Wind speed at 10 meters, snapshot every 3 hours 1 bft (1 - 5 km / h), light train 2 bft (6-11 km / h), light breeze 3 bft (12-19 km / h), gentle breeze 4 Bft (20 - 28 km / h), moderate breeze 5 bft (29 - 38 km / h), fresh breeze 6 bft (39 - 49 km / h), strong winds 7 bft (50 - 61 km / h), stiffer Wind 8 bft (62 - 74 km / h), stormy wind 10 bft (89 - 102 km / h), heavy storm 11 bft (103-117 km / h), galeous storm 12 bft (≥ 117 km / h) hurricane