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Sea Crossings

State of Sea until 0000 Thursday 20 September 2018

Dublin - Holyhead

Moderate to rough, increasing rough to very rough Wednesday morning. Decreasing moderate to rough by Wednesday evening and becoming moderate on Wednesday night. Decreasing slight on Thursday morning. Increasing moderate again on Thursday night.

Rosslare - South Wales

Rough, increasing very rough Wednesday morning. Decreasing rough by Wednesday evening and becoming moderate early on Thursday. Increasing rough again during Thursday afternoon.

Cork - South Wales

Rough, increasing very rough Wednesday morning. Decreasing rough by Wednesday evening and becoming moderate early on Thursday. Increasing rough again during Thursday afternoon.

Rosslare - France

Mostly rough, but very rough in the north between now and Wednesday evening. Increasing very rough at times on Thursday evening also.

Cork - France

Mostly rough, but very rough in the north between now and Wednesday evening. Increasing very rough at times on Thursday evening also.

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

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