For La Tranche-sur-Mer :
Warning fresh gale.
We are 85% sure of the situation, because in this type of situation, it is difficult to define precisely when the precipitation will begin.
Very cloudy skies to overcast. No precipitation in the morning, heavy showers towards the end of the day. In the evening, very cloudy skies to overcast.
Light showers. SSW force 5 becoming S force 6 in the middle of the day then WSW force 8. Gusts reaching 52 knots in the evening. Moderate sea becoming rough in the evening. Moderate, fairly long swell from W then low in the middle of the day then from N. Excellent visibility.