Residents in Oklahoma who were commuting home last week when the storm gained strength became vulnerable on the highway. Some may have planned ahead to escape the tornado, but regardless they were stuck on the road and risked becoming the victim of flash flooding.

CNN's Chad Myers says a car is never a safe place to be during a twister. "When a tornado gets done with a car, there's no place left for you in it. The entire thing is smashed to bits," he tells Anderson Cooper.

The Oklahoma Office of the Chief Medical Examiner confirms at least 18 people died on Friday. Three men who lost their lives were storm chasers Tim Samaras, Paul Samaras and Carl Young. Myers emphasizes that Tim was not a daredevil and not carelessly on the road, but a scientist collecting data to better help the government.

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