Victor Mayta, University of São Paulo, Department of Atmospheric Sciences, Sao Paulo, Brazil, George N Kiladis, NOAA Boulder, Boulder, CO, United States, Juliana Dias, PSD ESRL/NOAA, Boulder, CO, United States, Pedro Leite da Silva Dias, University of Sao Paulo, Atmospheric Science, Sao Paulo, Brazil and Tercio Ambrizzi, USP University of Sao Paulo, São Paulo, Brazil