CNN Erin Burnett OutFront May 20, 2013 23:11:00
History, the pictures seem to indicate this is close to unprecedented. do the facts support that? >> absolutely. something else that is unique about this storm, erin, eight miles west of where it touched down, there was nothing. there was a thunderstorm. then five minutes later, there was a funnel. five minutes after that, we were ef-2. then five minutes after that, we were ef-4. this developed so quickly. the warning system worked. but the first moore tornado in 1999, people had an hours notice...
Source: archive.org