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| SCALE of FORCE of a WIND (Scale Boforta) |
| Force of a wind in numbers |
Speed in meters per one second |
The name of a wind |
Seen attributes |
| 0 |
0,0-0,5 |
Calm |
The flags on a vessel (branch of trees on a coast) are motionless |
| 1 |
0,6-1,7 |
Silent wind |
| 2 |
1,8-3,3 |
Easy wind |
The flags slightly change |
| 3 |
3,4-5,2 |
Weak wind |
The flags rinse |
| 4 |
5,3-7,4 |
Moderate wind |
The small flags are extended on direct of a wind |
| 5 |
7,5-9,8 |
Fresh wind |
The large flags are extended |
| 6 |
9,9-12,4 |
Strong wind |
In tackles occurs and more and more singing amplifies |
| 7 |
12,5-15,2 |
Strong wind |
| 8 |
15,3-18,2 |
Very strong wind |
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| 9 |
18,3-21,5 |
Storm |
The man hardly moves on a deck |
| 10 |
21,6-25,1 |
Whole gale |
| 11 |
25,2-29,0 |
Hard storm |
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| 12 |
More 29,0 |
Hurricane |
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