The new scale was based off of damage just like the old one, the Greensburg tornado was an EF5 thanks to the school and the water tower. The rest of the path of the tornado was an EF3 for the most part, all it takes is one building to be rated EF5 and the tornado goes down as an EF5 in the books.
Nothing was wrong with the scale? In a sense, yes, but in the way that research showed that the estimated wind speeds were wrong based on the damage. So they revamped it to include an easier way to do surveys, more uniform results across the country and the included the new estimated wind speeds based on the same damage that was in the old F scale.
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Jayson Prentice -- Iowa State University Meteorology '09 -- KC0TQO
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