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Latin America El Niño response: floods, drought, and risks

Updated 31 times since CLSTR started tracking revisions of this situation.

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2026-09-12 12:09 UTC → 2026-09-14 16:00 UTC · added ~~removed~~

As of mid-September 2026, the El Niño phenomenon—referred to by some as ‘Super Niño’—continues to drive extreme weather risks across Latin America. The National Meteorological Service (SMN) in Argentina maintains a 100% probability that the phenomenon will persist through the current quarter with strong or very strong intensity, with peak impacts anticipated between late October and February. In Argentina, ~~the Universidad Nacional del Litoral (UNL), alongside the Federación Universitaria del Litoral (FUL), has launched~~ a call for volunteers to establish a trained network of students, faculty, and graduates. This initiative, coordinated with the Municipality of Santa Fe, aims to provide support in environmental risk management, sanitation, and health during pre-emergency, emergency, and post-emergency phases. Adding to the regional volatility, a polar maritime air mass has ~~moved across Argentina, bringing intense cold, wind, and precipitation.~~ triggered widespread extreme weather alerts. The SMN has issued yellow alerts for ~~strong winds on the Atlantic Coast and for storms,~~ extreme cold, rain, and ~~snow~~ snow. Significant temperature drops have been reported in Tucumán, Córdoba, San ~~Juan. Mendoza is bracing~~ Luis, Mendoza, and Buenos Aires. In Tucumán, Route 307 has closed due to ice and snow, while in Córdoba, heavy snowfall forced the total closure of the Altas Cumbres route (E-34). Southern provinces, including Santa Cruz and Tierra del Fuego, are also under yellow alerts for ~~extreme~~ snowfall accumulations of 10 to 20 centimeters. In Uruguay, Inumet reports a cold weekend with temperatures around 14°C in Montevideo. To mitigate regional risks, the provinces of Córdoba, Santa Fe, and Entre Ríos have signed a regional cooperation agreement to coordinate emergency responses. In Santa Fe, Vialidad Nacional has implemented prevention schemes for the road network to prepare for a potential ~~snow~~ rise in ~~mountainous areas, while Buenos Aires,~~ the Paraná River, specifically targeting National Routes 168 and 11. Similarly, in Entre Ríos, Civil Defense and ~~San Luis face plummeting temperatures.~~ Volunteer Firefighters are coordinating protocols for the Uruguay River basin to manage potential flooding. Researchers from the University of Buenos Aires (UBA) have further warned that El Niño is expected to intensify between September and November, heightening the risk of flooding and heavy rainfall, particularly in the Litoral region and Buenos Aires province. ~~Meanwhile, agricultural authorities in Paraguay and Argentina continue to advise producers to adjust management strategies to mitigate risks from heavy rainfall and nutrient washout.~~

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