A northerly and particularly variable flow prevails over the whole area.
For Calais :
No gale warning.
The reliability of the situation is poor.
For the night from Thursday to Friday WSW force 3 in the early part of the night turning N force 2. Gusts reaching 17 knots in the early part of the night.
Slight sea. Low, short swell from WSW. Excellent visibility temporarily in the middle of the night. Daytime of Friday 21 august : The unsettled weather will become more unpredictable in the second half of the day.
Good clear periods alternating with cloudy spells, sometimes dense. Risk of showers in the morning, light showers in the afternoon. In the evening, good clear periods but cloud building.
Light showers. W force 2 turning NW in the middle of the day then NNE. Gusts reaching 15 knots in the middle of the day. Slight sea becoming smooth to slight in the middle of the day. Low, short swell from WSW. Good visibility becoming excellent in the middle of the day.