THE BEAUFORT SCALE

Force No.

Description

Wind Speed

MPH

Knots

0

Calm

0 - 1

0 - 1

1

Light Air

1 - 3

1 - 3

2

Light Breeze

4 - 7

4 - 6

3

Gentle Breeze

8 - 12

7 - 10

4

Moderate Breeze

13 - 18

11 - 16

5

Fresh Breeze

19 - 24

17 - 21

6

Strong Breeze

25 - 31

22 - 27

7

Near Gale

32 - 38

28 - 33

8

Gale

39 - 46

34 - 40

9

Strong Gale

47 - 54

41 - 47

10

Storm

55 - 63

48 - 55

11

Violent Storm

64 - 75

56 - 65

12

Hurricane

76 - 82

66 - 71