Friday's storm, which produced a mile-wide tornado, as it neared El Reno, Okla.
Richard Rowe /Reuters /Landov
June 3, 2013 A scientist who studies tornadoes says there's still much to be learned about how they form and how to better forecast them. Still, the storm chasing and research communities will be reevaluating their procedures in the wake of three colleagues' deaths.
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