For Dinan-Lanvallay :
No gale warning.
For the night from Tuesday to Wednesday NNW force 3 becoming NW force 2 in the middle of the night then force 1. Gusts reaching 13 knots in the early part of the night.
Smooth sea. Low, fairly long swell from NW. Excellent visibility becoming good in the middle of the night then good. Daytime of Wednesday 19 august : The sky will remain changeable.
Good clear periods alternating with cloudy spells, sometimes dense. Possibility of showers late in the morning, possibility of showers in the afternoon. In the evening, cloudy spells, sometimes dense.
Chance of light rain. NW force 2 becoming NNW force 3 in the middle of the day then N. Gusts reaching 16 knots in the evening. Smooth sea becoming smooth to slight in the middle of the day then slight. Low, fairly long swell from WNW then from N in the middle of the day. Poor visibility becoming excellent in the middle of the day.