A northeasterly and mostly variable flow prevails over the South of the basin. Over the North, it is westerly, moderate and particularly variable.
For Penthièvre :
No gale warning.
For the night from Thursday to Friday NE wind force 3 continuing all night. Gusts reaching 16 knots until the middle of the night.
Smooth to slight sea becoming slight in the middle of the night. Low from N. Excellent visibility. Daytime of Friday 18 september : The sky will remain changeable.
Cloud and long sunny periods. No precipitation. In the evening, cloud and long sunny periods.
Chance of light rain. NE force 3 becoming NNE force 2 in the middle of the day then N force 3. Gusts reaching 16 knots in the evening. Slight sea. Low from N. Good visibility becoming excellent in the middle of the day.