A southwesterly, very strong and very variable flow prevails over the whole area.
For Pornichet :
Warning fresh gale offshore.
The reliability of the situation is assessed at 80%.
Overcast and misty, reduced visibility. Rain. In the evening, overcast skies.
Light showers. SW wind force 6 from the middle of the day. Gusts reaching 48 knots in the evening. Moderate sea. Moderate, fairly long swell from SW then low from SSE in the evening. Visibility reduced by mist becoming excellent in the evening.