| Calm (glassy) |
calm (glassy) |
0 metres (0 ft) |
WMO |
| Calm (rippled) |
calm (rippled) |
Waves from 0 to 0.1 metres (0.00 to 0.33 ft) |
WMO |
| Smooth (wavelets) |
smooth (wavelets) |
Waves from 0.1 to 0.5 metres (3.9 in to 1 ft 7.7 in) |
WMO |
| Slight |
slight |
Waves from 0.5 to 1.25 metres (1 ft 8 in to 4 ft 1 in) |
WMO |
| Moderate |
moderate |
Waves from 1.25 to 2.5 metres (4 ft 1 in to 8 ft 2 in) |
WMO |
| Rough |
rough |
Waves from 2.5 to 4 metres (8 ft 2 in to 13 ft 1 in) |
WMO |
| Very rough |
very rough |
Waves from 4 to 6 metres (13 to 20 ft) |
WMO |
| High |
high |
Waves from 6 to 9 metres (20 to 30 ft) |
WMO |
| Very high |
very high |
Waves from 9 to 14 metres (30 to 46 ft) |
WMO |
| Phenomenal |
phenomenal |
Waves over 14 metres (46 ft) |
WMO |