Thomas Lamb  ·  June 26, 2026  ·  Convergence Series Update

The Data Void:
Why Ocean Models Cannot See What Is Coming — And What That Means for the La Niña Forecast

From the NGM era of the 1980s to the ECMWF of 2026 — the same structural failure, the same systematic bias, and the same consequence: models that cannot see the subsurface cannot forecast what the ocean will do next. The La Niña projection for 2027 is built on a void.

The NGM Pattern — A Forecaster's Perspective

I began my meteorological career in the era of the Nested Grid Model. The NGM was state of the art operational guidance in the 1980s — sophisticated physics, careful construction, the best tool available. And it failed systematically in the same direction whenever the observational input was inadequate. Not randomly wrong. Consistently wrong. Always in the same direction. Because the model could only forecast what it could see — and what it could not see, it could not forecast.

Experienced forecasters learned to read the gaps. Ship synoptic reports were sparse across the open ocean. Radiosonde coverage was uneven. When a major cyclogenesis event was loading over a data-sparse region, the NGM would underperform consistently — and the skilled forecaster would add what the model couldn't see, applying meteorological instinct built from pattern recognition that the model had not yet developed.

The pattern I am describing in 2026 is structurally identical. The model has changed — the ECMWF is the NGM's vastly more sophisticated descendant. But the fundamental dependency is the same: observations in, physics applied, forecast out. Degrade the observations and the forecast degrades regardless of how good the physics is. The Argo float network is the ocean's radiosonde network — vertical profiles through the water column rather than atmospheric soundings, but the same foundational role. Real-time subsurface data initialising the model so it knows what is actually in the ocean before it tries to forecast what will happen next.

The Argo network is degrading. I documented this in detail on June 26 — US funding cuts reducing float replacement below attrition rates, biogeochemical Argo ending, Southern Ocean coverage thinning, the Kerguelen Plateau region where Big Ben has been erupting for 14 years having one monitoring instrument that last reported in 1992. The subsurface data feeding the ECMWF and every other operational model is less complete than it should be at the moment it is needed most.

The consequence is now visible and confirmed. On June 27, meteorologist David Schlotthauer noted that even the ECMWF has been underestimating this El Niño — and forecasts for July are expected to come in higher still. Eric Webb noted that the ECMWF seasonal forecast dismissed by many for its warm bias actually underestimated reality. The best model on Earth, revised upward at every cycle, still behind the observations.

This is not random error. This is a systematic observational gap expressing as a consistent bias — exactly the NGM pattern I recognised forty years ago. When a model is consistently wrong in the same direction, the answer is not in the physics. It is in what the model cannot see.

What the model cannot see is the subsurface heat. The second Kelvin wave loading near Indonesia — visible on the NOAA CPC equatorial upper ocean heat chart — is a subsurface signal propagating through the water column. Without adequate Argo coverage in the western Pacific initialising the model correctly, that heat reservoir is underrepresented in the model state. The model forecasts less El Niño than is actually developing. It gets revised higher every cycle because the observations keep showing more than the model expected.

The La Niña projections for 2027 are built on this same underestimated baseline. Models that cannot fully see the subsurface heat loading now will not correctly forecast when that heat dissipates — or whether it dissipates at all. The La Niña forecast is the NGM pattern applied to the Pacific decadal cycle. And my forecaster's instinct, built on forty years of reading what models miss, says the La Niña is not coming when the models expect it.

On June 8 we documented the western Pacific warm pool — fed from below by the most tectonically active convergence zone on Earth — as the heat source for what is now confirmed as a record-onset El Niño. June 2026 anomalies are already exceeding what was observed in June 1997 and June 2015, both years of Super El Niño. The Niño 3.4 index stands at +1.74°C. The eastern Pacific Niño 1+2 region is at +2.97°C — beyond any analog in the modern record at this stage of development.

Today the picture extends further — and my meteorologist's instinct says this is the development that changes the long-range outlook fundamentally.

A Second Kelvin Wave Is Already Loading

NOAA Climate Prediction Center equatorial upper ocean heat data now shows a new warm Kelvin wave generating near Indonesia — the same heat source region identified in the original June 8 framework. This second pulse is loading at source while the first delivery is still at peak in the eastern Pacific. The pipeline is being refilled before it has finished delivering.

The first Kelvin wave — carrying subsurface temperatures 7.5°C above average in parts of the deep ocean — has already arrived at the South American coast, shutting down cold upwelling and driving the record surface anomalies now visible across the equatorial Pacific. A second warm pulse is expected to arrive in the eastern Pacific around August 2026, on top of what is already there.

The Forecast: La Niña May Not Occur — Or Will Be Short-Lived

Climate models are currently projecting a La Niña transition for 2027. My forecast, based on the Kelvin wave picture and the heat source dynamics documented in this series, is that this transition may not occur — or if it does, it will be significantly abbreviated and weaker than models currently indicate.

The mechanism is straightforward. The normal El Niño to La Niña sequence requires:

Eastern Pacific heat dissipates → trade winds reestablish → upwelling Kelvin wave flushes the warm anomaly → western Pacific cool anomaly develops → La Niña locks in.

A second warm Kelvin wave recharging at source before the first has dissipated disrupts this sequence at the first step. The western Pacific warm pool — already being recharged from below by sustained volcanic and hydrothermal activity along the Indonesian and Philippine arc — does not get the recovery window needed. The trade wind reversal that initiates La Niña cannot establish cleanly. The system stays loaded.

What Every Previous Super El Niño Did — And Why 2026 May Be Different

The 1997-98 Super El Niño was followed by one of the strongest La Niña events on record — 1998-99. The 2015-16 event was followed by a moderate La Niña. The pattern has been consistent: the bigger the El Niño, the sharper the rebound cooling.

But those events did not have a second Kelvin wave loading at the Indonesian source region during peak. They did not occur against a background of 14 years of continuous submarine volcanic activity at Heard Island adding heat to the Southern Ocean. They did not begin with onset anomalies that exceeded their own analogs before the event had even peaked.

The question marks that Brazilian meteorologist Bruno Capucin placed on his June 2026 comparison panel — against 1997, 2015, and 2023 — are appropriate. This event is already in territory those analogs do not cover.

The Implications If the Forecast Is Correct

A suppressed or absent La Niña means:

• No relief for drought-affected regions that depend on La Niña rainfall — Australia, Southeast Asia, southern Africa, parts of South America
• Sustained elevated global temperatures through 2027 with no La Niña cooling offset
• Continued suppression of Atlantic hurricane activity followed by potential explosive rebound if the system eventually flips
• Extended stress on food production systems already operating under the fertilizer crisis documented June 8
• The 318 million people in crisis-level hunger before El Niño peaked — facing a second year without La Niña recovery

Alaska — The State That Cannot Afford a Missing La Niña

Of all the regions affected by this forecast, Alaska carries a specific and compounding vulnerability that the standard El Niño impact summaries do not fully capture.

Alaska is the state most directly influenced by El Niño's modification of large-scale Pacific atmospheric circulation. The summer signal is stronger here than anywhere else in the United States — even weak El Niño summers have averaged roughly one degree above normal statewide. The two largest wildfire years in Alaska's recorded history — 2004 and 2015 — both occurred during El Niño summers. A record-strength event in 2026, followed by no La Niña recovery, means Alaska faces back-to-back anomalously warm years with no cooling interval between them.

The Bering Sea and Norton Sound are already expressing the stress. A striking cold SST anomaly is currently concentrated in Norton Sound — not from atmospheric cooling, but from Arctic meltwater routed south through the Bering Strait and trapped by the Sound's semi-enclosed geometry. That cold freshwater pool is sitting against anomalously warm surrounding water. The thermal contrast is sharp. Without La Niña recovery to cool the broader Bering Sea system, that gradient sharpens further — driving more volatile weather along Alaska's western coast and disrupting the marine environment that coastal communities depend on.

The infrastructure implications are direct. Permafrost integrity, river ice timing, coastal access windows, and tailings containment in mining operations are all built on assumptions of periodic cooling cycles. La Niña has historically provided that reset. If the reset does not come in 2027, systems designed for cyclical stress — not compounding continuous warming — face a different kind of load than they were engineered to carry.

Salmon runs, already under pressure from marine heatwaves and shifting prey distribution, depend on Bering Sea temperature recovery between El Niño cycles. Subsistence communities along the Yukon, Kuskokwim, and Norton Sound coast — communities with no economic buffer against failed runs — are in the most direct exposure path of what a suppressed La Niña means on the ground.

Alaska does not experience El Niño and La Niña as abstract climate indices. It experiences them as ice, fire, fish, and ground stability. A missing La Niña is not a statistical anomaly. It is a second consecutive year of the same pressure on systems that were already at their limits.

My meteorological background includes Alaska. I am writing this section not as an abstraction but as a documented forecast with direct human consequences in a region I know. The July checkpoint will bring the first data confirming or challenging the La Niña suppression forecast. Alaska will be watching that data as closely as I will.

On the Record — June 26, 2026

This forecast is documented here on June 26, 2026, ahead of the July checkpoint established in earlier posts in this series. The data that will confirm or deny it is already in motion — the second Kelvin wave is generating now, the eastern Pacific anomalies are already beyond analog, and the La Niña model projections for 2027 will either verify or diverge against what I am forecasting today.

My meteorologist's instinct, built on the framework first published in 2004 and tracked through this convergence series, says the La Niña is not coming when the models expect it — and may not come at all in meaningful form.

The ocean has a furnace underneath it. It is still burning.

THOMAS LAMB  ·  JUNE 26, 2026
CONVERGENCE SERIES — UPDATE IV
RESEARCH ASSISTANCE: CLAUDE, ANTHROPIC