The Beaufort Scale

 Force

 Knots

 Kilometres / hour

<

 Metres / second

 Description

 Sea State

 0

 0-1

 0-2

 0-0.5
(0.5 E 0)

 Calm
Mirror like.

 1

 1-3

 2-6

 0.5-1.5
(0.15 E 1)

 Light Air
Ripples.

 2

 4-6

 7-11

 1.5-3.0
(0.3 E 1)

 Light Breeze
Small wavelets, not breaking.

 3

 7-10
bsp;7-10

 12-19

 3.0-5.0
(0.5 E 1)

 Gentle Breeze
Large wavelets, the odd white horse.

 4

 11-16

 20-30

 5.0-8.0
(0.2 E 1)

 Moderate Breeze
Small waves, frequent white horses.

 5

 17-21

 31-39

 8.0-11.0
(0.11 E 2)

 Fresh Breeze
Moderate waves, many white hirses, a little spray.

 6

 22-27

 40-50

 11.0-14.0
(0.14 E 2)

 Strong Breeze

 Strong Breeze
 Large waves, whit foam crests. Probably spray.

 7

 28-33

 51-61

 14.0-17.0
(0.17 E 2)

 Near Gale
Sea heaps up, f1">Sea heaps up, foam begins to be bloan in streaks.

 8

 34-40

 62-74

 17.0-20.5
(0.21 E 2)

 Gale
Moderately high waves, longer with edged crests that begin to break in to spindrift.in to spindrift. Foam blown into well-marked streaks.

 9

 41-47

 75-87

 20.5-24.0
(0.24 E 2)

 Severe Gale
High waves, crests begin to topple, tumble and roll over. Spray may aover. Spray may affect visibility.

 10

 48-55

 88-102

 24.0-28.0
(0.28 E 2)

 Storm
Very high waves with long overhanging crests

 11

 56-63

 103-117

 28.0-32.5
(0.33 E 2)

 Violent Storm
Exceptionally high waves, sea completely covered with long white patches of foam. Wave crests blown to froth.
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 12

 64+

 118+

 32.5+

 Hurricane
Air filled with foam and spray, sea completely white with driving spray.
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