A northwesterly and particularly variable flow prevails over the whole area.
For Saint-Quay-Portrieux :
No gale warning.
For the night from Thursday to Friday NW force 3 in the early part of the night becoming force 2. Gusts reaching 15 knots in the early part of the night.
Slight sea. Low, short swell from NE. Excellent visibility becoming good in the middle of the night. Daytime of Friday 21 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Risk of showers in the morning, possibility of showers in the afternoon. In the evening, cloudy spells, sometimes dense.
Possibility of showers NW wind force 3 continuing all day. Gusts reaching 13 knots in the evening. Slight sea becoming smooth to slight in the middle of the day. Low, short swell from NE. Good visibility becoming excellent in the middle of the day.