Tornado frequency worldwide
|
B. Geerts and E. Linacre |
6/'98 |
Tornadoes have been reported widely (Table 1), especially in the central Great Plains of the USA (Fig 1), where they also can be most violent.
| Country or region | Number of tornadoes per year per 105 km2 | Fraction of strong tornadoes (F2-F5) |
| South Africa |
0.4 |
35% |
| Bangladesh |
0.6 |
? |
| Uruguay |
0.8 |
? |
| United Kingdom |
1.0 |
<10% |
| Sydney, Australia |
8 |
20-30% |
| Tornado alley (Oklahoma-Kansas, USA) |
40 |
42% |
Table 1. Tornado frequency and intensity in select geographical regions (1,2,3,4).
Fig 1. Tornado frequency in the USA. The frequency increases from grey to red (Source: the Weather Channel).