Low 971 hPa centered at 230 nautical miles in the West-South-West of Fastnet Rock (South-West Ireland) moving at 10 knots to the East-North-East and rising to 981 hPa to be centered on the Celtic Sea.
For Marans :
Warning moderate gale offshore.
We are 80% sure of the situation, because the atmosphere might be less unstable and showers more frequent than forecast.
Sun but cloud increasing in the morning, sun and storm clouds in the afternoon. Some light showers in the morning, possibility of showers in the afternoon. In the evening, good clear periods but cloud building.
Risk of showers in the early hours. WSW force 4 becoming force 5 in the middle of the day then S force 3. Gusts reaching 31 knots in the middle of the day. Slight sea. Low, fairly long swell from W. Excellent visibility becoming poor in the evening.