The Beaufort Scale
| Beaufort Degree |
Description |
Wind Speed (mph) |
Average Wave Height at Sea (feet) |
Notes |
| 0 |
Calm |
|
0 |
|
| 1 |
Light Air |
1-3 |
0 |
|
| 2 |
Light Breeze |
4-7 |
0-1 |
|
| 3 |
Gentle Breeze |
8-12 |
1-2 |
Breaking crests |
| 4 |
Moderate Breeze |
13-18 |
2-4 |
Some foam |
| 5 |
Fresh Breeze |
19-24 |
4-8 |
|
| 6 |
Strong Breeze |
25-31 |
8-13 |
Some spray |
| 7 |
Moderate Gale |
32-38 |
13-20 |
Some spindrift |
| 8 |
Fresh Gale |
39-46 |
13-20 |
|
| 9 |
Strong Gale |
47-54 |
13-20 |
Sea begins to roll |
| 10 |
Whole Gale |
55-63 |
20-30 |
Visibility affected |
| 11 |
Storm |
64-72 |
30-45 |
|
| 12 |
Hurricane |
73-82 |
45 |
|
| 13 |
Hurricane |
83-92 |
|
|
| 14 |
Hurricane |
93-103 |
|
|
| 15 |
Hurricane |
104-114 |
|
|
| 16 |
Hurricane |
115-125 |
|
|
| 17 |
Hurricane |
126+ |
|
|