| Beaufort | Knots |
m/s | km/h | Description | Sea conditions | Land conditions |
| 0 | 0 - 1 | 0 - 0,2 | 0 - 1 | Calm | Flat | Calm. Smoke rises vertically. |
| 1 | 1 - 3 | 0,3 - 1,5 | 1 - 5,9 | Light air | Ripples without crests. | Smoke drift indicates wind direction. Leaves and wind vanes are stationary. |
| 2 | 4 - 6 | 1,6 - 3,3 | 6 - 11,9 | Light breeze | Small wavelets. Crests of glassy appearance, not breaking | Wind felt on exposed skin. Leaves rustle. Wind vanes begin to move. |
| 3 | 7 - 10 | 3,4 - 5,4 | 12 - 19,9 | Gentle breeze | Large wavelets. Crests begin to break; scattered whitecaps | Leaves and small twigs constantly moving, light flags extended. |
| 4 | 11 - 15 | 5,5 - 7,9 | 20 - 28,9 | Moderate breeze | Small waves with breaking crests. Fairly frequent whitecaps. | Dust and loose paper raised. Small branches begin to move. |
| 5 | 16 - 21 | 8,0 - 10,7 | 29 - 38,9 | Fresh breeze | Moderate waves of some length. Many whitecaps. Small amounts of spray. | Branches of a moderate size move. Small trees in leaf begin to sway. |
| 6 | 22 - 27 | 10,8 - 13,8 | 39 - 49,9 | Strong breeze | Long waves begin to form. White foam crests are very frequent. Some airborne spray is present. | Large branches in motion. Whistling heard in overhead wires. Umbrella use becomes difficult. Empty plastic bins tip over. |
| 7 | 28 - 33 | 13,9 - 17,1 | 50 - 61,9 | High wind, moderate gale, near gale | Sea heaps up. Some foam from breaking waves is blown into streaks along wind direction. Moderate amounts of airborne spray. | Whole trees in motion. Effort needed to walk against the wind. |
| 8 | 34 - 40 | 17,2 - 20,7 | 62 - 74,9 | Gale, fresh gale | Moderately high waves with breaking crests forming spindrift. Well-marked streaks of foam are blown along wind direction. Considerable airborne spray. | Some twigs broken from trees. Cars veer on road. Progress on foot is seriously impeded. |
| 9 | 41 - 47 | 20,8 - 24,4 | 75 - 88,9 | Strong gale | High waves whose crests sometimes roll over. Dense foam is blown along wind direction. Large amounts of airborne spray may begin to reduce visibility. | Some branches break off trees, and some small trees blow over. Construction/temporary signs and barricades blow over. |
| 10 | 48 - 55 | 24,5 - 28,4 | 89 - 102 | Storm, whole gale | Very high waves with overhanging crests. Large patches of foam from wave crests give the sea a white appearance. Considerable tumbling of waves with heavy impact. Large amounts of airborne spray reduce visibility. | Trees are broken off or uprooted, structural damage likely. |
| 11 | 56 - 63 | 28,5 - 32,6 | 103 - 117 | Violent storm | Exceptionally high waves. Very large patches of foam, driven before the wind, cover much of the sea surface. Very large amounts of airborne spray severely reduce visibility. | Widespread vegetation and structural damage likely. |
| 12 | 64 - 71 | 32,7 - 36,9 | 118 - 133 | Hurricane force | Huge waves. Sea is completely white with foam and spray. Air is filled with driving spray, greatly reducing visibility. | Severe widespread damage to vegetation and structures. Debris and unsecured objects are hurled about. |
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