World Meteorological Organization Sea State Code
The WMO sea state code largely adopts the 'wind sea' definition of the Douglas Sea Scale.
| WMO Sea State Code | Wave Height (meters) | Characteristics |
|---|---|---|
| 0 | 0 | Calm (glassy) |
| 1 | 0 to 0.1 | Calm (rippled) |
| 2 | 0.1 to 0.5 | Smooth (wavelets) |
| 3 | 0.5 to 1.25 | Slight |
| 4 | 1.25 to 2.5 | Moderate |
| 5 | 2.5 to 4 | Rough |
| 6 | 4 to 6 | Very rough |
| 7 | 6 to 9 | High |
| 8 | 9 to 14 | Very high |
| 9 | Over 14 | Phenomenal |
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- Direction from which swell is coming should be recorded.
- Confused swell should be recorded as "confused northeast," if coming from the direction of northeast.
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