High 1030 hPa centered at 120 nautical miles in the West of Fastnet Rock (South-West Ireland) moving at 30 knots to the East to be centered on Wales.
For Arcachon :
No gale warning.
We are 75% sure of the situation, because the high pressure system could move in more quickly than forecast.
Little cloud in the morning, hazy skies in the afternoon. No precipitation. In the evening, hazy skies.
No precipitation. ESE force 2 in the morning turning NNE in the evening. Gusts reaching 11 knots in the evening. Smooth sea. Low, fairly long swell from WNW. Good visibility becoming excellent in the middle of the day.