High 1029 hPa centered on Switzerland moving at 49 knots to the West-North-West and weakening to 1026 hPa to be centered on the Celtic Sea.
For Gravelines :
No gale warning.
We are 90% sure of the situation, because the high pressure system could move in more quickly than forecast.
Clear skies becoming somewhat cloudy. In the evening, clear spells, risk of mist forming.
No precipitation. W force 3 in the middle of the day turning SW in the evening. Gusts reaching 17 knots in the middle of the day. Smooth to slight sea. Low, short swell from WNW. Excellent visibility becoming reduced by mist in the evening.