El Niño is Here: The Science, The Risks, and What Comes Next
You've seen the headlines and heard the discussions on social media. The El Niño is here. But many outlets and facets of media provide false information or even unlikely theories on how the event will impact us. Here, we will iron out all the facts, what causes it and what could end it, how this event can shape our society, and what we can do about it.
What Is An "El Niño"?
An El Niño is a weather pattern in which the ocean's surface warms up, causing "above average" temperatures, according to U.S. Geological Survey. However, this event occurs specifically in the equatorial Pacific region. It starts when the regional winds weaken, causing a large pool of warm water to move in the opposite direction-to the east. However, this break in movement disrupts the primary zone of thunderstorm activity alongside it, affecting not just the ocean current, but the jet stream and global climate as a whole. The National Oceanic and Atmospheric Administration (NOAA) states that this phenomenon occurs every 3 to 5 years, but studies have found that global warming has been accelerating the frequency of the event.
How Does This Affect Us?
Contrary to many Instagram reels and Tiktoks, El Niño's don't cause the same effect everywhere in the world. Additionally, an El Niño in five years can have a different effect on one region-say Eastern Europe- then the one we're currently experiencing. The most important thing to remember about this event is it's extreme variability. Climate scientist Dr. Emily Becker explains that the state of California has a 2/3 chance of receviing above-average rainfall out of three El Niño seasons. When there is substantial rain, it comes in downpours for months, causing flooding and deaths. However, when that 1/3 occurred in 2016 , the state remained in an extreme drought, leaving many disappointed. The weather effects vary by region, whether that within the country or globally.
This Year is a Mystery
Scientists are not exactly sure how climate change will change the El Niño's behavior. It is standard for global temperatures to rise during an El Niño and cool down after its cycle, but it never cools enough to go back to its previous basis. Additionally, climate change (primarily theorized by fossil fuels) is making these events more powerful and frequent than ecosystems such as coral reefs can recover from before it arrives next. When it comes to the food chain, these spikes in temperature cause a drop in phytoplankton nutrients, causing fish like sardines or anchovies to migrate to different regions. On the other hand, disrupted and stressed rainforests might start reversing it's carbon storage and start releasing more carbon than it absorbs, only accelerating global warming.
What Can We Do About It?
Researchers are using different approaches in data monitoring to understand what lies in store for us before the event hits us at peak strength. One way researchers prepare is through a network of scientific buoys spread across the tropical Pacific Ocean. These buoys collect continuous measurements of sea-surface temperature, winds, air pressure, ocean currents, and conditions beneath the surface. They must watch how warm water moves eastward, whether the trade winds weaken, and whether the ocean and atmosphere begin reinforcing one another. After data collection the researchers compare the statistics with past El Niño data, trying to accurately predict the behavior of ocean and the effects we will face in different regions.
Another way is to feed this information into dynamic physical models. Unlike a simple prediction based only on past El Niño events, these models use equations representing real-world processes—such as ocean circulation, wind patterns, evaporation, and heat transfer—to simulate what may happen months ahead. The models cannot promise exactly how much rain, heat, or drought a particular town will experience, but they can show where the risks are growing and give communities valuable time to prepare.
This year, that preparation is especially important. The ocean near Kiritimati, or Christmas Island, in the central Pacific was already about 2 degrees Celsius warmer than average in August, and coral reefs there were actively bleaching even before El Niño’s typical winter peak. Scientists are watching closely because these unusually warm conditions could signal an especially consequential season.
El Niño's are naturally occurring interactions between the atmosphere and the Pacific Ocean. However, preparation can make its effects less destructive. People should follow and listen to the information from local weather agencies rather than the viral posts that claim El Niño will produce the same result everywhere.
Make emergency plans, monitor flood and heat alerts, protect important documents, and keep enough water, food, medication, and batteries for severe-weather disruptions.
At a larger scale for communities, advocate for drainage systems, strengthened flood protections, water conservation in drought-prone areas, improving wildfire readiness, and ensuring that warnings reach people who are most vulnerable.
The climate system is connected. A change in Pacific Ocean temperatures can affect rainfall, food supplies, coral reefs, wildfires, and public health thousands of miles away. So, while we cannot prevent the El Niño we will face this year, what we can do is take actionable steps to mitigate its strength in the future as well as educate ourselves about this danger in order to protect ourselves and ecosystems around us.
Sources:
https://www.nytimes.com/2026/09/09/weather/el-nino-weather-forecast-facts.html
https://www.usgs.gov/faqs/what-el-nino-and-what-are-its-effects
https://www.noaa.gov/education/resource-collections/weather-atmosphere/el-nino
https://sealevel.nasa.gov/news/48/a-not-so-fond-farewell-to-el-nino/
https://www.wri.org/insights/super-el-nino-impacts-explained
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