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Thursday, May 14 at 8PM ET/PT

National Geographic Explorer-in- Residence Tim Samaras heads to America’s heartland during peak twister season to measure the massive force of a supercell storm, one of nature’s most destructive events. These storms can spawn powerful tornados that can unleash winds up to 300 mph and massive hail the size of softballs.  Samaras’ risky two-part mission is to first deploy scientific devices inside and outside a storm in hopes of gathering a 3-D snapshot of information that could improve tornado warnings, and then measure the impact of hail strikes to help passenger jet manufacturer Boeing improve aircraft safety. Braving unpredictable tornados, flooded gravel roads, downed power lines, lightening strikes and flying debris, Samaras’ team takes its chances on the next big superstorm looming overhead to get the data they need.