Deadly Tornadoes Remain Hard To Predict

Butch Dill/AP

Residents survey the destruction after a tornado hit Pratt City, Ala., on April 27. Short-term forecasting of twisters like the ones that swept the South this week has grown increasingly accurate, but long-term forecasting remains highly unreliable.

Source: http://www.npr.org/2011/04/30/135849668/deadly-tornadoes-remain-hard-to-predict?ft=1&f=1003

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