A southwesterly, very strong and very variable flow prevails over the whole area.
For Penthièvre :
Warning strong gale offshore.
The reliability of the situation is assessed at 75%.
Skies very cloudy to overcast in the morning, cloudy spells, sometimes dense, in the afternoon. Some showers in the morning, possibility of a few spots in the afternoon. In the evening, good clear periods but cloud building.
No precipitation. WNW force 9 weakening force 7 in the middle of the day then force 6. Gusts reaching 71 knots in the morning. High sea becoming very rough in the middle of the day then rough to very rough. Low, long swell from SE then moderate from SW in the middle of the day then, fairly long swell from WSW. Excellent visibility.