Lisa Price speaks with David Horn, vice president of operations and strategic partnerships for Invest Greenville, and R.V. Hight, former journalist with the Sanford Herald, about their personal experiences during the April 16, 2011 tornado outbreak, the deadliest in North Carolina since 1984. National Weather Service meteorologist Nick Petro also explains the atmospheric conditions that produced the supercell tornadoes and how warning systems have improved in the 15 years since.