Autumn starts at 12:33 pm this Sunday (20), nationwide, and runs until June 21. The season has intermediate characteristics to those of summer and winter, marked by a drop in temperatures and a reduction in the volume of rainfall. See how the weather will be in the period in each region of the country.
North region
The forecast is for above-average rains in the North Region, especially in the northeast of Pará and northwest of Amazonas, and an increase in the temperature of the waters near the northeast coast, points out the National Institute of Meteorology (Inmet), when preparing a prognosis on the forecast. climate of the five regions of Brazil
In the eastern northeast, the forecast is for a gradual increase in rainfall between the autumn and winter seasons, due to the evolution of the Eastern Wave Disturbances (DOL). According to Inmet, temperatures will remain close to and above average in the region, except in the northern part of the states of Maranhão, Piauí and Ceará, where temperatures may be milder.
Midwest
In the Midwest, rainfall should occur within normal to below the climatological average in most of the region, except in the central and eastern parts of Mato Grosso, where there is a possibility that rains are more frequent in the month of April.
Southeast region
Rainfall is expected to remain below average for the next three months in the Southeast Region. Normally, this period already experiences a drop in the volume of rainfall.
South region
The climate forecast for the South Region, on the other hand, indicates that rainfall will be below average in most of the three states, as a result of the impacts of the La Niña phenomenon. However, cold fronts may enter, causing rain, especially in the eastern portion of the region, as winter approaches.
next months
From May onwards, the driest period begins in the central area of the country. Inmet projects above-average temperatures throughout the region, with the exception of eastern Mato Grosso do Sul, where predicted temperatures may decline over the autumn months.
The air temperature should prevail close to and slightly above the climatology of the period, but Inmet does not rule out the possibility of the entry of cold air masses that may decrease temperatures in higher altitude locations, starting in May.
“It is noteworthy that, during autumn, the first formations of adverse phenomena are usually observed, such as: fog in the South, Southeast and Center-West regions; frosts in the South and Southeast regions and in Mato Grosso do Sul; snow in the mountainous areas and plateaus of the South Region, and cold in the south of the North Region and in the states of Mato Grosso do Sul, Mato Grosso and even in the south of Goiás”, informs Inmet’s Climate Prognosis for the period.
understand the season
Autumn in the Southern Hemisphere begins with an equinox, between the 20th and 21st of March every year.
During the period, according to the National Institute of Meteorology, rains are scarcer, especially in the interior of Brazil, including the semi-arid northeast. The coastal parts of the Northeast and the Amazon Region still register a considerable amount of rainfall, especially if there is persistence of the atmospheric system called Intertropical Convergence Zone (ITCZ) further south of its range.
The new season is also characterized by the first incursions of cold air masses, coming from the south of the continent, which cause a gradual drop in temperatures, mainly in the southern states and in parts of the Southeast region.
Other marks of this season are a greater drop in relative humidity and an increase in the incidence of winds.
The arrival of autumn is linked to an astronomical phenomenon called the equinox, which marks the exact moment when the sun is positioned perpendicular to the equator, distributing its luminosity more or less uniformly between the southern and northern hemispheres, the which takes place exactly on this March 20th.
From that moment, due to the Earth’s translational movement in relation to the sun, one of the hemispheres begins to receive more solar luminosity than the other. This is because the Earth has a slight inclination in relation to its axis and, as it moves around the sun (translation), this incidence of solar rays is inverted between the North and South parts of the planet.
That’s why when autumn begins in the Southern Hemisphere, transitioning to winter, spring begins in the Northern Hemisphere, transitioning to summer.
Source: CNN Brasil
