On 11 June 2026, in the same week the monsoon was limping through its weakest opening in seventeen years, the United States’ National Oceanic and Atmospheric Administration issued the bulletin that India’s forecasters had been watching for since spring: El Niño had formed. Not a probability any longer. A declaration, on the record, from the agency whose Pacific monitoring network is the closest thing the world has to a single trusted referee for this phenomenon.
Four centuries earlier, and several thousand kilometres from any meteorological instrument, fishermen off the coast of Peru had already named the thing NOAA was now confirming. In most years, the cold, nutrient-rich Humboldt Current fills their nets close to shore. But in certain years — and nobody in those centuries could say why, only that it recurred — a tongue of warm, comparatively barren water slides down the coast around Christmas, and the anchovies vanish with it. The fishermen called their unwelcome visitor El Niño: the little boy, the Christ child, arriving each time near his own feast day. They could not have known that the warmth emptying their nets sat at one end of a vast atmospheric see-saw whose other end hangs directly over the Indian subcontinent.
That see-saw has a name — the Walker circulation — and it is a loop of moving air roughly ten thousand kilometres long. In an ordinary year, steady trade winds pile the sun-warmed surface water of the Pacific into a vast, deep pool near Indonesia, the warmest expanse of open ocean on Earth. Air rises above that pool in towering columns of rain-bearing cloud, travels east at high altitude, and sinks back down over the comparatively cold water off South America, closing the loop. India’s relevance to this entire system lies simply in its address: the subcontinent sits immediately beside the loop’s rising arm, and the same great convective updraught that douses Sumatra and Java in rain also feeds the moisture and instability that the Indian monsoon depends on to sustain itself. El Niño is what happens when the trade winds that normally maintain this arrangement falter, and the warm pool of water sloshes eastward across the Pacific basin. The rising arm of the circulation migrates with it — and South Asia finds itself sitting, for a season, beneath the loop’s sinking half instead of its rising one: a lid of dry, descending air pressed down directly on top of the monsoon’s engine. A warm eastern Pacific does not, in any literal sense, steal India’s rain. It stands on India’s chimney and holds the flue shut.
Asked to walk through this mechanism directly for this cover story, Prof. Ashok did not soften the scale of what is developing this year. “This is not a typical or canonical El Niño,” he said. “It appears to be developing into a very large event — its strength is already quite significant.” The anomaly, he explained, runs in both directions across the Pacific basin at once: unusually warm water in the east, unusually cool water in the west — precisely the reverse of the normal arrangement, in which easterly trade winds pile warm water into the western Pacific and drive the cold upwelling off Peru that once fed those fishermen’s nets. NOAA’s own outlook puts the probability of this event reaching “very strong” intensity by the October–December window at 81 per cent, with some model projections approaching a level last seen — in reconstructed form, since the instrumental record only extends back to 1950 — during the exceptional event of 1877–78.
This is also the point in the story where an earlier, widely repeated assumption in this magazine’s own research needs a public correction, because the record deserves better than a comfortable error left standing. Earlier drafts of this cover package, following a loose reading of IMD’s seasonal language, described this El Niño as “peaking” in September — precisely, the reasoning went, when the kharif crop passes through its most water-sensitive growth stage. Prof. Ashok corrected this directly and immediately when the question was put to him:
“El Niños typically peak not in September but around December.” — Prof. K. Ashok, University of Hyderabad
A detail so central to the phenomenon’s name and history that it explains the very naming Peru’s fishermen gave it, timed as it was to the Christmas season. The accurate account, and the one this package now carries throughout, is that this El Niño is already strong and still strengthening through the kharif season, with its conventional peak arriving only after harvest, in the winter months — meaning the crop faces not a single dramatic crest of pressure in September, but a steadily mounting one across the whole growing season. The honesty this story owes its readers extends further. The El Niño–monsoon link is a probability, not a physical law with no exceptions. Since 1951, roughly six years in ten with an El Niño present have brought India below-average rainfall — which means four years in ten did not. The reason lies in a second ocean entirely, and a second wind pattern this package will turn to next: the Indian Ocean’s own internal see-saw, which in some years has been strong enough to overrule the Pacific completely, and in this year — with El Niño already strong and strengthening — is forecast to offer no such rescue at all.
– K Ravi Kamaraj
