|Perryville, MO tornado Tuesday night illuminated by power flashes.|
Photos by AccuWeather's Reed Timmer.
Almost from the beginning, it has been apparent the EF-Scale was highly flawed and that Ted Fujita's original "Fujita Scale" was better. I wrote a detailed blog post on this subject on August 31, 2013, with several subsequent posts.
The EF-Scale's flaws are two-fold:
- Its wind speeds at too low, especially at the top end.
- The Fujita Scale allows for direct measurement of wind speeds and the EF scale does not. The EF scale is a "damage" scale only.
Here is an illustration of the latter point that the original F-Scale allows for direct measurements.
The Wichita Eagle has an article, published today, written by Stan Finger on the research being done to fix the EF-Scale. Given the information in the article, they are finding that Ted's original numbers (higher wind speeds) were much more accurate than those in the EF Scale. They expect to have a third scale in about 18 months.
Given the information in Stan's article, they might save themselves a lot of work and simply go back to Ted's original scale.