Sea Crossings
State of Sea until 1800 Thursday 11 December 2025
Dublin - Holyhead
Very rough to high decreasing very rough to rough tonight. Decreasing moderate to rough Wednesday afternoon. Increasing mostly rough again early on Thursday.
Rosslare - South Wales
Very rough to high. Decreasing very rough tonight and further decreasing rough on Wednesday afternoon. Increasing rough to very rough again on Thursday.
Cork - South Wales
Very rough to high. Decreasing very rough tonight and further decreasing rough on Wednesday afternoon. Increasing rough to very rough again on Thursday.
Rosslare - France
High. Decreasing very rough tonight. Further decreasing rough to very rough Wednesday afternoon.
Cork - France
High. Decreasing very rough tonight. Further decreasing rough to very rough Wednesday afternoon.
Rosslare - Spain
Very rough to High. Decreasing very rough tonight. Further decreasing rough to very rough Wednesday afternoon.
Legend
| Sea Crossings | WMO Code | Wave height | Characteristics |
|---|---|---|---|
| 0 | 0 metres (0 ft) | Calm (glassy) | |
| 1 | 0 to 0.1 metres (0.00 to 0.33 ft) | Calm (rippled) | |
| 2 | 0.1 to 0.5 metres (3.9 in to 1 ft 7.7 in) | Smooth (wavelets) | |
| 3 | 0.5 to 1.25 metres (1 ft 8 in to 4 ft 1 in) | Slight | |
| 4 | 1.25 to 2.5 metres (4 ft 1 in to 8 ft 2 in) | Moderate | |
| 5 | 2.5 to 4 metres (8 ft 2 in to 13 ft 1 in) | Rough | |
| 6 | 4 to 6 metres (13 to 20 ft) | Very rough | |
| 7 | 6 to 9 metres (20 to 30 ft) | High | |
| 8 | 9 to 14 metres (30 to 46 ft) | Very high | |
| 9 | Over 14 metres (46 ft) | Phenomenal |
