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"Big whirls have little whirls that feed on their velocity, and little whirls have lesser whirls and so on to viscosity." - meteorologist Lewis Fry Richardson, 1922

This photogenic tornado touched down in South Dakota on June 22, 2012 near the Oglala National Grasslands. It was on the ground for over 30 minutes and carved a path eight miles long and up to a half-mile wide.

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