A northerly, weak and very variable flow prevails over the South-East of the basin. Over the West and the North, it is southwesterly, strong and very variable.
For Pornichet :
No gale warning.
We are 80% sure of the situation, because the high pressure system could move in more quickly than forecast.
Good clear periods alternating with cloudy spells, rather dense in the morning. No precipitation. In the evening, changeable skies becoming less cloudy.
No precipitation. WSW wind force 3 continuing all day. Gusts reaching 17 knots in the middle of the day. Smooth to slight sea. Low, fairly long swell from WSW. Excellent visibility becoming good in the evening.