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O estudo teve como objetivo analisar a forte conveccao provocada por uma Perturbacao Ondulatoria dos Alisios (POA) sobre o estado de Alagoas no dia 27 de maio de 2017. A analise e previsao de sistemas dessa magnitude desperta interesse devido os fenomenos adversos provocados e consequencias a populacao. Foram utilizados dados de reanalise global ERA Interim fornecidos pelo European Centre for Medium-Range Weather Forecasts (ECMWF) com resolucao espacial de 0,75o de latitude x 0,75o de longitude. Estes dados foram utilizados no software OpenGrADS para plotagem dos campos meteorologicos para a analise sinotica. Os dados referentes a precipitacao acumulada foram fornecidos pela Secretaria de Estado do Meio Ambiente e dos Recursos Hidricos (SEMARH) a partir de 25 estacoes meteorologicas espalhadas por Alagoas. A perturbacao se desenvolveu apos a passagem de um sistema frontal que atingiu o Nordeste do Brasil alguns dias antes. O sistema sinotico pode ser observado no campo de pressao a nivel do mar e atraves das linhas de correntes em baixos niveis (925 e 850hPa) entre os dias 26 e 27, onde o eixo do cavado se concentrou sobre o estado de Alagoas. Os campos do fluxo de umidade integrado na vertical indicaram valores bastante elevados provenientes do Atlântico, adentrando Alagoas entre os dias 25 e 27. Atraves da analise da serie de dados climatologica, maio de 2017 registrou o terceiro maior pico de pluviometria (692mm/24h), onde somente no dia 27 foram registrados 173mm/24h, o que correspondeu a cerca de 25% da media historica. Intense Precipitation Event Provoked by the Wave Disturbance of Trade Winds Over the Alagoas State A B S T R A C T The main objective of this study was to analyze the Wave Disturbance of Trade Winds (WDTW) dynamics that provoked strong rainfall over the Alagoas state on May 27 of 2017. The analysis and systems forecasting of this magnitude arouses interest due to the adverse phenomena caused and consequences to the population. Global ERA Interim reanalysis data was provided by the European Center for Medium-Range Weather Forecasts (ECMWF) with spatial resolution of 0.75o latitude x 0.75o longitude. This dataset was used in conjunction with OpenGrADS software to the meteorological fields plot for synoptic analysis. Precipitation dataset were collected from 25 meteorological stations spread across the Alagoas state provided by the State Secretary for the Environment and Water Resources (SEMARH). The disturbance developed after a frontal system passage that reached BNE a few days earlier. The synoptic system could be observed in the pressure at sea level field and through the streamlines at low levels (925 and 850hPa) between 26 and 27 of May, where the Trough axis was concentrated over Alagoas. The strong convection was also driven by a high-level Trough, lasted from 30oS. The vertical integrated moisture flow fields indicated very high values from the Atlantic Ocean, reaching Alagoas between 25th and 27 of May. Through the analysis of climatological data, in May 2017 was registered the third highest peak of rainfall (692 mm/24h), where only on the 27th 173 mm/24h was recorded, which corresponded to the fence 25% of the historical average. Keywords: WDTW; Adverse Phenomena, Alagoas.

Evento de Precipitação Intensa Associado às Perturbações Ondulatórias dos Alísios Sobre o Estado de Alagoas.