Spring officially begins in the southern hemisphere today, February 22, in the late afternoon. According to experts, the so-called Spring Equinox will begin at 4:21 p.m. on Wednesday and end at 12:59 p.m. on December 21st, with the beginning at 4:21 p.m. and the ending at 12:59 p.m. A period of year when sunlight reaches both hemispheres of the globe with equal intensity, resulting in days and nights that have the same length of 12 hours, is the autumnal equinox, which occurs every year on September 22nd.
According to astronomer Marcelo De Cicco, it is because of the accumulation of information in Fundamental Astronomy, also known as Astrometry, that scientists are able to calculate with such accuracy the exact moment when the seasonal event happens.
“We now have equations and computing methods that allow us to calculate the precise motion of the Earth to within tenths of a second of its centre of mass. According to a researcher from the National Institute of Astronomy, “by taking into account the tilt of Earth’s axis and the fact that the Earth’s orbit around the Sun is not perfectly circular, it is possible to determine the exact day and time of the equinoxes and solstices [a time when the distribution of solar luminosity around the globe is not uniform, that is, in summer and winter]”.
La Nia, a natural climatic event characterised by the chilling of surface waters in the Equatorial Pacific Ocean, is likely to have an impact on the so-called Estaço das Flores in Brazil. La Nia is defined as a cooling of surface waters in the Equatorial Pacific Ocean.
As predicted by meteorologists at the National Institute of Meteorology (Inmet), the phenomenon will be brief and not very intense. Nonetheless, it is expected to have an impact on the regularity of rainfall in certain locations. “We are expecting [the occurrence of] La Nia during the spring, but it should be of short duration and not very intense”, said Márcia dos Santos Seabra, the coordinator of Applied Meteorology, Development, and Research at Inmet, during a virtual event on the climate perspectives for the season held yesterday (21), in which she shared her predictions for the season’s climate.
Rain is expected to return to parts of the Midwest Region in the coming days, according to Inmet’s weather forecast, which was released on Monday (20). This will be notably true in north-central Mato Grosso and the mid-west of Goiás, according to the forecast. There is, however, no rain anticipated in Matopiba before October 6, a region that includes the states of Maranho, Tocantins, Piaui, and Bahia and is an important national agricultural breadbasket, according to the National Weather Service.
The National Meteorological Service (Inmet) predicts the intensification of rain in the North and South regions, as well as in the Southeast of Minas Gerais and in practically the entire Southeast region, where rainfall has already been occurring in an irregular manner since the beginning of the month. The emergence of cold fronts in the southern region should make it more likely that regular showers will be experienced.
Even though it is raining again in parts of the Midwest region, minimum temperatures are expected to rise in the following days, primarily in Mato Grosso, Mateiros do Sul, and Goiás provinces, according to Inmet. Throughout the Northern Hemisphere, the coldest temperatures will range between 22°C to 28°C.
The lowest temperatures, on the other hand, are expected to occur in the South and Southeast regions between today and tomorrow, and will continue until the 27th (23). While temperatures in some parts of Santa Catarina and Rio Grande do Sul may fall below 8°C, the lowest temperatures in the Southeast should be concentrated in areas such as the southeast of Minas Gerais, the central-east of So Paulo, and some parts of Rio de Janeiro, where they should reach 16°C. In the South, temperatures may fall below 8°C in some parts of Santa Catarina and Rio Grande do Sul.
Climatempo stated that, as a result of La Nia, spring rainfall in the northern hemisphere should be more than usual, despite the fact that the region has typically received less rainfall during the season. It is expected that the Southeast, Midwest, and, primarily, Northern Brazil would experience an increase in the frequency and volume of rain throughout the months of October and November. Water scarcity will continue to worsen despite rain reaching critical locations for reservoir supply. The amount of rain falling will not be sufficient to bring the situation back into balance.
As a result, we expect temperatures to be above average in almost all of Brazil, with the exception of a few regions, such as the center-south of Mato Grosso do Sul and northwestern Pará. Temperatures are expected to be above average in the center-south, north, and a small strip of central-western Brazil.” In the meanwhile, following multiple rainy seasons with below-average rainfall, a single period of above-average rainfall would not be enough to rectify things “, according to meteorologist Filipe Pungirum, who spoke on the podcast O Clima Entre Nós, which was produced by Climatempo.