A dangerous wave of wildfires is spreading rapidly across the tropics, bringing the Amazon rainforest face-to-face with a rapidly escalating environmental crisis. Fueled by a severe drought closely linked to the recurring climate phenomenon El Niño, aggressive fires are sweeping through vast parts of Brazil. The cascading disaster has filled major metropolitan areas with thick, hazardous smoke and is aggressively threatening ecosystems and forests that were already severely damaged and weakened by previous, punishing fire seasons.

Unlike sudden natural disasters such as tornadoes or severe thunderstorms, which can unleash widespread destruction in a matter of minutes, El Niño exerts its influence over weather patterns across many months. This major climate phenomenon can profoundly disrupt normal rainfall patterns over vast global regions, creating unusually dry, arid conditions that allow flames to spread with terrifying speed and intensity. Scientists and climate researchers are now issuing urgent warnings that the Amazon basin may only be entering the very beginning of what threatens to be a prolonged, highly destructive fire season.

NASA Satellites Detect Surging Amazon Wildfires

Beginning in September 2026, continuous satellite observations revealed a sharp, alarming increase in both active fires and heavy smoke emissions sweeping across the central and eastern sectors of the Amazon. This growing thermal and atmospheric activity was immediately captured by several advanced monitoring systems, including NASA’s Fire Information for Resource Management System (FIRMS), the Global Fire Emissions Database (GFED), and NASA Worldview imagery.

The vast affected area currently extends outward from the dense forests surrounding Manaus and Santarém—two vital commercial, economic, and transportation hubs in Brazil—stretching eastward toward the sprawling mouth of the Amazon River.

On October 12, 2026, the MODIS (Moderate Resolution Imaging Spectroradiometer) instrument aboard NASA’s Aqua satellite captured a striking and troubling image showing enormous plumes of thick, dark smoke billowing upward from fires burning fiercely on both sides of the Amazon River.

At the exact time of the satellite overpass, a dense, suffocating blanket of smoke had completely engulfed Manaus, the sprawling capital of Brazil’s Amazonas state. City officials reported dangerously polluted air conditions, with concentrations of fine particulate matter, known as PM2.5, soaring past 135 micrograms per cubic meter. These microscopic, dangerous particles are capable of penetrating deep into human lungs, posing severe, immediate health risks to the general population. These alarming measurements instantly placed the city’s air quality into the second-worst category on the regional air quality index scale.

The sudden influx of toxic smoke brought massive disruptions to daily life in Manaus, a major urban center that is home to more than two million residents. Local authorities were forced to shut down schools, cancel public outdoor events, and suspend children’s sports leagues as municipal governments issued urgent warnings to residents, advising them to stay indoors and avoid the deeply hazardous environmental conditions.

El Niño Is Triggering a Wildfire Domino Effect

According to Douglas Morton, a prominent Earth system scientist working at NASA’s Goddard Space Flight Center, the intensifying fires burning around the critical hubs of Manaus and Santarém are not isolated incidents. Instead, they are part of a much larger, interconnected global pattern.

Morton describes the phenomenon as an extensive "cascade" of tropical fires that are directly driven by severe rainfall disruptions intimately associated with El Niño. The destructive sequence typically begins near the global equator, where spreading drought helps to spark and ignite widespread peat fires in Indonesia. These persistent fires burn relentlessly through thick, carbon-rich organic material locked deep within the soil. As exceptionally dry conditions subsequently develop elsewhere across the globe, fire activity rapidly intensifies in other vulnerable equatorial zones, including the central and eastern expanses of the Amazon.

This overarching pattern is entirely unprecedented, following closely in the footsteps of previous climate events. Following the devastating 2015-2016 El Niño cycle, Morton collaborated closely with researchers from the University of California, Irvine; Vrije Universiteit Amsterdam; and the University of Maryland to closely examine how tropical fires reliably followed shifting regional rainfall patterns. Their comprehensive findings were formally published in a 2017 scientific study, and researchers subsequently observed a remarkably similar sequence unfold during the 2023 El Niño cycle.

Now, the ongoing 2026 El Niño is proving to be no exception, producing the exact same troubling progression across the globe.

Indonesia has already endured grueling months marked by unrelenting drought, heavy smoke, and deeply destructive fires that began as early as August. Throughout October, intense wildfires destroyed hundreds of homes and residential structures, while dense, choking smoke blanketed entire islands on most days of the week.

"Now, in the Amazon, we’re seeing the second domino in the cascade fall," Morton said, pointing specifically to the alarming surge of uncontrolled fires spreading across the Brazilian states of Pará and Amazonas.

Scientists Warn More Fires Could Spread Into 2027

The current surge in wildfire activity may unfortunately represent only a single stage of a much longer, protracted fire season that could stretch deep into the future.

Morton and his dedicated team of colleagues anticipate that overall fire activity will continue to expand northward throughout November and December 2026. The specific geographic regions currently most at risk include the Brazilian states of Roraima and Amapá, northern Pará, and neighboring portions of Venezuela, Guyana, and Suriname.

Following this northward expansion, the dangerous weather pattern is projected to shift dramatically toward the south. By August and September of 2027, worsening drought conditions and heightened wildfire danger are expected to reach their absolute peak intensity in the southern Amazon regions of Brazil, as well as neighboring Paraguay.

One particularly troubling and disheartening aspect of the current environmental crisis is the realization that many of the forests currently under threat have already burned during past climate emergencies.

"It’s so striking — and frustrating — that this is happening all over again," Morton noted, emphasizing the tragic reality that fragile rainforest ecosystems affected by the severe 2015 and 2023 El Niño events are once again catching fire and burning.

Wildfires are exceptionally destructive when they strike tropical rainforests because the vast majority of the plant and animal species living within these rich ecosystems have simply not evolved to withstand frequent or recurring burning. Unlike other global ecosystems where fire is a regular, natural part of the ecological life cycle, Amazon forests suffer severe, profound, and exceptionally long-lasting damage when flames sweep through their undergrowth.

Furthermore, previous fires have left large parts of the forest structurally vulnerable. Trees that were only partially burned or heat-stressed during earlier events remain weakened or severely damaged, making the remaining vegetation far more susceptible to future blazes. Morton warned that some of the current, aggressive fires could therefore burn with a much higher intensity than anything witnessed in previous years.

He expects the ongoing fires burning near Manaus and Santarém to persist unabated until seasonal rains finally return to the region, which is currently projected to happen around December 2026 or January 2027.

However, communities situated in regions farther to the north and the south still retain a narrow window of opportunity to actively mitigate the danger and prevent catastrophic damage before local conditions deteriorate further.

"Given the intensity of this El Niño, this really is the year for people to avoid burning at all costs," Morton stressed.

Extreme Drought Turns Human-Started Fires Into Wildfires

Although the Amazon basin is currently experiencing a historic and severe fire emergency, natural lightning strikes are remarkably rarely responsible for igniting fires within Brazil’s lush tropical rainforest.

Under normal climatic conditions, the region is naturally so wet and humid that lightning is responsible for triggering less than 1 percent of all recorded fires, according to data cited by Morton. This fundamental ecological reality means that nearly all of the fires currently tearing through the Brazilian Amazon originated directly from human activity.

What makes the year 2026 particularly perilous, however, is the sheer severity of the ongoing drought conditions gripping the country.

Data released by Brazil’s National Institute of Meteorology revealed that total rainfall recorded in Manaus plummeted to an astonishing 95 percent below normal levels in August, followed by an additional 60 percent deficit below normal levels in September.

These exceptionally dry, arid conditions have effectively transformed localized fires that might otherwise have remained safely confined to managed agricultural areas into raging, uncontrolled wildfires.

Morton explained that many of the larger, most destructive blazes began as deliberately set fires utilized for routine land management purposes. These practices typically include burning away shrubs and brush to clear grazing land for livestock or eliminating unwanted crop residue from agricultural fields after a harvest. Once the dry winds caught the flames, the fires rapidly escaped containment boundaries and surged directly into the rainforest’s parched understory—the dense layer of delicate vegetation growing directly beneath the towering canopy trees.

Advanced satellite analysis currently suggests that approximately 50 to 70 distinct, uncontrolled wildfires are actively burning within the Santarém area alone, according to Shane Coffield, an assistant research scientist at the University of Maryland who is currently stationed at NASA Goddard.

NASA Uncovers Hidden Fires That Satellites Are Missing

Despite the advanced capabilities of modern space technology, the actual number of active Amazon wildfires may be substantially higher than standard, publicly available satellite monitoring systems currently indicate.

As an integral part of an ongoing NASA Earth Action project, Coffield is closely studying specialized observations collected by the Visible Infrared Imaging Radiometer Suite (VIIRS), an advanced satellite instrument specifically designed to detect thermal heat signatures associated with active fires on the Earth’s surface.

His primary scientific goal is to identify hidden fires that routinely fail to meet the stringent detection thresholds utilized in official FIRMS data products.

These additional detections, frequently categorized as "candidate fires," could ultimately help researchers develop a vastly more complete, accurate picture of true wildfire activity across the globe. Coffield plans to directly provide the precise geographic locations of these hidden blazes to MapBiomas, a collaborative, multidisciplinary network composed of universities, nongovernmental organizations, and private technology companies that meticulously tracks fires and ongoing changes in land use throughout the entire Amazon basin.

Initial findings from this focused research suggest that conventional, everyday satellite monitoring is consistently overlooking a remarkably significant number of active blazes.

"For the area around Santarém, we’ve identified about 40 percent more fires than you’ll see in active fire counts from FIRMS," Coffield stated.

Detecting active fires burning deep beneath a dense rainforest canopy can prove to be an extraordinarily difficult scientific challenge, even when utilizing the most sophisticated remote-sensing instruments currently operating in orbit. Standard satellite sensors typically identify active wildfires by measuring specific wavelengths of infrared radiation, which reveal the intense heat generated by burning vegetation on the ground.

However, thick, persistent layers of smoke, heavy cloud cover, and immensely dense tree canopies can severely interfere with those critical measurements. Fires that creep slowly and quietly through the subterranean understory are particularly difficult to detect from space because the thick vegetation towering above them effectively conceals their thermal heat signatures from orbital sensors.

Consequently, official satellite fire counts can occasionally plummet even while extensive, destructive burning continues unabated on the forest floor below.

"On some of the smokiest days, we have very few detections from MODIS and VIIRS, and we know that isn’t right," Coffield noted.

By systematically identifying and cataloging the fires that existing monitoring systems consistently overlook, NASA researchers hope to provide both the scientific community and local land managers with a vastly more accurate understanding of the unprecedented threats facing the Amazon rainforest as the relentless El Niño-driven fire season continues to unfold.