The TORRO tornado intensity scale was developed by Terence Meaden at the Tornado and Storm Research Organisation (TORRO) in the United Kingdom. It can be used to describe the intensity of a tornado.
TORRO Scale
Description
Wind Speed in mph
0
light
39 to 54
1
mild
55 to 72
2
moderate
73 to 92
3
strong
93 to 114
4
severe
115 to 136
5
intense
137 to 160
6
moderately devastating
161 to 186
7
strongly devastating
187 to 212
8
severely devastating
213 to 240
9
intensely devastating
241 to 269
10
super
270 to 299
11
>= 300
corresponding Beaufort scale =
= 2 * (T + 4)
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