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Apos analise de 51 anos de dados de precipitacao (1961-2011) foi observado que em abril de 1984 houve um elevado volume pluviometrico, sobre uma area propicia a ocorrencia de desastres naturais no Nordeste do Brasil, Salvador, capital do estado da Bahia. O acumulado de 889,8 mm caracterizou este evento climatico como extremo e causou diversos impactos a cidade. Com o objetivo de estudar peculiaridades meteorologicas que caracterizaram este caso, o presente trabalho faz uma analise das condicoes atmosfericas associadas. Os resultados mostraram que nos tres meses que antecederam abril de 1984, as anomalias de TSM foram superiores a 0,5°C na area tropical do oceano Atlântico Sul, uma condicao que favorece a evaporacao e, consequentemente, o aumento do teor de umidade da atmosfera. No mes de abril, a area de difluencia na periferia leste da Alta da Bolivia, posicionada ao norte de 15°S, na area central da America do Sul, influenciou o Nordeste do Brasil. Paralelamente, ventos alisios de sudeste anomalamente fortes atuaram na Bahia e area oceânica proxima, uma condicao que favorece o aumento do transporte de calor e umidade para o continente. Esse conjunto de fatores indica a presenca de condicoes favoraveis ao levantamento na coluna de ar abaixo de 200 hPa e o desenvolvimento de conveccao profunda na area de Salvador. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri",sans-serif; mso-ansi-language:PT-BR; mso-fareast-language:PT-BR;} A B S T R A C T After the analysis 51 years of rainfall data (1961-2011) was noted that in April 1984 there was a high volume of rainfall, over an favorable area to occurrence of natural disasters in the Northeast, Salvador, capital city of Bahia State. The accumulated 889.8 mm, characterizing this climate event as extreme and causing many impacts to the city. Thus, this paper analyzes the atmospheric conditions associated with this case. The results showed that in the three months before April 1984, SST anomalies were greater than 0.5°C in the tropical area of the South Atlantic Ocean, a condition which favors the evaporation and the increase of atmospheric moisture content. In April, area of diffluence on the eastern periphery of the Bolivian high, located north of 15°S, in the central area of South America, influenced the Northeast of Brazil. In parallel, southeast winds anomalously strong influenced in Bahia and nearby ocean, a condition that favors the increase of heat and moisture transport to the continent. These factors indicate the presence of favorable conditions to uplift the air column below 200 hPa and development of deep convection in Salvador . Keywords: extreme evento of rainfall , urban area, Northeastern Brazil.

Dynamical mechanisms associated to the occurrence of an extreme climatic event of precipitation in the city of Salvador-BA