A low-pressure system is bringing unstable weather to southern Brazil, where the National Institute of Meteorology (Inmet) issued red alerts for severe storms on Wednesday, November 4. The warnings cover southern Paraná, all of Santa Catarina and northern Rio Grande do Sul; other areas in the region are under orange alerts.
The red-alert areas include municipalities such as Francisco Beltrão, Pato Branco, União da Vitória and Guaratuba in Paraná, and Passo Fundo, Erechim, Caxias do Sul, Santo Ângelo and Ijuí in Rio Grande do Sul. Storms may bring lightning and hail. On Thursday, rain and thunderstorms are expected to continue in Paraná, which will be under a yellow alert, and in central and northern Santa Catarina. Much of Rio Grande do Sul is forecast to have clearer skies.
Rainfall totals through November 10 are expected to reach 40–80 mm across much of the South, with 80–100 mm possible in central and western Rio Grande do Sul. Some locations in southern Paraná could exceed 100 mm. Temperatures are forecast to ease on Thursday, with highs of 25°C in Curitiba and Porto Alegre and 24°C in Florianópolis.
In the Southeast, heat and humidity are expected to bring showers and thunderstorms to São Paulo, Minas Gerais, Rio de Janeiro and southern Espírito Santo on Wednesday. The area near the São Paulo–Paraná border faces the strongest storms, while yellow alerts cover other parts of São Paulo, Rio de Janeiro, Espírito Santo and much of Minas Gerais. Further showers may affect São Paulo and Rio de Janeiro on Thursday. Accumulations through November 10 could reach 20–60 mm in parts of the region, with isolated totals above 70 mm. Highs may reach 34°C in São Paulo and 35°C in Rio de Janeiro on Wednesday; Rio could reach 37°C on Thursday.
Across the Center-West, rain is forecast in much of the region. Mato Grosso do Sul is expected to see cloudy skies and thunderstorms on Wednesday, with an orange alert in the south near the Paraná border. Yellow alerts also cover parts of Mato Grosso, Goiás and Mato Grosso do Sul. Showers are forecast to continue on Thursday, and totals through November 10 are expected to be 10–30 mm across most of the region. Later in the week, storms could bring daily totals of 20–30 mm to Mato Grosso do Sul and southern Mato Grosso.
In the North, hot conditions will persist, with rain mainly in western areas. Showers are forecast on Wednesday in Amazonas, Acre, Rondônia, central and southern Pará, and Tocantins. On Thursday, thunderstorms may continue in Acre, Rondônia and parts of Amazonas, with isolated rain possible in Roraima and southwestern Tocantins. By November 10, western Amazonas could receive 30–60 mm, with isolated totals above 80 mm. Amapá and northern and northeastern Pará are expected to receive less than 10 mm.
The Northeast coast is forecast to stay sunny and hot, with no beachside rain expected on Thursday. Isolated showers may occur inland, including in parts of Maranhão, Piauí and western Bahia. The west and south of Bahia are expected to record the region’s highest totals through November 10, at 30–50 mm, with isolated areas reaching 60–70 mm. Teresina is forecast to reach 39°C on both Wednesday and Thursday.
Sources: Olhar Digital.