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A 'Super El Niño' is when ocean temperatures, the anomalies, reach or exceed 2°C. File photo.
An 'unprecedented' El Niño could develop later this year, the country's climate forecasting service says.
Earth Sciences New Zealand (ESNZ) is holding off formally declaring an El Niño event but says that is likely to change within the next few weeks.
Chief weather scientist Chris Brandolino said the conditions developing in the tropical Pacific Ocean had all the makings of one of the strongest El Niños on record.
