How do you measure a tornado? [Article]

Kurt Vonnegut's brother, Bernie, posthumously won the 1997 Ig Nobel Prize for meteorology for establishing that the then state-of-the-art method, involving a chicken carcass and a cannon was imperfect. The New Yorker had a recent piece on how tornadoes, or rather their impacts, are measured, using a scale that came into use in 2007, called the E.F scale: