Sea Area Forecast
Forecast valid from: 23:30, Tuesday 18 August 2026 until 00:00, Thursday 20 August 2026
Small Craft Warning
1. Southwest to west winds will reach force 6 at times tonight (Tuesday night) and tomorrow morning on Irish coasts from Roches Point to Slyne Head to Malin Head. 2. West to northwest winds, veering northwest to north, will reach force 6 tomorrow (Wednesday) afternoon and evening on Irish coasts from Carnsore Point to Valentia to Bloody Foreland.
Gale Warning
Nil
Meteorological Situation at 21:00 UTC
A depression of 997hPa, centred approximately 270 nautical miles northwest of Malin Head, generates a moderate to fresh westerly airflow over Ireland. A cold front moves southeast across the country.
Small Craft Warning: In effect
Heavy Swell (>4m) : No
Forecast for Roches Point to Slyne Head to Bloody Foreland
Wind: Southwest to west force 4 to 6. Later veering northwest to north.
Weather: Cloudy or fair with scattered showers, heavy at times with a chance of isolated thunderstorms.
Visibility: Mostly good. Decreasing moderate or poor in showers.
Forecast for Bloody Foreland to Belfast Lough to Howth Head and for the North Irish Sea
Wind: Southwest to west force 4 to 6. Soon decreasing force 3 to 5. Later becoming cyclonic variable force 3 to 5.
Weather: Cloudy with rain or drizzle and patches of mist. Cloudy to fair with scattered showers imminent, turning heavy at times with a chance of isolated thunderstorms.
Visibility: Mostly good. Decreasing moderate or poor in precipitation and mist.
Forecast for Howth Head to Carnsore Point to Roches Point and for the South Irish Sea
Wind: Southwest to west force 4 or 5 imminent. Soon increasing force 4 to 6.
Weather: Cloudy with rain or drizzle and patches of mist. Cloudy to fair with scattered showers imminent, turning heavy at times with a chance of isolated thunderstorms.
Visibility: Mostly good. Decreasing moderate or poor in precipitation and mist.
Outlook for a further 24 hours until 00:00, Friday 21 August 2026
Moderate to strong and gusty northwest to north winds. Cloudy or fair with scattered showers, heavy at times with a chance of isolated thunderstorms.
Forecast issued at: 23:30, Tuesday 18 August 2026
All times are local unless specified
