A northwesterly, weak and very variable flow prevails over the whole area.
For Calais :
No gale warning.
For the night from Wednesday to Thursday WNW force 2 in the early part of the night becoming NW force 3. Gusts reaching 16 knots in the early part of the night.
Slight sea. Low, short swell from N. Excellent visibility. Daytime of Thursday 20 august : The unsettled weather will become more unpredictable in the second half of the day.
Good clear periods alternating with cloudy spells, sometimes dense. Some showers from late morning. In the evening, cloudy spells, sometimes dense.
Light showers progressively becoming less frequent. NW force 3 in the morning becoming NNW force 2 in the evening. Gusts reaching 15 knots in the morning. Slight sea. Low, short swell from N. Excellent visibility.