Wind force
Wind force measured in Bft, km/h, and m/s
Beaufort scale (Wind force)
In de weather forecast reports, the RMI uses the Beaufort scale to define the wind intensity taking the average wind speed, calculated over a period of 10 minutes and on a height of 10 m above the observation station.
|
Used term |
Beaufort scale |
Speed in km/h |
Speed in m/s |
Speed in knots |
|
Windstill |
0 |
Less than 1 |
0 to 0,2 |
Less than 1 |
|
Weak wind |
1-2 |
1 to 11 |
0,3 to 3,3 |
1 to 6 |
|
Average wind |
3-4 |
12 to 28 |
3,4 to 7,9 |
7 to 16 |
|
Moderate Strong wind |
5 |
29 to 38 |
8 to 10,7 |
17 to 21 |
|
Forceful wind |
6 |
39 to 49 |
10,8 to 13,8 |
22 to 27 |
|
Strong wind |
7 |
50 to 61 |
13,9 to 17,1 |
28 to 33 |
|
Stormy wind |
8 |
62 to 74 |
17,2 to 20,7 |
34 to 40 |
|
Storm |
9 |
75 to 88 |
20,8 to 24,4 |
41 to 47 |
|
Heavy storm |
10 |
89 to 102 |
24,5 to 28,4 |
48 to 55 |
|
Very heavy storm |
11 |
103 to 117 |
28,5 to 32,6 |
56 to 63 |
|
Hurricane |
12 |
More than 117 |
More than 32,6 |
More than 63 |