Code | Term | Height of waves, feet |
---|---|---|
0 | calm | |
1 | smooth | <1 |
2 | slight | 1-3 |
3 | moderate | 3-5 |
4 | rough | 5-8 |
5 | very rough | 8-12 |
6 | high | 12-20 |
7 | very high | 20-40 |
8 | mountainous | 40+ |
9 | confused |
Code | Description | Significant Wave Height meters (feet) |
|
---|---|---|---|
Range | Mean | ||
0 | Calm (glassy) | 0 | 0 |
1 | Calm (rippled) | 0-0.1 (0-1) | 0.05 |
2 | Smooth (mini-waves) | 0.1-0.5 (1-2) | 0.3 |
3 | Slight | 0.5-1.25 (2-4) | 0.875 |
4 | Moderate | 1.25-2.5 (4-8) | 1.875 |
5 | Rough | 2.5-4.0 (8-13) | 3.25 |
6 | Very rough | 4.0-6.0 (13-20) | 5.0 |
7 | High | 6.0-9.0 (20-30) | 7.5 |
8 | Very high | 9.0-14.0 (30-45) | 11.5 |
9 | Phenomenal | >14.0 (45+) | >14.0 |
Wind Speed (knots) |
Sea State |
Significant Wave (feet) |
Significant Range of Periods (sec) |
Average Period (sec) |
Average Length of Waves (feet) |
---|---|---|---|---|---|
3 | 0 | <.5 | <.5 - 1 | 0.5 | 1.5 |
4 | 0 | <.5 | .5 - 1 | 1 | 2 |
5 | 1 | 0.5 | 1 - 2.5 | 1.5 | 9.5 |
7 | 1 | 1 | 1 - 3.5 | 2 | 13 |
8 | 1 | 1 | 1 - 4 | 2 | 16 |
9 | 2 | 1.5 | 1.5 - 4 | 2.5 | 20 |
10 | 2 | 2 | 1.5 - 5 | 3 | 26 |
11 | 2.5 | 2.5 | 1.5 - 5.5 | 3 | 33 |
13 | 2.5 | 3 | 2 - 6 | 3.5 | 39.5 |
14 | 3 | 3.5 | 2 - 6.5 | 3.5 | 46 |
15 | 3 | 4 | 2 - 7 | 4 | 52.5 |
16 | 3.5 | 4.5 | 2.5 - 7 | 4 | 59 |
17 | 3.5 | 5 | 2.5 - 7.5 | 4.5 | 65.5 |
18 | 4 | 6 | 2.5 - 8.5 | 5 | 79 |
19 | 4 | 7 | 3 - 9 | 5 | 92 |
20 | 4 | 7.5 | 3 - 9.5 | 5.5 | 99 |
21 | 5 | 8 | 3 - 10 | 5.5 | 105 |
22 | 5 | 9 | 3.5 - 10.5 | 6 | 118 |
23 | 5 | 10 | 3.5 - 11 | 6 | 131.5 |
25 | 5 | 12 | 4 - 12 | 7 | 157.5 |
27 | 6 | 14 | 4 - 13 | 7.5 | 184 |
29 | 6 | 16 | 4.5 - 13.5 | 8 | 210 |
31 | 6 | 18 | 4.5 - 14.5 | 8.5 | 236.5 |
33 | 6 | 20 | 5 - 15.5 | 9 | 262.5 |
37 | 7 | 25 | 5.5 - 17 | 10 | 328.5 |
40 | 7 | 30 | 6 - 19 | 11 | 394 |
43 | 7 | 35 | 6.5 - 21 | 12 | 460 |
46 | 7 | 40 | 7 - 22 | 12.5 | 525.5 |
49 | 8 | 45 | 7.5 - 23 | 13 | 591 |
52 | 8 | 50 | 7.5 - 24 | 14 | 566 |
54 | 8 | 55 | 8 - 25.5 | 14.5 | 722.5 |
57 | 8 | 60 | 8.5 - 26.5 | 15 | 788 |
61 | 9 | 70 | 9 - 28.5 | 16.5 | 920 |
65 | 9 | 80 | 10 - 30.5 | 17.5 | 1099 |
69 | 9 | 90 | 10.5 - 32.5 | 18.5 | 1182 |
Copyright © 2012 Sizes, Inc. All rights reserved.
Last revised: 25 February 2012.