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Beaufort Wind Force Scale (from Wikipedia)


0 1 2 3 4 5 6 7 8 9 10 11 12
Calm Light Air Light Breeze Gentle Breeze Moderate Breeze Fresh Breeze Strong Breeze Near Gale Gale Strong Gale Storm Violent Storm Hurricane Force
Light Winds Advisory-force Gale-force Storm-force Hurricane-force
mph:
< 1

knots:
< 1

m/s:
< 0.3
mph:
1 - 3

knots:
1 - 3

m/s:
0.3 - 1.5
mph:
4 - 7

knots:
4 - 6

m/s:
1.6 - 3.3
mph:
8 - 12

knots:
7 - 10

m/s:
3.4 - 5.5
mph:
13 - 18

knots:
11 - 16

m/s:
5.5 - 7.9
mph:
18 - 24

knots:
17 - 21

m/s:
8.0 - 10.7
mph:
25 - 31

knots:
22 - 27

m/s:
10.8 - 13.8
mph:
31 - 38

knots:
28 - 33

m/s:
3.9 - 17.1
mph:
39 - 46

knots:
34 - 40

m/s:
17.2 - 20.7
mph:
47 - 54

knots:
41 - 47

m/s:
20.8 - 24.4
mph:
55 - 63

knots:
48 - 55

m/s:
24.5 - 28.4
mph:
64 - 72

knots:
56 - 63

m/s:
28.5 - 32.6
mph:
≥ 73

knots:
≥ 63

m/s:
≥ 32.7

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