For La Tranche-sur-Mer :
No gale warning.
We are 80% sure of the situation, because the high pressure system could move in more quickly than forecast.
Skies rapidly hazing over but becoming brighter in the afternoon. No precipitation. In the evening, hazy skies.
No precipitation. NW force 3 turning W force 4 in the middle of the day then WNW. Gusts reaching 18 knots in the middle of the day. Smooth to slight sea. Low, short swell from WSW. Good visibility becoming excellent in the middle of the day.