Okay, it's bugging me a little bit that CNN keeps referring to this tornado as the "second-deadliest" or "tied for deadliest on record", as in this article:
http://www.cnn.com/2011/US/05/23/missouri.tornado/index.html
Yeah, I know that they're going by the "as of 1950" benchmark since that's as far as the official NWS database goes, but come, guys. No one really doubts that the deaths on 3/18/1925, 4/5/1936, 4/9/1947, etc etc. were caused by tornadoes. The overall tornado record might be very spotty prior to 1950, but there's nothing wrong with acknowledging high-death-toll events prior to that.
It does look as if other news outlets (Weather Channel, MSNBC, etc.) are mentioning some of the major tornadoes prior to 1950. Heck even the BBC had a little sidebar on their website that listed some significant past tornado events, including the 1932 Deep South outbreak and the Natchez tornado of 1840.