The U.S. National Oceanic and Atmospheric Administration (NOAA) Climate Prediction Center officially announced the onset of the 2026-2027 El Niño event on Thursday, July 11. The agency confirms that the phenomenon is now established in the equatorial Pacific Ocean, characterized by rising sea surface temperatures and significant shifts in atmospheric pressure and wind patterns. Experts expect the event to intensify throughout the second half of the year, with a 63% probability of reaching “very strong” intensity between November 2026 and January 2027.
What characterizes this El Niño event?
According to NOAA, this El Niño is defined by an established “coupling” between the ocean and the atmosphere. While surface temperatures in the central and eastern Pacific have risen above average, the phenomenon also requires a corresponding atmospheric response, including altered wind patterns and changes in cloud cover. Monitoring data reveals that the Oceanic Niño Index (ONI) has remained above the necessary threshold for weeks, confirming the transition. In some areas off the coast of Peru, sea surface temperatures are currently measuring up to 8ºC higher than normal.
Did You Know? The current event follows a previous El Niño cycle that lasted from May 2023 to April 2024, which included the historic May 2024 flooding in Rio Grande do Sul that damaged over 400 municipalities.
What is the outlook for the coming months?
Climate models suggest this event could become a “Super El Niño,” potentially rivaling the historic intensities recorded in 1982-1983 and 1997-1998. Meteorologists note that high heat content stored in the ocean, combined with western wind anomalies, increases the likelihood of continued intensification. While the peak intensity is projected to occur between October and November 2026, experts caution that the timing of peak intensity does not always align with the timing of the most severe climate impacts. For example, during the 2023-2024 cycle, the peak occurred in November, but the most significant disaster—the floods in Rio Grande do Sul—did not take place until May 2024.
How will this impact Brazil?
The southern region of Brazil is expected to be the most heavily affected area in the country. Historical data indicates that El Niño typically brings extreme rainfall, river flooding, and severe weather events including hail and high winds to the South. Conversely, northern regions of Brazil often experience a decrease in precipitation. While the risk of catastrophe is elevated, analysts emphasize that there is no linear relationship between the intensity of an El Niño and the specific magnitude of local disasters, as these depend on a combination of parallel atmospheric factors that are best assessed via short-term forecasting.
Expert Insight: As an editor covering climate trends for two decades, I find the distinction between “peak intensity” and “peak impact” critical for public safety. Residents in high-risk zones should not view the calendar date of the phenomenon’s maximum strength as a signal that the danger has passed; rather, the atmospheric instability often creates a delayed reaction that can manifest as severe weather months after the ocean temperatures themselves have begun to stabilize.
Frequently Asked Questions
How long is the 2026-2027 El Niño expected to last?
The phenomenon is not a short-term weather event and is expected to persist at least until the autumn of 2027.
Will this El Niño repeat the 2024 flood disaster?
Not necessarily. While the intensity may be higher than the 2023-2024 event, there is no direct link between the strength of the phenomenon and the occurrence of a specific disaster, which depends on multiple local atmospheric variables.
How do experts measure the start of this event?
The start is determined by the coupling of oceanic and atmospheric indicators, specifically the Oceanic Niño Index (ONI) and the Southern Oscillation Index (SOI), which tracks atmospheric pressure differences across the Pacific.
How are local authorities in your area preparing for potential weather extremes in the coming months?
