The UK Met Office has issued a stark warning that a powerful El Nino event, potentially of record strength, is forming in the Pacific Ocean. Adam Scaife, head of long-range prediction at the Met Office, stated that the event could be classified as a 'Super El Nino' and may even surpass previous records. The U.S. National Oceanic and Atmospheric Administration projects a 63 per cent likelihood that this El Nino will rank among the largest since 1950.
El Nino is a natural climate pattern characterised by warming of surface ocean temperatures in the central and eastern equatorial Pacific. It disrupts normal weather patterns by weakening trade winds, causing warm waters to shift eastward towards the Americas. This alters the Pacific jet stream and can lead to droughts in some regions and heavy rainfall in others, affecting ecosystems and weather globally.
The impacts are expected to be far-reaching. The northern US and Canada may face hotter and drier conditions, while the US Gulf Coast and southeast could see increased flood risk. Countries around the tropical Pacific, such as Chile and Indonesia, are likely to experience heavy rainfall and droughts respectively. An extreme Pacific typhoon season and a more unpredictable South Asian monsoon are also anticipated, along with drier conditions in Australia.
In the UK, the El Nino effect is typically weaker but can lead to more dramatic weather extremes. Winter temperatures may become colder, especially later in the season, while summers could see soaring temperatures. Professor Bill McGuire of University College London warned that summer temperatures could exceed 40°C, possibly as early as next year.
A 'Super El Nino' is defined by sea surface temperatures more than 2°C above normal for the time of year. Ocean warming has been rapid and is expected to peak in autumn, with extreme conditions lasting two to four months. The Crucial laboratory at Lancaster University indicates over an 85 per cent chance of El Nino conditions prevailing during the upcoming winter, with a 45 per cent chance of a Super El Nino.
