For De Saint-Nazaire à Nantes :
No gale warning.
We are 80% sure of the situation, because storms may be more local.
Very cloudy skies to overcast. Heavy showers. In the evening, storms developing.
Showers with the possibility of hail. SW wind force 4 from the middle of the day. Gusts reaching 33 knots in the evening. Slight sea. Low, fairly long swell from WSW. Poor visibility becoming good in the evening.