A scale of tornado intensity, developed by the Tornado and Storm Research Organisation (TORRO) in the United Kingdom. Although similar in some respects to the Fujita scale, it is defined on the basis of wind speed, rather than on the intensity of damage. It may thus be considered more appropriate when there are accurate measurements of wind speed by Doppler radar or other methods. (Note that neither scale has been officially adopted by the World Meteorological Organization.)
Note that the scale is defined in terms of wind speeds in m s−1, but that the speeds in km h−1 are rounded conversions, and thus appear discontinuous.
Subjects: Meteorology and Climatology.