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LONDON: This year’s El Nino weather pattern will be the biggest in over a century and could make 2027 the hottest year globally, Britain’s national weather agency predicted on Friday.

An El Nino weather event happens when warming sea surface temperatures in the tropical eastern Pacific trigger worldwide changes in winds, atmospheric pressure and rainfall, as well as higher global temperatures overall.

Adam Scaife, head of long-range forecasting at the weather agency, told the BBC: “We are expecting the biggest El Nino for over a century, peaking at something over three degrees — that is unheard of in modern climate records.”

This means Pacific water would heat up more than 3C above the norm in the coming months.