Beaufort scale
Beaufort scale Named after the 19th-century British naval officer who devised it, the Beaufort Scale assesses wind speed according to its effects. Originally designed in 1806 as an aid for sailors, it has since been adapted for use on land and was internationally recognised in 1874.
Scale | Wind speed | Name | |
|---|---|---|---|
km/h | mph | ||
0 | 0–1 | 0–1 | Calm |
1 | 1–5 | 1–3 | Light air |
2 | 6–11 | 4–7 | Light breeze |
3 | 12–19 | 8–12 | Gentle breeze |
4 | 20–28 | 13–18 | Moderate |
5 | 29–38 | 19–24 | Fresh |
6 | 39–49 | 25–31 | Strong |
7 | 50–61 | 32–38 | Near gale |
8 | 62–74 | 39–46 | Gale |
9 | 75–88 | 47–54 | Strong gale |
10 | 89–102 | 55–63 | Storm |
11 | 103–117 | 64–72 | Violent storm |
12–17 | 118+ | 73+ | Hurricane |
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Beaufort scale
