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bron: www.kmi.be | | WIND +12U 
WIND +24U 
WIND +36U 
| | Bft | Omschrijving | m/s | Knopen | km/u | m/h |  | | 0 | Windstil | <0.2 | < 1 | < 1 | < 1 | | 1 | Zwakke wind | 0.3 - 1.5 | 1 - 3 | 1 - 5 | 1 - 3 | | 2 | Zwakke wind | 1.6 - 3.3 | 4 - 6 | 6 - 11 | 4 - 7 | | 3 | Matige wind | 3.4 - 5.4 | 7 - 10 | 12 - 19 | 8 - 12 | | | 4 | Matige wind | 5.5 - 7.9 | 11 - 16 | 20 - 28 | 13 - 18 | | 5 | Vrij krachtige wind | 8.0 - 10.7 | 17 - 21 | 29 - 38 | 19 - 24 | | 6 | Krachtige wind | 10.8 - 13.8 | 22 - 27 | 39 - 49 | 25 - 31 | | | 7 | Harde wind | 13.9 - 17.1 | 28 - 33 | 50 - 61 | 32 - 38 | | 8 | Stormachtige wind | 17.2 - 20.7 | 34 - 40 | 62 - 74 | 39 - 46 | | 9 | Storm | 20.8 - 24.4 | 41 - 47 | 75 - 88 | 47 - 54 | | | 10 | Zware storm | 24.5 - 28.4 | 48 - 55 | 89 - 102 | 55 - 63 | | 11 | Zeer zware storm | 28.5 - 32.6 | 56 - 63 | 102 - 117 | 64 - 74 | | 12 | Orkaan | >32.6 | >63 | >117 | >74
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