There have been few tornado setups where I have been legitimately scared — May 31st 2013 was one of them.
Out of all the big urban tornadoes of recent years — I suppose Tuscaloosa, Joplin, and Moore come to mind — only Moore I have been able to track from start to finish. I have a penchant for turning on my computer just when sh*t hits the fan, and this was certainly true for Tuscaloosa and Joplin. Moore was a different type of a tornado from my perspective – a slow-moving, lumbering giant that steadily marched towards civilization. A slow-motion train wreck.