For Dinan-Lanvallay :
No gale warning.
For the night from Thursday to Friday NW force 2 in the early part of the night turning W force 1. Gusts reaching 13 knots in the early part of the night.
Slight sea becoming smooth to slight in the middle of the night. Low, short swell from NNE. Excellent visibility becoming good in the middle of the night then good. Daytime of Friday 21 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Possibility of showers late in the morning, showers late in the day. In the evening, cloudy spells, sometimes dense.
Light showers. WSW force 2 turning WNW force 3 in the middle of the day then NW. Gusts reaching 18 knots in the evening. Smooth to slight sea becoming slight in the evening. Low, short swell from NNE. Good visibility becoming excellent in the middle of the day.