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50m ago

ZCAS Reforms, Bringing Days of Heavy Rain and Coastal Risk Across Brazil

Forecasters say a re-forming South Atlantic Convergence Zone will sustain a moisture corridor capable of dumping 200–400 mm in parts of the Southeast through Friday.

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Overview

  • INMET maintains graded warnings from South to Northeast states with “danger” and “potential danger” alerts that include 30–60 mm/h or 50–100 mm/day of rain and winds up to 100 km/h.
  • São Paulo remains under heightened monitoring as the CGE placed the capital on flood alert and civil defense sent extreme cellphone warnings, with crisis cabinets active through Monday.
  • Hydrodynamics researchers and civil defense warn the Baixada Santista of waves above 2 m and elevated tides from Jan 19–21, raising the risk of coastal flooding with heavy rain.
  • Rio de Janeiro begins the week with frequent, intense storms expected Monday and Tuesday, with the North and Northwest forecast to see some of the highest five‑day totals.
  • Additional alerts cover Rio Grande do Sul, Paraíba and Bahia, with RS instability forecast to ease after Monday and officials urging residents to follow official channels and use 199/193 for emergencies.