Cyclogenesis causes a sudden change in weather in the South of Brazil with the formation of an extratropical cyclone between Argentina and Uruguay, bringing rain, thunderstorms, strong winds, and widespread instability throughout this Thursday (16).

Written by Felipe Alves da Silva

Published on 16/04/2026 at 03:41

Updated on 02/05/2026 at 15:58

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Intense atmospheric phenomenon completely changes the climatic scenario and puts several regions on alert with a forecast of rain throughout the day, as well as variations in the sky and the possibility of thunderstorms in different cities

Thursday (16) begins with a scenario of significant change in weather conditions in the South of Brazil. This information was released by MetSul Meteorologia, which monitors the formation of an atmospheric system that promises to completely alter the climate throughout the day.

This is a process known as cyclogenesis, which is underway between Argentina, Uruguay, and the South of Brazil. This phenomenon gives rise to an extratropical cyclone, responsible for causing instability, increased cloudiness, and large-scale rainfall episodes.

How cyclogenesis is impacting the south of Brazil and rapidly changing the weather

According to meteorological data, the extratropical cyclone is moving southeastward this Thursday (16), starting from the northeast of Argentina towards Uruguayan territory. Early in the day, the system will already be positioned in western Uruguay, advancing towards the east of the country by the end of the day.

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Detailed forecast indicates rain since the early morning and advancement of instability throughout the day

In the gaucho territory, the forecast indicates a day marked by abundant cloudiness and rain distributed throughout the day. In fact, there are already reports of precipitation since the early morning and during the morning in most of the state.

At the same time, instability moves from west to east, which favors the occurrence of thunderstorms in some cities. Thus, by the end of Thursday, all regions of Rio Grande do Sul should register rain at some point.

Despite this, precipitation volumes are not expected to be extremely high in most municipalities. This happens because the intensity of instability tends to be lower compared to neighboring areas, such as Argentina and Uruguay. Still, moderate to heavy rain in isolated spots cannot be ruled out.

On the other hand, even with the predominance of clouds and instability, breaks in the weather may occur throughout the day. This behavior is explained by the rotation of the low-pressure area and the infiltration of dry air in northern Argentina, which may allow for moments of improvement, especially during the afternoon.

Friday will have a different scenario with sunshine and irregular rain in some areas

On Friday, the scenario begins to change again. With the extratropical cyclone positioned off the coast of Uruguay, the sun returns to appear accompanied by clouds in various regions of Rio Grande do Sul.

However, despite the partial improvement, periods of greater cloudiness are still expected throughout the day. In addition, there is a forecast of isolated rain or drizzle in different parts of the state, although in a quite irregular manner and with low volumes in most areas.

Another important factor is the wind, which is expected to gain intensity, especially in the Southern Coast, where gusts of moderate to strong winds are expected by the end of the day.

Cyclogenesis causes a sudden change in weather in the South of Brazil with the formation of an extratropical cyclone between Argentina and Uruguay, bringing rain, thunderstorms, strong winds, and widespread instability throughout this Thursday (16).

Intense atmospheric phenomenon completely changes the climatic scenario and puts several regions on alert with a forecast of rain throughout the day, as well as variations in the sky and the possibility of thunderstorms in different cities

How cyclogenesis is impacting the south of Brazil and rapidly changing the weather

Detailed forecast indicates rain since the early morning and advancement of instability throughout the day

Friday will have a different scenario with sunshine and irregular rain in some areas

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Cyclogenesis causes a sudden change in weather in the South of Brazil with the formation of an extratropical cyclone between Argentina and Uruguay, bringing rain, thunderstorms, strong winds, and widespread instability throughout this Thursday (16).

Intense atmospheric phenomenon completely changes the climatic scenario and puts several regions on alert with a forecast of rain throughout the day, as well as variations in the sky and the possibility of thunderstorms in different cities

How cyclogenesis is impacting the south of Brazil and rapidly changing the weather

Detailed forecast indicates rain since the early morning and advancement of instability throughout the day

Friday will have a different scenario with sunshine and irregular rain in some areas

An extratropical cyclone with unusual behavior is moving from Argentina to the Atlantic, causing an intense ‘thermal seesaw’ in the South of Brazil, with storms, temperatures above 30°C, cold below 10°C, and a difference of up to 15°C in the same day.

While an average building in London or New York takes three years to be completed, in China a 26-story tower went up in five days with about 100 workers, and the global modular construction market already moves US$ 95 billion per year.

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Goodbye traditional washing machine: Panasonic surprises housewives with the NA-G5 featuring four drums, a 13 kg washer and dryer, a 12 kg dryer, independent mini washers, a heat pump, and a 4-in-1 system awarded at the German Design Award.

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