Autumn in Pernambuco: rain and high temperatures are expected to mark the season | Latest:

The North and Northeast of the country tend to continue recording high temperatures over the next three months (Photo: Antonio Cruz/Agência Brasil)

Holy Week in Pernambuco was marked by rains that reached the Recife Metropolitan Region and Zona da Mata of State. After sunny days and temperatures exceeding 30º C at the beginning of the year, rain should begin to appear little by little due to the arrival of autumn, which lasts between March 20th and June 21st.

O fall occurs due to the equinox, a natural phenomenon in which the Sun is positioned directly at the equator line, in a rectilinear manner. This makes days and nights the same length of time. If the total day is 24 hours long, night and day would therefore each be 12 hours long.

Due to the fact that Brazil is located in the tropical zone of the planet, the characteristics of this season are more distributed, being more noticeable in the South and Southeast regions. Autumn is a transition phase between summer and winter and has characteristics of these two seasons, bringing changes in temperature, air humidity, volume of rain and winds.

“This issue of proximity to the Equator has to do with the lack of differentiation between the seasons in this tropical area. In this range where the North and Northeast regions of Brazil are located, due to the amount of incident energy from the Sun, the temperature does not decrease”, explains climatologist at the Pernambuco Agronomic Institute (IPA) and professor Francis Lacerda.

The North and Northeast of the country tend to continue recording high temperatures over the next three months, varying between 22º C and 32º C and higher rainfall rates. The rains are heaviest in areas closest to the Equator, which cuts through some states in Northern Brazil.

Autumn in Pernambuco

Despite the more frequent rain in the state, the heat is expected to continue (Photo: Fernando Fraz
Despite the more frequent rains in the state, the heat is expected to continue (Photo: Fernando Frazo/Agncia Brasil)

In Pernambuco, temperatures are expected to remain high over the next three months, but not as high as those recorded between January and the beginning of March. According to the meteorologist National Institute of Meteorology (INMET)Flaviano Fernandes, autumn should bring “rains in the normal to above normal category in the coastal and rural regions, and normal in other areas of the State”.

“The trend is that temperatures tend to decrease with the arrival of autumn. This is due to the Earth’s angle of inclination in relation to the Sun and the incidence of solar rays will gradually decrease in the Southern Hemisphere.”added the meteorologist.

Pernambuco and other states will experience a period of rain in the coming months due to the action of the Intertropical Convergence Zone (ZCIT) and the easterly winds that converge over these regions. According to INMET, this zone can be understood as a band of clouds that circles the entire globe in the equatorial region.

The Intertropical Convergence Zone descends to the Southern Hemisphere between the end of summer and the beginning of autumn, between the months of March and April, when it has greater influence in the northern part of the North and Northeast regions of Brazil. Even so, the system can also act in the months of February and May and cause a longer rainy period.

Despite more rain in the state, the heat is expected to continue and care should be taken with these two extremes in the coming months. According to climatologist Francis Lacerda, a heat wave that affects the entire planet has contributed to temperatures not decreasing.

“These heat waves have increased in the last 30 years and are related to the warming of the oceans, which we call ocean heat waves, which spread these hot waves towards the continent. We have a very high sea water temperature, 30ºC, and that is a very high temperature for a gigantic mass of water that is the ocean. In the past, we had on average, at most, five to seven heat waves and they increased to 75. We had, now in March, more than two heat waves”, completed.

To the Rainfall is expected to be below average historic fall in most of the North, Northeast and Midwest regions, especially due to the impacts that El Niño can still cause.

A difference in autumn 2024 is the final stage of the El Niño phenomenon, making there an 83% chance of registering this phenomenon in the quarters of April, May and June, according to the National Oceanic and Atmospheric Administration (NOAA).

O El Niño is characterized by the abnormal warming of the waters of the Pacific Ocean in the equatorial zone. The phenomenon occurs at irregular intervals of five to seven years and lasts between a year and a year and a half, starting in the last months of the year.

At the end of autumn, it is possible that the phenomenon La Nina start to form in Brazil, gaining strength in the second semester. La Niña is characterized by cooling of Pacific waters.

The article is in Portuguese

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