Using the data released by the Springfield office (as linked above). I wrote up a blog post for ustornadoes.com about the 2-year anniversary. Includes some radar images, and a few maps.
http://www.ustornadoes.com/2013/05/22/joplin-missouri-ef5-tornado-may-22-2011/
Thank you to JoMo, who took the time to compile a list of videos taken along the path of the tornado. I used some of them in one of the maps.
Thinking of Joplin today.