EN 
PT_BR 
The mass of cold air advancing through the South-Central region of Brazil will cause a sharp drop in temperatures this Friday (21) and Saturday (22), with minimum temperatures close to 0°C in the mountainous areas of the Southern Region and the possibility of frost. According to the forecast released by the National Institute of Meteorology (Inmet), the cold will also reach Mato Grosso do Sul and parts of the Southeast, while intense winds will hit coastal areas and the main rains will be concentrated in the North.
The change occurs after the passage of a cold front. Behind the system, a mass of dry, cold air reduces temperatures, mainly in the southern states. On Saturday, the mountain ranges of Rio Grande do Sul and Santa Catarina may register minimum temperatures of 0°C.
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Cold air mass increases risk of frost in the South.
The cold will be more intense in the Southern Region. On Friday morning, Rio Grande do Sul will still have many clouds and isolated showers across much of the state. Santa Catarina and southern Paraná will start the day with more cloud cover.
During the afternoon, the arrival of cold, dry air will favor clear skies across much of the region, with mostly sunny weather and few clouds. Cloud cover will remain between Rio Grande do Sul and the southern coast of Santa Catarina, but no rain is expected.
On Saturday, the cold intensifies. According to Inmet, there is a possibility of frost in much of Rio Grande do Sul and Santa Catarina, as well as in south-central Paraná. Early morning fog may still be present in eastern Paraná and Santa Catarina.
Among the capital cities, Porto Alegre is expected to register a low of 7°C on Saturday and a high of only 13°C. In Florianópolis, the predicted high is 21°C this Friday, dropping to 16°C on Saturday.
In the mountainous areas of Rio Grande do Sul and Santa Catarina, minimum temperatures may reach 0°C. In southern Paraná, temperatures should be around 3°C.
In north-central Paraná, there is a yellow warning indicating a potential danger due to low air humidity during the afternoon of this Friday.
Southeast regions will experience cold weather in the mountains, and a warning is in effect for strong winds along the coast.
The arrival of colder air is also altering weather conditions in the Southeast. São Paulo, southern Minas Gerais, and Rio de Janeiro will wake up to mostly cloudy skies this Friday morning. Showers are forecast for eastern São Paulo state and the city of São Paulo itself.
In the afternoon, cloud cover increases between eastern São Paulo, southern Minas Gerais, and Rio de Janeiro, with a possibility of isolated showers. During the night, the instability will be concentrated mainly in Rio de Janeiro and on the border with Minas Gerais.
In addition to the rain, Inmet (National Institute of Meteorology) points to a risk of strong winds on the coast. There is an orange warning for dangerous gales on the northern coast of São Paulo, including Caraguatatuba, Ilhabela and Ubatuba, and along the entire coast of Rio de Janeiro, including the capital city.
A yellow warning of potential danger from strong winds covers the remaining coastal areas of the Southeast, from the southern coast of São Paulo to the north of Espírito Santo.
On Saturday, Espírito Santo will have many clouds and a chance of isolated showers. The coast of São Paulo may start the day with fog. There is also a possibility of frost in southern Minas Gerais and in the mountainous regions of São Paulo.
Temperatures are declining in parts of the region. The lowest temperature among the capital cities will be 11°C in São Paulo on Saturday. In southern Minas Gerais and the mountains of São Paulo state, temperatures could reach around 4°C.
Despite the cold front approaching, Belo Horizonte and Rio de Janeiro may still reach highs of 33°C this Friday.
Mato Grosso do Sul will have a minimum temperature close to 7°C.
The impact of the cold air mass will also be felt in the Midwest, mainly in Mato Grosso do Sul and south-central Goiás.
Ponta Porã, in Mato Grosso do Sul, may register a minimum temperature of around 7°C. In the Corumbá region, the forecast indicates a minimum of 10°C. Among the capital cities, Campo Grande may reach 13°C, while Goiânia and Brasília will have minimum temperatures close to 14°C.
This Friday, Campo Grande will have a high of up to 25°C. In contrast, areas in northeastern Mato Grosso and northwestern Goiás could reach between 39°C and 40°C.
This Friday morning will still see isolated showers and thunderstorms in the central-west of Mato Grosso do Sul, as well as a possibility of rain in the north and northwest of the state. The trend, however, is for cloud cover to decrease throughout the day.
On Saturday, the forecast indicates few clouds across the entire Central-West Region and no rain.
Inmet maintains an orange warning for dangerous low air humidity in northern and eastern Mato Grosso, much of Mato Grosso do Sul and Goiás, and the Federal District. The remaining areas of the region are under a yellow warning for potential danger.
Northern Brazil maintains temperatures close to 40°C and rain in the Amazon.
While the cold front moves through the South-Central region, the heat remains intense across much of the North region.
This Friday, the main instability will be concentrated in Acre, Amazonas, and Roraima. The day will begin with rain and thunderstorms in west-central Acre, western and northwestern Amazonas, and northern Roraima.
During the afternoon, the rains will move over other areas, including northwestern Pará and Amapá. At night, the instability will persist, especially in western Acre, western and northern Amazonas, and Roraima.
On Saturday, rain and thunderstorms will intensify in northwestern Amazonas. Showers are also expected in western Acre, western and northern Amazonas, and Roraima.
The heat will continue to prevail. Palmas could reach 39°C, while southeastern Amazonas and southern Pará will have highs close to 40°C.
Temperatures will be milder in eastern Acre, with a low of 20°C forecast for Rio Branco on Saturday.
There is an orange warning for dangerous low humidity in southern Pará and south-central Tocantins, including Palmas. Other areas of Tocantins, Pará, and eastern Amazonas are under a yellow warning.
Northeastern Brazil will experience heat inland and isolated rain along the coast.
In the Northeast, most of the interior will continue to experience stable weather, sunshine, and few clouds. Coastal areas will have more cloud cover and a chance of rain.
This Friday, isolated rain is expected along the northern coast of Bahia, Sergipe, Alagoas, and Pernambuco. During the afternoon, the possibility of rain remains in these areas and also extends to the coast of Maranhão.
On Saturday, cloud cover will continue along the coast, with isolated showers expected on the coast of Bahia and the southern coast of Sergipe.
In the mountainous areas of the interior of Bahia, the early mornings may register temperatures as low as 11°C. In the higher regions of Pernambuco, the minimum temperatures reach 14°C.
In contrast, the heat remains intense during the afternoons in the interior. Thermometers can reach 38°C in Piauí, eastern Ceará, and western Rio Grande do Norte and Bahia.
Among the capital cities, São Luís and Teresina could reach 33°C. Salvador will have milder temperatures, between 23°C and 27°C, due to the greater presence of clouds.
Inmet also issued an orange warning for low humidity in southern Piauí and western Bahia. There is also a yellow warning for areas of Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, and Bahia. On the southern coast of Bahia, the alert is for potential danger of strong winds.
With the advance of the cold air mass, the temperature contrast will be accentuated between Brazilian regions this weekend. While mountainous areas in the South may reach 0°C and register frost, parts of the North and Midwest could reach temperatures close to 40°C.
