Rehbein, AmandaMosso Dutra, Livia MarciaAmbrizzi, TercioRocha, Rosmeri Porfirio daReboita, Michelle SimoesMendes da Silva, Gyrlene AparecidaGozzo, Luiz Felippe [UNESP]Nobile Tomaziello, Ana CarolinaPereira Silveira Campos, Jose LeandroChavez Mayta, Victor RaulCrespo, Natalia MachadoBueno, Paola GimenesAliaga Nestares, Vannia JaquelineMachado, Lais TabosaDe Jesus, Eduardo MarcosPampuch, Luana Albertani [UNESP]Custodio, Maria de Souza [UNESP]Carpenedo, Camila Bertoletti2018-11-262018-11-262018-01-01Advances In Meteorology. London: Hindawi Ltd, 15 p., 2018.1687-9309http://hdl.handle.net/11449/164350Southeastern Brazil is the most populated and economically developed region of this country. Its climate consists of two distinct seasons: the dry season, extending from April to September, the precipitation is significantly reduced in comparison to that of the wet season, which extends from October to March. However, during nine days of the 2016 dry season, successive convective systems were associated with atypical precipitation events, tornadoes and at least one microburst over the southern part of this region. These events led to flooding, damages to buildings, shortages of electricity and water in several places, many injuries, and two documented deaths. The present study investigates the synoptic and dynamical features related to these anomalous events. The convective systems were embedded in an unstable environment with intense low-level jet flow and strong wind shear and were supported by a sequence of extratropical cyclones occurring over the Southwest Atlantic Ocean. These features were intensified by the Madden-Julian oscillation (MJO) in its phase 8 and by intense negative values of the Pacific South America (PSA) 2 mode.15engArtigo10.1155/2018/4878503WOS:000436287700001Acesso abertoWOS000436287700001.pdf236048787738157095678665160836080000-0001-5680-4479