An area is uncovered by the lowering of the water level from the Magdalena river, the longest and most important river in Colombia, due to the lack of rain, in the city of Honda, January 14, 2016. (Photo: REUTERS)

After three years of the La Nina climate pattern, which often lowers global temperatures slightly, the hotter El Nino is back in action, according to an advisory issued on Thursday by the US National Oceanic and Atmospheric Administration's Climate Prediction Center.

El Nino is born out of unusually warm waters in the Eastern Pacific, near the coast of South America, and often accompanied by a slowing down or reversal of the easterly trade winds.

"In May, weak El Nino conditions emerged as above-average sea surface temperatures strengthened across the equatorial Pacific Ocean," the advisory said.

The last time an El Nino was in place, in 2016, the world saw its hottest year on record. Coupled with warming from climate change, 2023 or 2024 could reach new highs.