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Storm Chaser Killed in Okla. Tornadoes

"Nightline" went out with storm chaser Tim Samaras in 2012 as he studied the mystery of how lightning forms
08/10/2012

Transcript for Storm Chaser Killed in Okla. Tornadoes

But we turn now to the summer of wild weather. The hottest july on record, crippling drought in half of the country and now tropical storms bringing epic rains to the east coast. Ji ginger zee has... See More
This transcript has been automatically generated and may not be 100% accurate.
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