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Storm Warnings Spread Across Central-Southern Brazil

Meteorologists say a forming extratropical cyclone and frontal system could produce organized severe storms that raise the risk of tornadoes and very high wind gusts over the coming days.

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Overview

  • On Wednesday, national and state agencies including INMET and multiple Defesa Civils issued yellow and amber warnings for heavy rain, hail and gusts up to about 60–65 km/h across wide areas of central and southern Brazil.
  • Forecasters say the threat will intensify on Thursday and Friday as a low-pressure area and an advancing front begin forming an extratropical cyclone, which could allow storms to organize into supercells capable of producing tornadoes.
  • Paraná, São Paulo and the extreme south of Mato Grosso do Sul are cited as the highest-risk states with forecast gusts of about 85 km/h in parts of Paraná and winds above 90 km/h possible in the worst-hit zones of Mato Grosso do Sul.
  • Authorities warn of fast, heavy rainfall that may cause flash floods, fallen trees, power outages and crop damage, and they urge people to avoid flood zones, not shelter under trees and to report emergencies to Defesa Civil (199) or Corpo de Bombeiros (193).
  • Models show the system weakening by September 12 with colder air arriving but meteorologists stress uncertainty in exact storm tracks and urge residents to follow local updates for changing warnings and specific municipal forecasts.