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Maria A. F. Silva Dias

already a manifestation of climate change. Anyway, recent work by Carvalho et al. (2010) , among others, points to the early 1970s as a time when an abrupt change in rainfall patterns was observed in the south region, resulting in an enhancement of the moisture flux and a significant change in the flow of the Paraná River. The climatology of intense convective systems, such as those by Zipser et al. (2006) and Durkee and Mote (2010) , do not cover a large enough time span to confirm the possible

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Richard W. Dixon and Todd W. Moore

). Edge effects such as this are located where tornado reports may be underreported or large differences in socioeconomic variables among adjacent counties exist. Other considerations with the methods presented in this study are that they represent a snapshot of socioeconomic conditions, which are in constant flux, and the tornado incidence scores are subject to change with each new season. Therefore, tornado vulnerability analyses such as these are best suited to automated systems that can provide

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