What Is El Niño, and What Does It Mean for Weather, Water, and the Global Economy?

Key Points:

• The 2023-24 El Niño event is developing rapidly and is likely to become one of the strongest on record, with sea surface temperatures in the Niño 3.4 region potentially reaching 3.6°C above normal, surpassing the 2015-16 event.
• El Niño is characterized by warmer-than-normal Pacific Ocean temperatures and weakened trade winds, which trigger global weather shifts including increased rainfall in the US Southwest, droughts in Indonesia and southern Africa, and milder Atlantic hurricane seasons.
• A "Super El Niño" refers to events with temperature rises of at least 2°C above average; previous super events caused significant impacts like severe droughts and flooding, highlighting that even beneficial effects can lead to adverse outcomes.
• NOAA predicts over a 90% chance of this El Niño becoming very strong this fall and winter, which could result in widespread disruptions to fisheries, agriculture, water resources, and seasonal weather patterns worldwide.
• Understanding and anticipating El Niño's effects is crucial for preparedness, as its influence extends to global temperature spikes, altered precipitation patterns, and increased humanitarian needs in affected regions.