A southerly and very variable flow prevails over the whole area.
For Calais :
No gale warning.
We are 85% sure of the situation, because the high pressure system could move in more quickly than forecast.
For the night from Wednesday to Thursday SW force 4 in the early part of the night becoming force 3. Gusts reaching 21 knots in the early part of the night.
Smooth to slight sea. Low, short swell from W. Excellent visibility becoming excellent at the end of the night. Daytime of Thursday 21 may : The sky will remain changeable.
Cloudy spells, dense at times in the morning, skies becoming progressively hazier during the afternoon. No precipitation. In the evening, fair weather with mostly clear skies.
SW force 3 in the morning turning NNW force 2 in the evening. Gusts reaching 15 knots until the middle of the day. Smooth to slight sea becoming smooth in the middle of the day. Low, short swell from W. Excellent visibility becoming excellent in the middle of the day.