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In The Next 5 Days, The Warm Air Bubble Over Northern Argentina And Paraguay Raises Heat In The South, Southeast And Midwest, With Gradual Increase And Highs Near 40°C In Seven States; On Friday (6), The Cold Air Breaks Through RS And SC And Then Spreads.
A mass of warm air positioned over northern Argentina and Paraguay begins to push the heat into Brazil, creating a scenario of above-average temperatures in seven states with a chance of readings close to 40°C in areas more exposed to warming.
The increase tends to be gradual over the next few days, with the strongest peak expected on Thursday (5). Starting on Friday (6), the advance of cold air changes the dynamics, first lowering temperatures in Rio Grande do Sul and Santa Catarina and, over the weekend, broadening the relief to other affected areas.
What Is Behind The Warm Air Bubble That Reinforces The Heat
The so-called warm air bubble is, in practice, a atmospheric configuration that favors persistent warming, because it keeps the air more “trapped” over a large region. When this air becomes more stable, the vertical mixing decreases, the ventilation loses strength and the sun is able to warm the ground for longer, fueling the heat day after day.
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Another important point is the behavior of the air in higher layers: when there is subsidence, the air tends to descend and warm, which hinders the formation of more extensive clouds and reduces the natural “brake” that cloudiness usually imposes on highs. The result is a cycle in which heat sustains itself for several days, with a gradual increase until the peak.
The indication is that thermometers may stay 3°C or more above the average during the period, which helps explain why the feeling of heat may seem “out of season” or simply above what the body is used to.
At the same time, this does not mean that every city will break records: the bubble increases the potential for heat, but local details, such as relief, wind, and cloud cover, define where the peak actually gets closer to 40°C.
Where The Heat May Intensify The Most In The Next Five Days
The area most directly affected includes seven states, with emphasis on Rio Grande do Sul, Santa Catarina, Paraná (mainly the Northwest), Mato Grosso do Sul, Mato Grosso (in the southern strip), and also the extreme west of São Paulo and Minas Gerais, in the Alto Paranaíba region.
This is a segment that combines the interiorization of warm air and greater ease of heating, especially away from the moderating influence of the ocean.
Within these states, the tendency is for heat to assert itself more strongly where the wind circulation does not “renew” the air efficiently and where the stability pattern keeps the sky less cloudy.
Therefore, very specific areas emerge, such as the Northwest of Paraná and the extreme west of São Paulo and Minas Gerais: these are bands where warm air tends to spread with less resistance when the mass advances.
It is also worth recalling that the impact is not only in the thermometer reading: heat weighs on routine when combined with the urban environment, heated asphalt, and less heat loss at night.
Even without dramatic changes in each neighborhood, the combination of several hot days tends to increase discomfort, elevating the perception of stuffiness and the fatigue typical of longer heat waves.
How The Heat Escalation Happens Until Thursday (5)
The described scenario is of gradual escalation, and this is a key detail: instead of a single leap, heat intensifies like a “ramp,” day by day, until reaching the critical point on Thursday (5).
This behavior is common when the same warm air mass continues to dominate the region, allowing the ground and urban surfaces to accumulate thermal energy.
On Thursday (5), the greatest chances of highs near 40°C are expected in more sensitive spots within the seven listed states. It is the day when the heat tends to be more “organized” and widespread, precisely because the pattern will have had time to settle and mature, expanding the area with above-average temperatures.
To follow this escalation without surprise, the best approach is to observe the daily trend, rather than just an isolated value.
A practical indicator is to notice if afternoons become progressively hotter and if nighttime relief diminishes: when the sequence of less refreshing nights occurs, the body feels the heat more the next day, even if the high rises little from one day to the next.
When The Cold Air Arrives And Why The Heat Loses Strength First In The South
The change begins on Friday (6), when a mass of cold air advances through Brazil and alters circulation. The forecast indicates that Rio Grande do Sul and Santa Catarina will be the first to feel the effect, with a faster drop in temperature in these areas. This “first impact” in the South is the signal that the bubble begins to break at the edge.
Meanwhile, other areas may still remain very hot, notably Mato Grosso do Sul, where temperatures may remain close to 40°C even after the onset of the cold air advance. That is, the transition is not simultaneous: heat loses strength in stages, and each region “turns the switch” at a different time.
Between Saturday (7) and Sunday (8), the expectation is that the cold air will advance further and cause a broader drop in temperatures, ending the heatwave in the remainder of the affected areas. It is the phase in which the sense of relief tends to spread, replacing the sequence of very hot afternoons with a milder pattern and less persistent heat.
What To Do To Get Through The Heat With More Safety In Daily Life
In such periods, the most effective approach is to reduce exposure during the hottest hours and adapt the day’s rhythm. Frequent hydration, breaks in the shade, light clothing, and ventilated environments make a difference, especially when the heat is accumulated over several days.
If there are outdoor activities, it’s best to prioritize the morning and late afternoon when the thermal load tends to be lower.
It also helps to think about who feels the heat more: children, the elderly, and people working in exposed areas tend to suffer first from the sequence of hot days.
In daily life, small decisions, such as avoiding leaving people and animals in closed cars and reinforcing ventilation at home, usually have an immediate impact on comfort and safety.
With the arrival of cold air, the turnaround can be quick in some regions, especially in RS and SC, and this requires attention to the contrast: organizing clothing, adjusting schedules, and not underestimating the change helps to get through the weekend without a “sudden” break in routine.
The heat departs in phases, so tracking the daily trend is as important as looking at the day’s high.
In your state, has the heat already begun to change the routine, or is it still in that gradual rise phase? Do you feel the weight more at the peak on Thursday (5) or during the turnaround with the cold air on Friday (6) and over the weekend?
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