A northeasterly and very variable flow prevails over the whole area.
For Biarritz :
No gale warning.
For the night from Wednesday to Thursday WSW force 2 in the early part of the night becoming SW force 1. Gusts reaching 6 knots in the early part of the night.
Slight sea. Low, short swell from NW. Good visibility becoming poor at the end of the night. Daytime of Thursday 20 august : The atmosphere will remain unstable.
Good clear periods alternating with cloudy spells, sometimes dense. Light showers all day. In the evening, cloudy spells, sometimes dense.
Light showers. SW force 1 turning NW force 2 in the middle of the day then WNW. Gusts reaching 8 knots in the evening. Slight sea. Low, fairly long swell from NW. Poor visibility becoming excellent in the middle of the day then good.