For La Tranche-sur-Mer :
No gale warning.
For the night from Tuesday to Wednesday W wind force 3 continuing all night. Gusts reaching 16 knots in the early part of the night.
Slight sea. Low, fairly long swell from W then from N at the end of the night. Excellent visibility becoming excellent in the middle of the night then good. Daytime of Wednesday 26 august : The atmosphere will remain unstable.
Skies changeable to very cloudy. Light showers all day. In the evening, cloudy spells, sometimes dense.
Light showers. WSW force 3 becoming force 4 in the middle of the day then W. Gusts reaching 17 knots in the evening. Slight sea. Low from N then fairly long from W in the evening. Good visibility becoming excellent in the middle of the day.