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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