A westerly, weak and particularly variable flow prevails over the whole area.
For Berck Plage :
No gale warning.
For the night from Wednesday to Thursday NNE wind force 2 continuing all night. Gusts reaching 17 knots in the early part of the night.
Smooth sea becoming smooth to slight at the end of the night. Low, short swell from N then from NNW at the end of the night. Good visibility temporarily in the middle of the night. Daytime of Thursday 20 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, rather dense in the morning. Risk of some spots of rain in the morning, no precipitation in the afternoon. In the evening, cloudy spells, sometimes dense.
Light showers. NNE force 2 turning NNW force 3 in the middle of the day then N. Gusts reaching 17 knots in the evening. Smooth to slight sea becoming slight in the evening. Low, short swell from NNW. Good visibility becoming excellent in the middle of the day.