As the Pacific Ocean warms to alarming levels, a new interactive map from the Climate Impact Lab is painting a stark picture of what the coming months could bring. The tool, which tracks the effects of the current Super El Niño, projects that more than 373,000 people could lose their lives to extreme heat between October 2026 and March 2027. The hardest-hit regions include parts of Brazil, Nigeria, and India, where a third of those deaths are expected to occur.
The map draws on data from thousands of regions worldwide, comparing current conditions to historical averages from 1996 to 2005. Researchers at the University of Chicago's Climate Impact Lab have been monitoring ocean surface temperatures in the Niño 3.4 sector of the Pacific, where readings have surged 3.4°C above normal during the week of October 18–24. That spike is a key driver of the extreme weather patterns now unfolding.
What the data reveals
The study estimates that the event has already caused 484,500 additional deaths since June, with a projected total of 857,400 by March 2027. That means more than half of the fatalities are expected in the next six months. Michael Greenstone, co-founder of the Climate Impact Lab, emphasized the importance of these predictions: "Anticipating the lethal effects of thermal stress through new predictive capabilities empowers governments to identify high-risk zones and act promptly."
For Latin America, the implications are especially serious. Brazil tops the list of countries with the highest projected heat-related mortality, while Central America faces an increased risk of drought. The World Meteorological Organization (WMO) has warned that this Super El Niño could push global temperatures up to six times higher than typical events between November and January, accelerating drought conditions across the region and fueling wildfires in Southeast Asia.
Regional impacts and preparedness
The map also highlights how different areas will experience the heat differently. In the United States, forecasters at AccuWeather expect more storms across the South and West, while New York could see up to 25% less snow than usual. In South America, the Paraná River in Paraguay has already experienced severe flooding, a reminder that El Niño's effects are not limited to heat alone.
For communities across the Americas, the message is clear: preparation is key. Governments are studying climate shelters and urban infrastructure changes to help protect vulnerable populations from heat stroke. Continuous monitoring of Pacific Ocean temperatures remains essential, as scientists work to refine their predictions and give communities the tools they need to respond.
As the world watches the Pacific, the data serves as a vital baseline for mitigating the environmental havoc associated with this Super El Niño. For those in the path of the heat, the map is more than a scientific tool—it's a call to action.
