A northerly, moderate and very variable flow prevails over the South and the East of the basin. Over the North-West, it is southwesterly, moderate and particularly variable.
For La Tranche-sur-Mer :
No gale warning.
The reliability of the situation is poor.
For the night from Sunday to Monday NW force 3 in the early part of the night becoming NNW force 2. Gusts reaching 15 knots in the early part of the night.
Smooth to slight sea. Low, short swell from WNW. Excellent visibility becoming excellent in the middle of the night then good. Daytime of Monday 17 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, cloudy spells, sometimes dense.
No precipitation. N force 2 in the morning turning NW force 3 in the middle of the day. Gusts reaching 17 knots in the evening. Smooth to slight sea. Low, short swell from WNW. Good visibility becoming excellent in the middle of the day.