Low 959 hPa centered at 200 nautical miles in the West-South-West of Ouessant moving at 9 knots to the North-East and rising to 965 hPa to be centered on the Celtic Sea.
For Montalivet :
Warning moderate gale offshore.
We are 75% sure of the situation, because the high pressure system could move in more quickly than forecast.
Good clear periods but cloud building. Light showers. In the evening, very cloudy skies to overcast.
Showers towards the end of the night. SW force 5 in the middle of the day becoming force 4 in the evening. Gusts reaching 37 knots in the middle of the day. Rough to very rough sea becoming very rough in the evening. Moderate, long swell from W then high in the evening. Excellent visibility.