Rescue efforts continued Tuesday to uncover survivors from the tornado that came through Moore, Oklahoma.
It has been preliminarily declared a category F4, that is Fujita Scale 4.
The system of rating tornadoes was developed by Ted Fujita, a scientist from Japan.
Anchor Marco Werman speaks with Harold Brooks, research meteorologist for the National Severe Storms Laboratories in Norman, Oklahoma about Ted Fujita and the aftermath of the tornado in Moore.
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