Sea Area Forecast
Forecast valid from: 00:00, Monday 15 December 2025 until 00:00, Tuesday 16 December 2025
Small Craft Warning
Southwesterly winds will occasionally reach force 6 on Irish coasts from Slyne Head to Rossan Point to Malin Head through the period.
Gale Warning
Nil
Atlantic Swell
On southwestern, western and northwestern coasts.
Meteorological Situation at 21:00 UTC
A cold front associated with a depression of 970hPa centred south of Iceland lies over the southeast of Ireland, with a strong to gale force southwesterly airflow ahead of it and a moderate to fresh westerly airflow following it.
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Irish coastal waters from Mizen Head to Erris Head to Belfast Lough
Wind: West to southwest force 4 to 6, strongest in the northwest, imminent.
Weather: Fair with scattered showers. Some mist and fog patches too.
Visibility: Mostly good, decreasing moderate or poor in any mist and fog.
Forecast for Irish coastal waters from Belfast Lough to Carnsore Point to Mizen Head and for the Irish Sea
Wind: Northwesterly or variable force 2 to 4 imminent. Soon decreasing force 2 or 3. Later increasing force 3 or 4.
Weather: Rain clearing southeastwards imminent, becoming fair with isolated showers. Some mist and fog patches too.
Visibility: Mostly good, decreasing moderate or poor in any precipitation or mist and fog.
Outlook for a further 24 hours until 00:00, Wednesday 17 December 2025
Light to moderate west to northwest winds on eastern and southern coasts will back southwesterly and increase fresh to strong on Tuesday night. Moderate to fresh west to southwest winds on western and northern coasts will back southerly and increase strong to gale force on Tuesday night. Weather: Fair with scattered showers in western and northwestern areas. Cloud will build from the west on Tuesday evening, followed by outbreaks of rain and drizzle.
Forecast issued at: 00:00, Monday 15 December 2025
All times are local unless specified
