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What does Bft mean?| Bft | Surroundings | Wind | Knots | kph | mph |
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| 0 | Smoke rises vertically and the sea is mirror smooth. | calm | 0 | 0 | 0 | | 1 | Smoke moves slightly with breeze and shows direction of wind. | light air | 1-3 | 1-5 | 1-3 | | 2 | You can feel wind on your face and hear the leaves start to rustle. | light breeze | 4-6 | 6-11 | 4-7 | | 3 | Smoke will move horizontally and small branches start to sway. Wind extends a light flag. | gentle breeze | 7-10 | 12-19 | 8-12 | | 4 | Loose dust or sand on the ground will move. Larger branches will sway. Loose paper blows around. | moderate breeze | 11-16 | 20-28 | 13-18 | | 5 | Surface waves form on water and small trees sway. | fresh breeze | 17-21 | 29-38 | 19-24 | | 6 | Trees begin to bend with the force of the wind. Telephone wires will make whistling noises. | strong breeze | 22-27 | 39-49 | 25-31 | | 7 | Large trees sway. | moderate gale | 28-33 | 50-61 | 32-38 | | 8 | Twigs break from trees. Long streaks of foam appear on the ocean. | fresh gale | 34-40 | 62-74 | 39-46 | | 9 | Branches break from trees. | strong gale | 41-47 | 75-88 | 47-55 | | 10 | Trees are uprooted. The sea takes on a white appearance. | whole gale | 48-55 | 89-102 | 56-64 | | 11 | Widespread damage. | storm | 56-63 | 103-117 | 65-73 | | 12 | Structural damage on land. Storm waves at sea. | hurricane | 64+ | 118+ | 74+ |
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