Closed weather in Florianópolis. Ricardo Wolffenbüttel/Secom-SC This Friday (12) will be unstable weather in much of Brazil, mainly in the South, Southeast and Central-West. The combination of a new cold front, areas of instability and a region of low pressure in the South Atlantic should spread heavy clouds from the early hours of the day, bringing a risk of heavy rain, isolated thunderstorms and wind gusts that could reach 70 km/h in some places. The alert is especially valid for areas between eastern Paraná and part of Rio Grande do Sul, as well as stretches of the coast of Paraíba and Pernambuco, where rain may also gain strength throughout the day. 📱Download the g1 app to see news in real time and for free In the South, Friday should start with rain in several places. Paraná is among the areas of greatest attention, mainly in the east of the state, where rain can be accompanied by strong winds and thunderstorms. In Curitiba (PR), the forecast is for rain since dawn, with more intense showers in the morning. The maximum temperature should be around 17°C, and the lowest temperature may be recorded at night, with the advance of cold air. In Santa Catarina, instability also appears at different times of the day, with moderate to heavy rain in some areas. Florianópolis (SC) must have a maximum temperature of 20°C. Trending videos on g1 In Rio Grande do Sul, rain is still expected to hit part of the state, especially the north, the mountains, the valleys, the coast and the Porto Alegre region. In the capital of Rio Grande do Sul, Friday begins with rain at any time between dawn and morning, in addition to the risk of thunderstorms and strong gusts. Throughout the day, instability tends to become more irregular, but the weather is not yet completely firm. The maximum in Porto Alegre (RS) should be 16°C. The entry of a new mass of cold air behind the cold front also draws attention to the weekend, when negative temperatures are forecast in areas of the South. Snow, freezing rain, freezing rain and frost: understand the differences between the phenomena In the Southeast, rain is also gaining ground this Friday, mainly in São Paulo, in the Triângulo Mineiro and in part of the south and center of Minas Gerais. The day should be cloudy in most of these areas, with lower temperatures due to cloudiness and the gradual entry of colder air. In São Paulo (SP), the sun may appear between many clouds in the morning, but there is a chance of light rain in the afternoon and drizzle at night. The maximum should be close to 21°C. It can also be strong winds in areas of the state, with gusts that can reach 70 km/h in the interior and south of São Paulo. ☁️ See the weather forecast in your city Minimum temperature forecast this Friday (12) throughout Brazil. CPTEC/Inpe In Minas Gerais, the rain should concentrate in the Triângulo, in the south and in central areas of the state. In Belo Horizonte (MG), there may be fog in the early morning, followed by a day with many clouds and moderate to heavy rain at times. The capital of Minas Gerais is expected to register a maximum of 24°C. In Rio de Janeiro (RJ), the day begins with sun between clouds, but rain may appear lightly between the afternoon and evening, with a maximum of 29°C. In Espírito Santo, rain should be more limited, and part of the north-central part of the state may be without precipitation. In the Central-West, instability is advancing mainly over Mato Grosso do Sul, south of Goiás, part of Mato Grosso and areas of the Federal District. In Mato Grosso do Sul, rain may appear early in the morning and continue at various times of the day, with a risk of heavy showers in the eastern part of the state. In Campo Grande (MS), Friday should have showers from early on, sun between many clouds throughout the day and a maximum of 24°C. At night, there is a chance of fog. In Goiás and the Federal District, the rain should mainly reach the southern half of Goiás and part of the DF, with a risk of isolated storms. In Mato Grosso, instability appears more irregularly, but it may still rain in areas of the south, southeast and north of the state. In Cuiabá (MT), the maximum should reach 31°C. READ ALSO: Rare and spectacular: cave in Brazil only receives light for 3 months and becomes a scene from another planet How Peru turned one of the world's driest deserts into a food production hub 80% of the planet's corals have suffered moderate or severe bleaching, shows unprecedented study In the Northeast, time is divided. The heaviest rain should be concentrated on the coast, especially between Paraíba and Pernambuco. João Pessoa (PB) and Recife (PE) are among the capitals with the greatest attention for heavy rain this Friday. It may also rain on stretches of the coast of Ceará and in isolated points in the north of Piauí and Maranhão. In the northeastern interior, dry weather continues to predominate, with heat and low humidity in areas such as the west of Bahia and the center-south of Piauí. Salvador (BA) should have a hot afternoon, with a maximum of 30°C. In the North, the heat and humidity maintain showers between the afternoon and evening in part of the region. The rain should hit areas of Roraima, Amapá, Pará, Amazonas and Acre, but in a more irregular manner. In Belém (PA), the maximum temperature should reach 32°C. Porto Velho (RO) should also have a hot afternoon, with 31°C. Even so, the forecast indicates that the rain is not likely to reach all areas: between part of central-north Espírito Santo and eastern Pará, the weather may become firmer throughout the day. 📱GloboPop: check out the Jornal Nacional stage on Globo's vertical video platform Rain is forecast across the country this Friday. CPTEC/Inpe Climate indicators are on red alert READ ALSO: Scientists discover geological formation in the Bermuda Triangle that could explain the region's mysteries Japanese sue government for climate inaction and ask for compensation It is #FAKE that the Amazon does not contribute to balancing the world's climate