For La Tranche-sur-Mer :
No gale warning.
We are 90% sure of the situation, because the high pressure system could move in more quickly than forecast.
Clear skies. In the evening, relatively clear skies becoming changeable.
SE wind force 3 from the middle of the day. Gusts reaching 16 knots in the middle of the day. Smooth to slight sea. Low, fairly long swell from W. Excellent visibility becoming good in the evening.