For De Saint-Nazaire à Nantes :
No gale warning.
We are 80% sure of the situation, because the atmosphere might be less unstable and showers rarer than forecast.
Overcast skies. Showers all day. In the evening, very cloudy skies to overcast.
Light showers. S force 3 in the morning temporarily SSE force 4 in the middle of the day. Gusts reaching 25 knots in the middle of the day. Slight sea. Low, fairly long swell from WSW. Poor visibility becoming excellent in the middle of the day then poor.