For Berck sternes :
No gale warning.
For the night from Thursday to Friday WNW force 2 turning WSW force 1 in the middle of the night then W. Gusts reaching 15 knots at the end of the night.
Smooth to slight sea temporarily slight in the middle of the night. Low, short swell from NW. Excellent visibility becoming excellent at the end of the night. Daytime of Friday 21 august : The atmosphere will remain unstable.
Skies changeable to very cloudy. Light showers all day. In the evening, cloudy spells, sometimes dense.
Light showers progressively becoming less frequent. W force 2 in the morning becoming WNW force 3 in the middle of the day. Gusts reaching 17 knots in the evening. Smooth to slight sea. Low, short swell from N. Excellent visibility becoming excellent in the middle of the day.