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Maria A. F. Silva Dias

change, classify it as “bad” ( O Estado de São Paulo , 6 December 2009, p. A29). Tornadoes are the most violent feature associated with severe storms, though they have a short lifetime (usually from a few minutes to 20 min), a short pathlength (usually less than 20 km), and small dimensions (a few hundred meters in diameter). Though they were practically unknown to most Brazilians just a few decades ago, tornadoes have been mentioned in the news more and more in recent years, and even more educated

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