A southwesterly, very strong and mostly variable flow prevails over the whole area.
For Les Trois Pierre à Oléron :
No gale warning.
We are 90% sure of the situation, because flows might be far more disturbed than forecast.
Dense and persistent fog in the morning, very cloudy skies to overcast in the afternoon. The risk of seeing rain will remain low. In the evening, very cloudy.
No precipitation. ESE force 3 in the morning turning SSE in the evening. Gusts reaching 16 knots in the middle of the day. Slight sea. Low, fairly long swell from W. Visibility reduced by dense fog becoming good in the middle of the day then excellent.