The National Oceanic and Atmospheric Administration (NOAA) has officially declared that El Niño has returned to the eastern Pacific Ocean [1].
This climate development matters because the phenomenon alters global weather patterns, often leading to significant shifts in temperature and precipitation across different continents [2]. By tracking these changes, meteorologists can better predict extreme weather events and prepare infrastructure for potential flooding or droughts [3].
El Niño occurs when equatorial Pacific waters become warmer than normal [4]. This shift in ocean temperature disrupts the atmospheric circulation that typically regulates weather in the Americas and beyond. While the current declaration confirms the event's arrival, previous forecasts had indicated an 82% chance [5] of El Niño occurring between May and July 2024 [5].
ABC News meteorologist Ginger Zee said the NOAA declaration noted the impact the pattern has on regional climates [1]. In the U.S., the effects can vary depending on the geography, often influencing summer weather patterns in states like Texas [6].
Scientists monitor the eastern Pacific to determine the strength of the event. Some forecasts had previously suggested the possibility of a "super" El Niño, which would represent an exceptionally strong version of the cycle [7]. Such events typically result in more dramatic weather anomalies globally, ranging from heavier rainfall in the southern U.S. to severe droughts in Southeast Asia [7].
NOAA continues to track the sea surface temperatures to determine how long this cycle will persist and how intensely it will affect the coming seasons [1].
“NOAA has officially declared that El Niño has returned”
The return of El Niño signifies a shift in the ocean-atmosphere system that typically leads to warmer winters in the northern U.S. and wetter conditions in the south. Because this cycle influences the jet stream, its official arrival allows global agricultural and emergency management sectors to implement mitigation strategies for the specific weather extremes associated with the pattern.
