A low-pressure system forming a cyclone will bring rain to multiple states in Brazil’s Center-South region today, with heavy downpours and isolated thunderstorms possible in some areas.

Did You Know? The cyclone’s strongest winds—around 100 km/h—are expected to remain over open ocean, far from the coast, with only a few southern coastal areas possibly seeing gusts of 50–60 km/h this weekend.

Which States Are Affected?

Rain is already reaching parts of Rio Grande do Sul’s West, Northwest, and North regions by morning. By afternoon, the system will intensify, spreading precipitation across most of the state, though the far south—including Chuí—may see little to no rain.

In Santa Catarina, rain will affect multiple regions, with the West and Meio-Oeste seeing the most instability. Paraná will experience widespread rain, with moderate to heavy downpours and a chance of isolated thunderstorms. In the Southeast, São Paulo will see rain throughout the day, with localized moderate to heavy showers and a low risk of brief, isolated thunderstorms.

Minas Gerais will have irregular rain, reaching the Triângulo Mineiro, southern regions, parts of the Center, and the East. The state of Rio de Janeiro will also see scattered rain. In the Center-West, isolated showers are possible in the West and South of Mato Grosso do Sul, as well as in parts of southern Goiás and localized areas of Mato Grosso.

How Severe Will the Rain Be?

Most cities in Rio Grande do Sul are expected to receive between 10 mm and 30 mm of rain, though some areas could see accumulations near or above 50 mm by tomorrow as the cyclone continues to develop.

In Paraná, rain volumes will be higher than in Rio Grande do Sul, with moderate to heavy showers in many areas. The risk of isolated thunderstorms remains, though they are expected to be brief and localized.

What About the Cyclone’s Impact on the Coast?

The cyclone is not expected to pose significant risks to coastal areas. While winds of around 100 km/h will stay near the system’s center over open water, a few southern coastal points could experience gusts of 50–60 km/h this weekend—well below thresholds for structural damage.

Ciclone extratropical e frente fria atingem parte do Brasil!

The system will also push a cold front, leading to a temperature drop over the weekend.

Expert Insight: Cyclones like this one typically bring rapid weather shifts, but their impact depends on how quickly the low-pressure system deepens. The current forecast suggests the strongest winds will remain offshore, reducing coastal risks. However, localized heavy rain could still lead to localized flooding in low-lying areas, particularly in Paraná and Rio Grande do Sul.

What’s the Outlook for the Weekend?

While the cyclone itself is not expected to cause major disruptions, the associated cold front could bring cooler temperatures across the affected regions. Residents in areas expecting heavy rain should monitor local forecasts for potential flash flooding risks.

Frequently Asked Questions

Will the cyclone cause damage?

No significant damage is expected. The strongest winds will remain over open ocean, and coastal gusts of 50–60 km/h are unlikely to cause structural harm.

Which areas are most at risk for heavy rain?

Some parts of Rio Grande do Sul, Paraná, and São Paulo could see accumulations near or above 50 mm, though most areas will receive between 10 mm and 30 mm.

Should I expect thunderstorms?

Isolated thunderstorms are possible, particularly in Paraná and parts of São Paulo, but they are expected to be brief and localized.

With heavy rain expected in some areas, how can residents prepare for potential flooding?