The first episode of ZCAS (South Atlantic Convergence Zone) of 2026 is beginning to take shape, bringing, from this Saturday (3), a pattern of persistent and widespread rain, typical of the Brazilian summer.
According to a bulletin released by the weather company Climatempo, the ZCAS (South Atlantic Convergence Zone) is expected to cause consecutive days of instability, with frequent rainfall and high accumulated volumes, increasing the risk of disruption in urban and rural areas.
The South Atlantic Convergence Zone (SACZ) is characterized by the formation of a moisture corridor that extends from the Amazon region to the Southeast of the country, favoring the occurrence of almost continuous rainfall.
Unlike isolated storms, this weather system stands out for its prolonged duration, which increases the potential for impacts such as flooding, landslides, and rising river levels.
Most affected regions
According to Climatempo, the storm predicted for the beginning of 2026 should mainly affect areas of the Southeast, Midwest, and part of the North, especially Minas Gerais, Espírito Santo, Rio de Janeiro, Goiás, and Mato Grosso. In these regions, the forecast indicates significant rainfall accumulations over several days.
The bulletin warns that even when rainfall is not intense on a single day, the daily repetition of precipitation increases the risk of soil saturation. This scenario is especially worrying in dense urban areas, slopes, and regions already sensitive to hydrological events.
Pay close attention to the impacts.
Climatempo highlights that ZCAS episodes usually require heightened attention from authorities and the public due to the potential for cumulative impacts. Traffic disruptions, damage to infrastructure, problems in the supply of essential services, and security risks are effects frequently associated with this type of system.
This scenario increases operational exposure and puts pressure on decision-making in strategic sectors such as infrastructure, energy, and agribusiness. Soil saturation and loss of carrying capacity increase the vulnerability of roads, linear infrastructure projects, and transmission lines.
The alert for the first ZCAS episode of 2026 reinforces the importance of continuous monitoring of weather conditions and the adoption of preventive measures, especially in municipalities historically vulnerable to prolonged rainfall.
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