The ocean has done this remarkable about-face and transition.
The Pacific Ocean has pivoted with unusual speed from La Niña's cool grip toward what may be the most powerful El Niño in recorded history, prompting New Zealand's climate scientists to issue a measured but serious warning. Ocean temperatures in the central Pacific have swung nearly two degrees in six months, with models projecting anomalies that could surpass every major El Niño event of the past half-century. For a country whose eastern and Canterbury regions are already in drought, the convergence of a record-strength climate pattern and depleted soil moisture reserves places certain communities in a position of genuine vulnerability — even as scientists caution that atmospheric complexity means local impacts are never simply read off global numbers.
- Ocean temperatures in the central Pacific have reversed course so sharply and so quickly that forecasters are describing it as a 'remarkable about-face' — the kind of pivot the Pacific rarely makes without pausing at neutral.
- Multiple major meteorological agencies — Australia, Japan, and the United States — have already declared El Niño conditions, and New Zealand's own declaration is expected within weeks, signalling that the global scientific community is aligned on the severity of what is forming.
- Canterbury and the eastern South Island are already in meteorological drought with little soil moisture left to absorb further drying, leaving them exposed at precisely the moment a drier, windier pattern is forecast to take hold.
- Scientists are careful to separate the strength of the event from the certainty of its local impacts — a Super El Niño does not automatically translate into a catastrophic New Zealand summer, but the risk profile is elevated in ways that demand preparation now.
The Pacific Ocean has made a dramatic turn. In the space of six months it has swung from the cool phase of La Niña to the warming threshold of what New Zealand's climate forecasters believe could be one of the strongest El Niño events ever recorded. Chris Brandolino, chief weather scientist at Earth Sciences New Zealand, described the shift in measured but unmistakable terms: the conditions forming in the tropical Pacific have all the hallmarks of an event that may exceed even the most intense El Niños of the past fifty years.
The numbers are striking. In January, central Pacific ocean temperatures sat roughly a degree below their long-term average. By mid-year they had climbed to 0.7 degrees above — and some models now project a surge to 3 degrees above average, well into Super El Niño territory. The five strongest events on modern record all saw anomalies reach or exceed 2 degrees. This one is forecast to comfortably surpass that threshold.
New Zealand has not yet made its formal declaration, though Brandolino signalled one is likely within weeks. Australia, Japan, and the United States have already done so, each applying slightly different regional criteria to the same underlying data. What matters is the convergence: the Pacific is shifting, and New Zealand sits in its path.
The typical El Niño pattern brings wet weather to the southwest of the South Island while leaving most other regions drier and windier, raising drought and wildfire risk across much of the country. Brandolino offered an important caveat, however: the strength of an El Niño does not automatically guarantee the severity of its local effects. Other atmospheric factors will shape what New Zealand actually experiences.
Still, certain regions face real vulnerability. Canterbury is already in meteorological drought, and the eastern South Island lacks the soil moisture reserves that might buffer drier months ahead. Brandolino described these areas as already on the back foot. Parts of the North Island that received heavy rain during the La Niña phase may find themselves drying out as the pattern flips — a reversal that could catch people off guard.
The speed of this transition is itself unusual. The Pacific rarely skips from one phase to another so quickly, yet this time it simply cruised past neutral. As forecasters refine their models, the country's driest regions are bracing for what may be an intensely dry year ahead.
The Pacific Ocean has made a dramatic turn. In the space of six months, it has swung from the cool grip of La Niña to the warming threshold of what New Zealand's climate forecasters now believe could be one of the strongest El Niño events ever recorded. Chris Brandolino, the chief weather scientist at Earth Sciences New Zealand, laid out the stakes in measured but unmistakable terms: the conditions taking shape in the tropical Pacific have all the hallmarks of an event that may exceed even the most intense El Niños of the past fifty years.
The numbers tell the story of this reversal. In January, ocean temperatures in the central Pacific sat about 1 degree Celsius below their long-term average. By mid-year, they had climbed to 0.7 degrees above average—a shift Brandolino described as a "remarkable about-face." Some forecasting models now project temperatures could surge to 3 degrees above average, well into the territory of what meteorologists call a Super El Niño. The five strongest El Niño events on modern record—1972-73, 1982-83, 1992-93, 1997-98, and 2015-16—all saw ocean temperature anomalies reach or exceed 2 degrees. This one is forecast to comfortably surpass that threshold.
Earth Sciences New Zealand has not yet formally declared an El Niño event, but Brandolino signaled that declaration is likely within weeks. Australia's Bureau of Meteorology made its official call in mid-June, joining the Japan Meteorological Agency and the US National Oceanic and Atmospheric Administration, which had both declared El Niño conditions the week prior. The agencies work from the same underlying data but apply different criteria based on their own regional weather patterns, which explains the staggered announcements. What matters is the convergence: the Pacific is shifting, and New Zealand sits in its path.
The typical El Niño pattern brings wet weather to the southwest of the South Island while leaving most other regions—particularly the east and northeast—drier and windier. That setup increases the risk of drought and wildfire across much of the country. But Brandolino offered an important caveat: strength of the El Niño does not automatically guarantee severity of local impacts. "While we're pretty confident we will see something quite extraordinary, potentially unprecedented in terms of El Niño strength, we're not quite so certain that those impacts will follow suit here in New Zealand," he said. Other atmospheric factors will also shape what New Zealand actually experiences.
Yet certain regions face genuine vulnerability. Canterbury, already gripped by meteorological drought, sits on precarious ground. The eastern South Island, similarly parched, lacks the soil moisture reserves that might buffer drier months ahead. Brandolino sounded a particular warning for these areas: they are, as he put it, "already on the back foot." Parts of the North Island that received substantial rain during the La Niña phase earlier in the year may find themselves drying out as the pattern flips—a reversal that could catch people off guard. The upper and eastern North Island may have enough residual ground moisture to weather the transition, but the eastern South Island has no such cushion.
The speed of this transition is itself unusual. The Pacific does not typically skip from one phase to another; it often lingers in neutral conditions for months or years. This time, Brandolino noted, it "just cruised by neutral." The ocean's pivot from below-average to above-average temperatures in half a year underscores how rapidly large-scale climate patterns can shift. As New Zealand's forecasters watch the models and refine their predictions, the country's driest regions are bracing for what may be an intensely dry year ahead.
Notable Quotes
It is distinctly possible that this El Niño may comfortably exceed the previously high-end El Niño event.— Chris Brandolino, Earth Sciences New Zealand
While we're pretty confident we will see something quite extraordinary, potentially unprecedented in terms of El Niño strength, we're not quite so certain that those impacts will follow suit here in New Zealand.— Chris Brandolino, Earth Sciences New Zealand
The Hearth Conversation Another angle on the story
When you say this could exceed the strongest El Niños on record, what does that actually mean for someone living in, say, Christchurch?
It means the pattern that typically brings dry conditions to the east could be more pronounced and longer-lasting than anything in the past fifty years. Canterbury is already in drought, so you're not starting from a position of strength.
But Brandolino seemed to hedge—he said the El Niño strength doesn't guarantee the impacts will follow. Why the uncertainty?
Because El Niño is one player in a much larger game. Other atmospheric systems can dampen or amplify its effects. You can have a very strong El Niño that doesn't hit your region as hard as expected, or a moderate one that does. The forecasters are being honest about the limits of what they can predict.
So what's the real risk for the South Island?
The eastern side is already dry. If this El Niño develops as forecast, you're looking at a region with very little soil moisture buffer facing months of potentially drier-than-normal conditions. That's when you get serious drought, water restrictions, and fire risk.
How unusual is this rapid swing from La Niña to El Niño?
Quite unusual. The Pacific typically doesn't move that fast between phases. The fact that it skipped over neutral and went straight from cool to warming in six months is part of what's making forecasters use words like "unprecedented."