The world should brace for high global temperatures and possibly record-breaking new heat levels as the weather phenomenon El Nino looks more and more likely to develop in the coming months, the United Nations warned on Wednesday.
The U.N.'s World Meteorological Organization now estimated there was a 60% chance that El Nino would develop by the end of July and an 80% chance it would do so by the end of September.
El Nino, a naturally occurring climate pattern typically associated with increased heat worldwide, drought in some parts of the world, and heavy rains elsewhere, last occurred in 2018-19.
Since 2020 though, the world has been hit with an exceptionally long La Nina – El Nino's cooling opposite – which ended earlier this year, ceding way to the current neutral conditions. And yet, the U.N. has said the last eight years were the warmest ever recorded, despite La Nina's cooling effect stretching over nearly half that period.
Without that weather phenomenon, the warming situation could have been even worse.
La Nina "acted as a temporary brake on global temperature increase," WMO chief Petteri Taalas said in a statement. "The development of an El Nino will most likely lead to a new spike in global heating and increase the chance of breaking temperature records," he warned.
At this stage, there is no indication of the strength or duration of the looming El Nino. The last one was considered weak, but the one before was considered vital between 2014 and 2016, with dire consequences. WMO pointed out 2016 was "the warmest year on record because of the 'double whammy' of a compelling El Nino event and human-induced warming from greenhouse gases."
Since the El Nino effect on global temperatures usually plays out the year after it emerges, the impact will likely be most apparent in 2024, it said.
"The world should prepare for the development of El Nino," Taalas said. He said this "might bring respite from the drought in the Horn of Africa and other La Nina-related impacts, but could also trigger more extreme weather and climate events," stressing the need for effective early warning systems "to keep people safe."
No two El Nino events are the same, and their effects depend partly on the time of year, WMO said, adding that it and national meteorological services would closely monitor developments.
The climate pattern occurs on average every two to seven years and usually lasts nine to 12 months. It is typically associated with warming ocean surface temperatures in the central and eastern tropical Pacific oceans.
Increased rainfall is usually seen in southern South America, the southern U.S., the Horn of Africa, and Central Asia. However, severe droughts can occur in Australia, Indonesia and parts of South Asia.
During summer in the Northern Hemisphere, El Nino's warm water can also fuel hurricanes in the central and eastern Pacific Ocean while hindering hurricane formations in the Atlantic Basin, WMO said.
