A northerly, weak and variable flow prevails over the South-West of the basin. Over the South-East, it is easterly, weak and variable. Over the North, it is southerly, moderate and very variable.
For La Tranche-sur-Mer :
No gale warning.
The reliability of the situation is fairly good.
For the night from Wednesday to Thursday NW force 2 in the early part of the night becoming force 1. Gusts reaching 10 knots in the early part of the night.
Smooth to slight sea. Low, fairly long swell from W. Excellent visibility. Daytime of Thursday 13 august : The weather will be good.
Warm sun all day. In the evening, skies with few clouds.
WNW force 2 becoming W force 3 in the middle of the day then NW. Gusts reaching 18 knots in the evening. Smooth to slight sea becoming slight in the middle of the day. Low, fairly long swell from W. Excellent visibility.