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September is expected to begin with a significant shift in Brazil's weather patterns, according to data released by Meteored. Forecasts indicate above-average rainfall and a higher frequency of cold fronts over much of the South, Southeast, and Central-West regions, as well as temperatures at or below average due to the advance of cold air masses.\n<\/p>\n
The change starts to gain momentum this week, with the action of a new cold front and a low pressure area over the Center-South of Brazil. According to data released by Meteored, instabilities should increase from Wednesday (26), while the cold front reaches the Southern Region on Thursday (27).<\/p>\n
Between Thursday (27) and Friday (28), the risk of storms increases mainly in Rio Grande do Sul, with the possibility of heavy rain also in Santa Catarina. At the same time, a trough favors rain showers in the Southeast, especially in Minas Gerais, S\u00e3o Paulo, Rio de Janeiro and Esp\u00edrito Santo.<\/p>\n
The cold front is expected to gain strength over the next weekend. The system should move through Santa Catarina and Paran\u00e1 and subsequently reach Mato Grosso do Sul and S\u00e3o Paulo. With this advance, the change in weather should reach a wider area of the Central-South region, increasing the occurrence of rain and storms.\n<\/p>\n
According to data released by Meteored, the scenario predicted for this week may mark the beginning of a change that is likely to persist throughout the month of September. In the first week of the month, the trend is for very rainy weather in most of the Central-South region of the country. A wide area, especially in the South, Southeast, and Central-West regions, is expected to experience heavy rainfall.<\/p>\n
The forecast also indicates the possibility of above-average rainfall in parts of the North and Northeast regions, although the focus remains on the South-Central region. This pattern of more frequent precipitation may continue throughout the month of September, according to climate forecasts presented by Meteored.<\/p>\n
Among the factors associated with the change in the pattern is the Antarctic Oscillation, which presents negative values and trends. According to data released by Meteored, this condition is capable of driving the advance of cold fronts over Brazil.<\/p>\n
Another key factor is the intensification of El Ni\u00f1o. This phenomenon is associated with increased rainfall over the central-southern region of Brazil and also plays an important role in the predicted weather patterns for this period. With the more frequent advance of cold fronts, the possibility of incursions of cold air masses over the country also increases.\n<\/p>\n
According to data released by Meteored, the increased frequency of cold air masses should favor temperatures at or below average in the South-Central region during the coming week. Numerical climate prediction models indicate that this pattern may persist throughout September, with temperatures at or below average across much of the South-Central region. Meanwhile, the North and Northeast regions are expected to continue experiencing higher than normal temperatures.<\/p>\n
The combination of more frequent cold fronts, increased rainfall, and temperatures at or below average represents a change from the previously observed pattern.<\/p>\n
According to data released by Meteored, the first week of September should consolidate this new scenario, with intense rainfall mainly affecting the South, Southeast, and Midwest regions. However, the forecast is subject to updates as new data from the numerical models are incorporated into subsequent runs.<\/p>\n<\/p><\/div>\n