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FAQ
The scale of Beaufort
Bft and m/s
Wind speed and wind pressure

The wind pressure can be approximated by: Pressure = ½ x (density of air) x (wind speed)2 x (shape factor)

See this table:
 
Bft
Wind speed (m/s)
Wind pressure (N/m2)
Lower limit
Upper limit
Upper limit
0
0.0
0.2
0.03
1
0.3
1.5
1.4
2
1.6
3.3
6.8
3
3.4
5.4
18
4
5.5
7.9
39
5
8.0
10.7
72
6
10.8
13.8
119
7
13.9
17.1
183
8
17.2
20.7
268
9
20.8
24.4
372
10
24.5
28.4
504
11
28.5
32.5
660
12
32.6
> 660

Since the scale of Beaufort and the wind speed are not related linearly, it is not possible to express the wind pressure as:
Pressure = (constant) x (wind speed in Bft)2.