DOUGLAS SCALE
State of the sea |
Description |
Waves average height (m) |
0 |
calm (glassy) |
0 |
1 |
calm (rippled) |
0-0.1 |
2 |
smooth |
0.1-0.5 |
3 |
slight |
0.5-1.25 |
4 |
moderate |
1.25-2.5 |
5 |
rough |
2.5-4 |
6 |
very rough |
4-6 |
7 |
high |
6-9 |
8 |
very high |
9-14 |
9 |
phenomenal |
>14 |
BEAUFORT SCALE
|
|
Wind speed |
Waves height |
|
|
km/h |
m/s |
kt |
mph |
m |
ft |
0 Bf |
calm |
< 1 |
0-0.2 |
< 1 |
< 1 |
- |
- |
1 Bf |
light air |
1-5 |
0.3-1.5 |
1-3 |
1-3 |
0.1(0.1) |
0.25(0.25) |
2 Bf |
light breeze |
6-11 |
1.6-3.3 |
4-6 |
4-7 |
0.2(0.3) |
0.5(1) |
3 Bf |
gentle breeze |
12-19 |
3.4-5.4 |
7-10 |
8-12 |
0.6(1) |
2(3) |
4 Bf |
moderate breeze |
20-28 |
5.5-7.9 |
11-16 |
13-18 |
1(1.5) |
3.5(5) |
5 Bf |
fresh breeze |
29-38 |
8.0-10.7 |
17-21 |
19-24 |
2(2.5) |
6(8.5) |
6 Bf |
strong breeze |
39-49 |
10.8-13.8 |
22-27 |
25-31 |
3(4) |
9.5(13) |
7 Bf |
near gale |
50-61 |
13.9-17.1 |
28-33 |
32-38 |
4(5.5) |
13.5(19) |
8 Bf |
gale |
62-74 |
17.2-20.7 |
34-40 |
39-46 |
5.5(7.5) |
18(25) |
9 Bf |
strong gale |
75-88 |
20.8-24.4 |
41-47 |
47-54 |
7(10) |
23(32) |
10 Bf |
storm |
89-102 |
24.5-28.4 |
48-55 |
55-63 |
9(12.5) |
29(41) |
11 Bf |
violent storm |
103-117 |
28.5-32.6 |
56-63 |
64-72 |
11.5(16) |
37(52) |
12 Bf |
hurricane |
>=118 |
>=32.7 |
>=64 |
>=73 |
14(-) |
45(-) |
Map of partition of Adriatic