| De Schaal van Beaufort | ||||
| term | Bft | kn | m/s | km/h |
| windstil | 0 | 0-1 | 0.0-0.2 | 0-2 |
| zwak | 1 | 1-3 | 0.3-1.5 | 2-6 |
| zwak | 2 | 4-6 | 1.6-3.3 | 7-11 |
| matig | 3 | 7-10 | 3.4-5.4 | 12-19 |
| matig | 4 | 11-16 | 5.5-7.9 | 19-30 |
| vrij krachtig | 5 | 17-21 | 8.0-10.7 | 32-40 |
| krachtig | 6 | 22-27 | 10.8-13.8 | 41-51 |
| hard | 7 | 28-33 | 13.9-17.1 | 52-63 |
| stormachtig | 8 | 34-40 | 17.2-20.7 | 65-77 |
| storm | 9 | 41-47 | 20.8-24.4 | 79-91 |
| zware storm | 10 | 48-55 | 24.5-28.4 | 94-106 |
| zeer zware storm | 11 | 56-63 | 28.5-32.6 | 107-120 |
| orkaan | 12 | >63 | >32.6 | >124 |