A northeasterly and variable flow prevails over the South-West of the basin. Over the North and the East, it is southwesterly, moderate and variable.
For Penthièvre :
No gale warning.
We are 75% sure of the situation, because the high pressure system could move in more quickly than forecast.
For the night from Friday to Saturday NNE force 3 in the early part of the night becoming NE force 2. Gusts reaching 11 knots in the early part of the night.
Smooth to slight sea. Low, short swell from WSW. Excellent visibility becoming good in the middle of the night then poor. Daytime of Saturday 12 september : Improving during the day:the sky will clear.
Sun but cloud increasing in the morning, sunny in the afternoon. No precipitation. In the evening, skies with few clouds.
ENE force 2 turning WSW force 3 in the middle of the day then WNW. Gusts reaching 11 knots in the evening. Smooth to slight sea. Low, short swell from W. Poor visibility becoming excellent in the middle of the day then good.