A naturally occurring climate pattern that can influence weather across the globe is returning, with forecasters warning it could bring more extreme conditions over the coming year.
El Niño develops every few years in the Pacific Ocean. Under normal conditions, strong trade winds push warm surface waters towards Asia. But during an El Niño event, those winds weaken, allowing warm water to spread back towards South America.
ITV News Science Correspondent Martin Stew explains along with our weather presenter Alex Beresford.
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