Brazilian authorities and meteorological agencies have issued alerts for heavy and voluminous rainfall across several regions of the country [1, 3].
These warnings highlight a period of significant meteorological instability that threatens infrastructure and public safety in diverse geographic zones, from the Northeast coast to the southern states.
In the Northeast, the coast—including Bahia, Alagoas, and Pernambuco—entered an alert phase for voluminous rains on June 3 [1]. Some areas in the eastern Nordeste were expected to see accumulated rainfall of nearly 200 mm [2]. In certain locations, officials said that rainfall might exceed the total volume expected for the entire month [1].
Meanwhile, the state of São Paulo faced a different set of challenges. The Defesa Civil de São Paulo issued alerts for storms and cold weather, with the warning remaining in effect until June 18 [3, 4].
Southern and Southeastern regions also faced instability due to cyclonic activity. A cyclone was expected to bring frequent rains starting June 8 [5]. These patterns align with data from the European Centre for Medium-Range Weather Forecasts (ECMWF), whose extreme precipitation index signaled several days of intense rain for the South and parts of the North and Northeast [6].
Local agencies continue to monitor these systems to mitigate the risks of flooding and landslides. The combination of seasonal weather patterns and specific meteorological events, such as the approaching cyclone, has created a high-risk environment for urban centers and rural areas alike [6].
“Rainfall may exceed the total volume expected for the entire month in some areas”
The simultaneous occurrence of extreme precipitation in the Northeast and cyclonic activity in the South indicates a volatile atmospheric period for Brazil. When rainfall exceeds monthly averages in a matter of days, it often leads to saturated soils and urban drainage failures, increasing the likelihood of landslides and flash floods in densely populated regions like São Paulo.
