11. How do I know the Wind Ratings?
The chart below will give you all the information you need.
|Beaufort scale number||Descriptive term||Units in km/h||Units in knots||Description on Land||Description at Sea|
|0||Calm||0||0||Smoke rises vertically||Sea like a mirror.|
|1-3||Light winds||19 km/h or less||10 knots or less||Wind felt on face; leaves rustle; ordinary vanes moved by wind.||Small wavelets, ripples formed but do not break: A glassy appearance maintained.|
|4||Moderate winds||20 - 29 km/h||11-16 knots||Raises dust and loose paper; small branches are moved.||Small waves - becoming longer; fairly frequent white horses.|
|5||Fresh winds||30 - 39 km/h||17-21 knots||Small trees in leaf begin to sway; crested wavelets form on inland waters||Moderate waves, taking a more pronounced long form; many white horses are formed - a chance of some spray|
|6||Strong winds||40 - 50 km/h||22-27 knots||Large 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|
|7||Near gale||51 - 62 km/h||28-33 knots||Whole 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.|
|8||Gale||63 - 75 km/h||34-40 knots||Twigs 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.|
|9||Strong gale||76 - 87 km/h||41-47 knots||Slight 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.|
|10||Storm||88 - 102 km/h||48-55 knots||Seldom 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.|
|11||Violent storm||103 -117 km/h||56-63 knots||Very rarely experienced - widespread damage||Exceptionally 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+||Hurricane||118 km/h or more||64 knots or more||The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected|