Tornado map

Here is an interesting map.  It shows the tornado activity in the U.S. over the past 56 years.

Here is a link to what appears to be the original web site: http://uxblog.idvsolutions.com/2012/05/tornado-tracks.html

Here is a link to the map where you can click and zoom in on the map.

http://farm8.staticflickr.com/7090/7157010997_2a92fa603c_o.jpg