A northeasterly and variable flow prevails over the South of the basin. Over the North-West, it is southwesterly, moderate and variable. Over the North-East, it is northwesterly, moderate and very variable.
For Portonovo :
No gale warning.
We are 75% sure of the situation, because the high pressure system could move in more quickly than forecast.
Overcast in the morning, increasing sunny spells in the afternoon. Drizzle, which will start to fall late in the morning, will gradually die out. In the evening, clear spells, risk of mist forming.
No precipitation. SE force 2 turning SW in the middle of the day then NW. Gusts reaching 9 knots from the middle of the day. Slight sea. Low, long swell from WNW. Good visibility becoming good in the middle of the day then reduced by mist.