Beautiful tornado map

A beautiful map from IDV Solutions of the last fifty-six years of U.S. tornado tracks. From the introductory blog post:

Got this data from NOAA via the spectacular Data.gov. It tracks 56 years of tornado paths along with a host of attribute information. Here, the tracks are categorized by their F-Scale (which isn't the latest and greatest means but good enough for a hack like me), where brighter strokes represent more violent storms. Here it is broken out by scale.

You can see the interactive version on visual.ly.

(Via Nicholas Felton)