A southwesterly and particularly variable flow prevails over the whole area.
For Berck sternes :
No gale warning.
For the night from Saturday to Sunday WSW force 1 in the early part of the night becoming force 2. Gusts reaching 13 knots until the middle of the night.
Slight sea becoming smooth in the middle of the night. Low, short swell from W. Excellent visibility becoming excellent in the middle of the night then good. Daytime of Sunday 20 september : The weather will become more uncertain during the day.
Cloud and long sunny periods. No precipitation in the morning, possibility of showers in the afternoon. In the evening, cloud and long sunny periods.
Possibility of showers WSW force 2 becoming W force 3 in the middle of the day then WNW. Gusts reaching 13 knots in the middle of the day. Smooth sea. Low, short swell from W. Good visibility temporarily in the middle of the day.