A northeasterly and mostly variable flow prevails over the South of the basin. Over the North, it is southwesterly, moderate and very variable.
For Biarritz :
No gale warning.
For the night from Thursday to Friday NW force 1 in the early part of the night turning S. Gusts reaching 5 knots in the early part of the night.
Slight sea. Low, short swell from NW. Poor visibility becoming poor in the middle of the night then poor. Daytime of Friday 18 september : Warning:reduced visibility early in the day.
Sunny spells with possibility of mist forming in the morning, predominantly sunny in the afternoon. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, skies with few clouds.
S force 1 freshening NNW force 3 in the middle of the day then force 2. Slight sea becoming moderate in the evening. Low, fairly long swell from NW then moderate in the evening. Visibility reduced by mist becoming excellent in the middle of the day then good.