Low 976 hPa centered at 40 nautical miles in the South-East of the isles of Scilly moving at 27 knots to the East and rising to 981 hPa to be centered on the Dover Strait.
For Arcachon :
Warning moderate gale offshore.
We are 70% sure of the situation, because the high pressure system could move in more quickly than forecast.
Very cloudy skies with short clear spells. Light showers all day. In the evening, very cloudy skies to overcast.
No precipitation. W force 3 in the morning becoming WSW force 4 in the middle of the day. Gusts reaching 27 knots in the evening. Smooth sea becoming smooth to slight in the evening. Low, fairly long swell from WNW. Good visibility becoming excellent in the middle of the day.