After a busy start, tornado events in the U.S. in 2012 have dropped well below the expected norm. The preliminary total of 886 tornadoes through 30 November 2012 is nearly 400 tornadoes below what might be expected in a “normal” year.
NOAA = the US federal National Oceanic and Atmospheric Administration
When I was out there in 2001, and delivering a training course in an office block somewhere (can't remember which city now) I was stranded by cyclone fuelled flooding in Texas and then, near Chicago I think it was, struck by the fact that there was a tornado procedure for the building - all go into the middle of the building, away from the windows. (the opposite of a fire evacuation!) Struck me then that while in the UK we have weather they have climate.
one years results can never make a trend! Bill Bryson in his book about growing up in the 50s in the mid west is pretty entertaining on the subject of the folks sitting on their porches, watching the tornadoes go past in the distance and telling themselves they will be fine.