Cold Snap Intensifies in Southern Brazil, Reaching Southeast with Frost Risk

A significant cold front, driven by a polar air mass, is intensifying across much of south-central Brazil this Saturday, November 4th. While the Southern Region will experience the most pronounced effects, with temperatures potentially dropping to -6°C and a widespread risk of frost, particularly in mountainous and plains areas of Rio Grande do Sul and Santa Catarina, the cold air will also impact the Southeast, Center-West, and even parts of the North. In the South, maximum temperatures are expected to hover around 12°C, creating a chilly atmosphere even in the afternoon. Isolated light rain is possible along the coast of Paraná and northern Santa Catarina, with increased cloudiness and potential rain in western Rio Grande do Sul by late Saturday. By Sunday, November 5th, the polar air mass will begin to weaken, leading to a gradual temperature increase, though early mornings will remain cold with isolated frost possible in the southern mountain ranges. The Southeast will see reduced temperatures, especially in eastern São Paulo, southern Minas Gerais, and mountainous areas of Rio de Janeiro and Espírito Santo, with lows between 5°C and 7°C. São Paulo city anticipates a cloudy Saturday with drizzle and a high of 17°C, improving slightly to 20°C on Sunday with sun and clouds. Rio de Janeiro city may experience moderate to heavy rain on Saturday, with a high of 24°C, and rain continuing into Sunday morning with a high of 22°C. Belo Horizonte will enjoy clear skies and mild temperatures around 27°C on Saturday and 25°C on Sunday. In the Center-West, Mato Grosso do Sul and southern areas of Goiás and Mato Grosso will experience minimum temperatures between 8°C and 12°C. The cold front's influence extends to parts of Acre, Rondônia, southern Amazonas, and Mato Grosso, bringing cooler temperatures ('friagem') with lows between 13°C and 15°C. Meanwhile, the rest of the North Region will remain hot and humid, with highs reaching up to 38°C. The Northeast will see rain concentrated along the coast, with moderate to heavy showers possible in Ceará, Rio Grande do Norte, Paraíba, and Pernambuco, including risks of intense rain and localized flooding in cities like Fortaleza and Natal. Isolated showers are expected in Sergipe, Alagoas, and Bahia, with stronger possibilities on Sunday in Salvador. Interior areas of the Northeast will remain hot and dry, with humidity levels as low as 20-30% in some places.