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TORRO scale


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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.)

scale number

wind speed

name

m s−1

km h−1

T0

17–24

61–86

light

T1

25–32

90–115

mild

T2

33–41

119–148

moderate

T3

42–51

151–184

strong

T4

52–61

187–220

severe

T5

62–72

223–259

intense

T6

73–83

263–299

moderately devastating

T7

84–95

302–342

strongly devastating

T8

96–107

346–385

severely devastating

T9

108–120

389–432

intensely devastating

T10

>121

>436

super

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.


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