A northeasterly and very variable flow prevails over the South of the basin. Over the North, it is westerly, weak and particularly variable.
For Saint-Denis-D"Oleron :
No gale warning.
For the night from Wednesday to Thursday N force 3 in the early part of the night turning NE. Gusts reaching 16 knots in the early part of the night.
Slight sea temporarily smooth to slight in the middle of the night. Low, short swell from WNW then from N in the middle of the night. Excellent visibility. Daytime of Thursday 20 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Possibility of showers late in the morning, showers late in the day. In the evening, cloudy spells, sometimes dense.
Light showers progressively becoming less frequent. NE force 3 in the morning turning NNW in the middle of the day. Gusts reaching 16 knots in the morning. Slight sea. Low, fairly long swell from W. Excellent visibility.