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intense storms and wind shear has been attempted by certain authors. In the particular case of subtropical South America, a good indication of the increase in wind shear is the increase in speed of the upper-level jet and/or of the lower-level jet, which are dominant features in the MCC cases ( Velasco and Fritsch 1987 ; Vera et al. 2006 ). Carvalho et al. (2005) show that Pacific sea surface temperature has an impact on the upper-level wind speed over the south region, and Barros et al. (2002
intense storms and wind shear has been attempted by certain authors. In the particular case of subtropical South America, a good indication of the increase in wind shear is the increase in speed of the upper-level jet and/or of the lower-level jet, which are dominant features in the MCC cases ( Velasco and Fritsch 1987 ; Vera et al. 2006 ). Carvalho et al. (2005) show that Pacific sea surface temperature has an impact on the upper-level wind speed over the south region, and Barros et al. (2002
