Two cyclones will sweep across ten states in a single week
Twice in a single week, the atmosphere over southern Brazil is gathering itself into extratropical cyclones — a rare doubling of meteorological force that will touch ten states from Monday through Friday. The first system, born over Rio Grande do Sul, will mature and move offshore by Tuesday; the second, forming between Mato Grosso do Sul and Paraguay, will peak Thursday before following the same path to sea. Together, they carry rainfall that exceeds what early June typically asks of this land, a quiet reminder that the boundary between autumn and winter in Brazil is not always a gentle crossing.
- Two extratropical cyclones forming within days of each other is an unusual meteorological event for early June, compressing a season's worth of disruption into a single week.
- Wind gusts up to 60 km/h, heavy thunderstorms, and rainfall totals above seasonal norms threaten communities across the south, southeast, and central-west — ten states in all.
- The second and more powerful system peaks Thursday, raising severe storm alerts across a broad arc from Rio Grande do Sul to São Paulo and into Mato Grosso, demanding active monitoring from residents and authorities alike.
- Meteorologists are tracking both systems closely, with the expectation that each will move offshore by Friday — but not before leaving accumulated rainfall that could surpass what the region normally sees this time of year.
Brazil is preparing for an unusually turbulent week as two extratropical cyclones take shape in quick succession, set to sweep across ten states between Monday and Friday.
The first system has already announced itself. A trough of low pressure moved through Rio Grande do Sul and Santa Catarina on Sunday, scattering showers across both states. By Monday it will intensify over Rio Grande do Sul, thickening cloud cover across the state and spilling into parts of Santa Catarina and Paraná. Light to moderate rain and afternoon thunderstorms are expected. By Tuesday the cyclone will be fully formed, its center sitting over the ocean — and though classified as weak, it will still drive winds near 60 km/h before gradually releasing its grip on the south.
Even as the first system retreats, a second area of instability is already developing between Mato Grosso do Sul and Paraguay. By Tuesday, southern Mato Grosso do Sul will be under rain watches. Wednesday brings the convergence: a new zone of instability stretches across the center-south, delivering heavy rain to southern Mato Grosso do Sul, northwestern Paraná, and western São Paulo, with precipitation pushing northward through the night.
Thursday marks the second system's peak. A broad arc of states — from Rio Grande do Sul and Santa Catarina through Paraná, São Paulo, Mato Grosso do Sul, and southern Mato Grosso — faces amplified rainfall and the threat of severe thunderstorms. The system finally shifts offshore Friday, completing its transformation into the week's second extratropical cyclone. From the ocean, it continues to shape conditions across the center-south, bringing intense rain to coastal and eastern zones and lighter precipitation as far as Rio de Janeiro and Minas Gerais.
When the week closes, all ten states will have felt both systems pass through. Accumulated rainfall is expected to exceed seasonal norms — a quiet but forceful reminder that Brazil's early winter carries surprises of its own.
Brazil is bracing for an unusually active week of weather. Two separate extratropical cyclones will sweep across ten states between Monday and Friday, bringing wind gusts, heavy rain, and the risk of severe storms to swaths of the country's south, southeast, and central-west regions. Meteorologists expect rainfall totals to exceed what is typical for early June across much of this territory.
The first system is already taking shape. What began as a trough of low pressure moved across Rio Grande do Sul and Santa Catarina on Sunday, delivering scattered showers to both states. By Monday, this disturbance will intensify directly over Rio Grande do Sul's territory. Cloud cover will thicken across the southern, central, northern, and eastern portions of the state. Parts of Santa Catarina's center-east and Paraná's east will also see the sky darken. Light to moderate rain is expected throughout these three states, with thunderstorms possible by late afternoon.
By Tuesday, the first cyclone will be fully formed, its low-pressure center sitting out over the ocean. Though classified as weak in intensity, it will still pack a punch—winds could reach 60 kilometers per hour in affected areas. The system will draw moisture from the region, which should actually reduce rainfall in the south somewhat. But even as this first cyclone begins to move away, a second area of instability is already developing between Mato Grosso do Sul and Paraguay, destined to become the week's second extratropical cyclone.
Mato Grosso do Sul will already be under rain watches by Tuesday, with moderate to heavy precipitation forecast especially across the state's southern half. The real convergence comes Wednesday. A new zone of instability will gain strength over the center-south, stretching across the southern, southeastern, and central-western regions. Heavy rain is predicted for southern Mato Grosso do Sul, northwestern Paraná, and western São Paulo. As night falls, the rain will push northward into central and northern Paraná, and into the center-south of São Paulo state.
Thursday marks the peak of the second system's impact. The low-pressure area intensifies over Brazil's center-south, amplifying rainfall and raising the threat of severe thunderstorms across a broad swath: northern and northwestern Rio Grande do Sul, western Santa Catarina, western and northern Paraná, western, central, and northern São Paulo, plus Mato Grosso do Sul and southern Mato Grosso. These conditions persist into Friday, when the system finally shifts offshore and completes its transformation into the second extratropical cyclone of the week.
Once established over the ocean, this second cyclone will influence much of the center-south. Its configuration will favor intense rainfall in the east of Rio Grande do Sul, the center-east of Santa Catarina, the east of Paraná, and across the northern, central, and eastern portions of São Paulo. Lighter rain is expected in Rio de Janeiro, the center-south of Minas Gerais, and the Triângulo Mineiro region. The system's cold front will also trigger instability in southern Goiás, northern Mato Grosso do Sul, and center-south Mato Grosso.
By week's end, all ten states will have felt the influence of both meteorological systems. The accumulated rainfall across the affected zones is expected to run above seasonal norms for this time of year—a reminder that early winter in Brazil can deliver surprises.
Citações Notáveis
The first cyclone will be weak in intensity but will draw moisture from the region, reducing rainfall in the south— Meteored meteorological service
A Conversa do Hearth Outra perspectiva sobre a história
Why do two cyclones arrive in the same week? Is that unusual?
It's not impossible, but it's notable enough that meteorologists are tracking it carefully. The first one is already forming from a trough of low pressure. The second develops independently, from a separate system building between Mato Grosso do Sul and Paraguay. They're not connected—just bad timing.
What makes an extratropical cyclone different from a tropical one?
Extratropical cyclones form in the mid-latitudes, where cold and warm air masses collide. They're the storms of temperate regions. Tropical cyclones need warm ocean water and form near the equator. Brazil's getting the mid-latitude kind this week.
The forecast mentions winds up to 60 kilometers per hour. Is that dangerous?
It's strong enough to cause problems—tree damage, power outages, rough seas. Not catastrophic on its own, but combined with heavy rain and thunderstorms, it creates hazardous conditions. People will need to be cautious.
Why does the first cyclone reduce rainfall in the south even though it's a rain-bearing system?
Because it's weak and it pulls moisture away from the land as it moves over the ocean. The second system is the real rain-maker—that's where the heavy accumulation happens, especially midweek.
Ten states is a lot of territory. How many people are we talking about?
The source doesn't specify population figures, but these are some of Brazil's most densely settled regions—São Paulo, Paraná, Rio Grande do Sul. Millions of people will experience this weather. That's why the forecast matters.
What should people in these states actually do?
Monitor the forecast through Friday. The heaviest rain and storm risk peaks Thursday. In flood-prone areas, that's when vigilance matters most. Power outages are possible. It's not a catastrophe in the making, but it's weather that demands attention.