South American Tornado Alley

The Tornado corridor of South America is the region where cold, dry winds from the Andes and Patagonia meet warm, humid winds from the Amazon and the Chaco, creating conditions conducive to the formation of tornadoes.: The area was named by the São Leopoldo Urban Climatology Station Network.

It includes the states of Rio Grande do Sul, Santa Catarina, Paraná, São Paulo, all of south-central Minas Gerais, Mato Grosso do Sul in Brazil, as well as central and northern Argentina, Uruguay, Paraguay, and the south-central portion of Bolivia. This region (especially central Argentina) is considered one of the areas with a high probability of tornado occurrence in the world. It is estimated that up to 50 tornadoes are generated in this area per year, being more common in autumn and spring.

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