A northwesterly, weak and very variable flow prevails over the whole area.
For Berck sternes :
No gale warning.
For the night from Friday to Saturday NE force 3 in the early part of the night turning NW force 2. Gusts reaching 16 knots in the early part of the night.
Smooth to slight sea becoming slight in the middle of the night. Low, fairly long swell from W. Excellent visibility becoming good at the end of the night. Daytime of Saturday 22 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 progressively becoming less frequent. NW force 2 becoming force 3 in the middle of the day then NNW. Gusts reaching 15 knots in the morning. Slight sea becoming smooth to slight in the evening. Low, short swell from W. Good visibility becoming excellent in the middle of the day.