A northerly, weak and particularly variable flow prevails over the whole area.
For Saint-Valery-en-Caux :
No gale warning.
For the night from Thursday to Friday NW force 2 turning N force 1 in the middle of the night then NNE. Gusts reaching 13 knots in the early part of the night.
Slight sea. Low, short swell from WNW. Good visibility becoming good in the middle of the night then poor. Daytime of Friday 21 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, cloud and long sunny periods.
No precipitation. NNE force 2 in the morning becoming N force 3 in the middle of the day. Gusts reaching 11 knots. Moderate sea. Low, short swell from WNW. Poor visibility becoming excellent in the middle of the day then excellent.