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.
Mist and fog in the morning, fog clearing in early afternoon. No precipitation. In the evening, skies with few clouds.
ESE force 3 in the morning turning NE force 2 in the evening. Slight sea. Low, fairly long swell from WSW. Visibility reduced by fog becoming reduced by mist in the middle of the day then good.