A northeasterly, moderate and variable flow prevails over the South of the basin. Over the North, it is westerly, moderate and particularly variable.
For La Tranche-sur-Mer :
No gale warning.
For the night from Tuesday to Wednesday NW force 3 becoming NNW force 2 in the middle of the night then N. Gusts reaching 16 knots in the early part of the night.
Slight sea. Low, short swell from W. Excellent visibility becoming good in the middle of the night then good. Daytime of Wednesday 19 august : The sky will remain changeable.
Cloud and long sunny periods. No precipitation. In the evening, cloudy spells, sometimes dense.
Risk of showers in the early hours. N force 2 turning WNW force 3 in the middle of the day then NW. Gusts reaching 17 knots in the evening. Slight sea. Low, short swell from WNW. Good visibility becoming excellent in the middle of the day then excellent.