eastern Australia, higher fire risk. Modoki: the drought shifts to the northwest, while eastern Australia can actually get above-average rainfall. That's why during some declared El Niño years, parts of Queensland have decent farming seasons while the rest of the country is dry. The Bureau of Meteorology does account for this, but their public communications still tend to simplify to "El Niño = dry for eastern Australia."

India Monsoon

Both types tend to weaken the monsoon, but Modoki does it differently — the suppression shifts from the western to the central parts of India. This means different farming regions get hit depending on the event type.

Identifying Modoki: Nino 3.4 vs Nino 4

The simplest diagnostic: compare the Niño 3.4 region (170°W–120°W) with Niño 4 (160°E–150°W). In a classic El Niño, Niño 3.4 shows the strongest anomaly. In a Modoki, Niño 4 is the hotspot, and the anomaly gradient slopes from warm in the center to cooler on both flanks.

If you see an El Niño with Niño 3.4 index barely positive but Niño 4 spiking — that's a Modoki signal. The 1994-95, 2002-03, 2004-05, 2009-10, and arguably 2018-19 events all showed Modoki characteristics to varying degrees.

The 2009-10 Modoki is probably the most studied example. It wasn't particularly strong in terms of peak Niño 3.4 values (+1.6°C), but it caused some extreme regional impacts — the Philippines had one of their driest seasons on record, Kenya had torrential rains that triggered landslides, and the US Midwest had a record warm December.

What About 2026?

The subsurface Kelvin waves we're seeing in 2026 are tracking east, which suggests a classic EP-type event is more likely than a Modoki. But honestly, the atmosphere-ocean coupling hasn't fully established yet. If the stronger atmospheric response stays anchored over the central Pacific rather than propagating eastward, we could see a hybrid or Modoki-like pattern develop. The ECMWF forecasts show considerable spread on this question.

Most ensemble members lean toward a classic event based on the subsurface heat distribution. But a few high-resolution models suggest a central-Pacific-centric warming that would shift impacts westward. We probably won't know until July or August, when the spring predictability barrier clears.

The bottom line: Modoki matters because it proves that El Niño isn't a single thing. Same phase, different location of the anomaly, and you get completely opposite weather outcomes in some regions. If you're reading seasonal forecasts this year, pay attention not just to whether an El Niño is happening, but to where the warm water is centered.

Further Reading

• 2026 El Niño Watch — current data and forecasts
• 2023-2024 El Niño review — what happened last time
• Indian Ocean Dipole — ENSO's partner in climate variability

References: Ashok, K. et al. "El Niño Modoki and its possible teleconnection" (JGR, 2007); Takahashi, K. et al. "ENSO regimes: Reinterpreting the canonical and Modoki El Niño" (GRL, 2011); Wang, C. & Wang, X. "Classifying El Niño Modoki I and II by different impacts on rainfall" (JCLI, 2013); NOAA CPC ENSO diagnostics archive; BOM Australia ENSO outlooks; JMA ENSO monitoring reports.