The La Niña weather phenomenon is expected to cause consecutive days of rain in several regions of the country this summer.
Summary
Summer in Brazil begins on December 21, marked by the La Niña phenomenon, which is expected to cause intense rains in several regions, while some areas will experience above-average heat.
The time of year most awaited by tourists who love sun and beaches is approaching: summer. The hottest season officially begins on December 21, and many Brazilians are already wondering when the intense heat will arrive. According to the National Institute of Meteorology (Inmet)the answer is not so simple, mainly due to the influence of the phenomenon La Nina.
Inmet said next summer is expected to be marked by heavy rains and the formation of South Atlantic Convergence Zone (ASCZ)a large band of cloudiness responsible for causing continuous rain for at least four consecutive days.
Regions expected to face more storms are the Central-West and North regions, with total values between 700 and 1,100 mm. The South-Eastern regions and part of the North-Eastern regions should also be impacted. The southern region tends to experience a drier period.
Which regions will have above average heat
While some regions will experience rainy days, others are expected to record above-average temperatures, with several sunny days even in the middle of the rainy season, a typical scenario for the so-called summer season.
Although it is still too early to confirm the onset of these dry periods, Inmet points out that in principle the regions most prone to heat are: the South region, Mato Grosso do Sul and the northeastern hinterland.
In these areas, where rain tends to be less frequent at this time of year, the more open skies favor a significant increase in temperatures.
Between January and February, when summers are historically more common, there can be consecutive days of clear skies and intense heat, especially in regions with tropical climates. This scenario increases the alert for respiratory diseases and fires.
The intensity of the heat will depend on the evolution of the rainy season and the frequency of these dry periods throughout the summer.
La Niña will have a stronger effect in summer
The La Niña phenomenon was confirmed this spring and intensified precipitation over the period. It typically takes about three months to fully impact Brazil’s climate and, if it persists through the summer, it is expected to enhance precipitation and increase the frequency of SACZ episodes in central and southeastern Brazil.
The most likely scenario is therefore a rainier summer in these regions and, therefore, with moderate heat during prolonged periods of cloudiness.
The tornadoes that devastated the towns of Paraná are reclassified as F4, with winds of up to 418 km/h:
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