Clothesline Cover Wind Chart

Wind Ratings Chart

The chart below will give you all the information you need.

Beaufort scale numberDescriptive termUnits in km/hUnits in knotsDescription on LandDescription at Sea
0Calm00Smoke rises verticallySea like a mirror.
1-3Light winds19 km/h or less10 knots or lessWind felt on face; leaves rustle; ordinary vanes moved by wind.Small wavelets, ripples formed but do not break: A glassy appearance maintained. 
4Moderate winds20 – 29 km/h11-16 knotsRaises dust and loose paper; small branches are moved.Small waves – becoming longer; fairly frequent white horses.
5Fresh winds30 – 39 km/h17-21 knotsSmall trees in leaf begin to sway; crested wavelets form on inland watersModerate waves, taking a more pronounced long form; many white horses are formed – a chance of some spray
6Strong winds40 – 50 km/h22-27 knotsLarge branches in motion; whistling heard in telephone wires; umbrellas used with difficulty. Large waves begin to form; the white foam crests are more extensive with probably some spray
7Near gale51 – 62 km/h28-33 knotsWhole trees in motion; inconvenience felt when walking against wind.Sea heaps up and white foam from breaking waves begins to be blown in streaks along direction of wind.
8Gale63 – 75 km/h34-40 knotsTwigs break off trees; progress generally impeded.Moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks along the direction of the wind.
9Strong gale76 – 87 km/h41-47 knotsSlight structural damage occurs -roofing dislodged; larger branches break off.High waves; dense streaks of foam; crests of waves begin to topple, tumble and roll over; spray may affect visibility.
10Storm88 – 102 km/h48-55 knotsSeldom experienced inland; trees uprooted; considerable structural damage.Very high waves with long overhanging crests; the resulting foam in great patches is blown in dense white streaks; the surface of the sea takes on a white appearance; the tumbling of the sea becomes heavy with visibility affected. 
11Violent storm103 -117 km/h56-63 knotsVery rarely experienced – widespread damageExceptionally high waves; small and medium sized ships occasionally lost from view behind waves; the sea is completely covered with long white patches of foam; the edges of wave crests are blown into froth.
12+Hurricane118 km/h or more64 knots or moreThe air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected
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