High 1019 hPa centered on West Channel moving at 7 knots to the North-North-West to be centered on the South-West of England.Low 1008 hPa centered at 130 nautical miles in the South-West of Fastnet Rock (South-West Ireland) moving at 7 knots to the West-North-West.
For Portsall :
No gale warning.
We are 90% sure of the situation, because the high pressure system could move in more quickly than forecast.
Lots of cloud dispersing during the morning, sunny in the afternoon. No precipitation. In the evening, fair weather with mostly clear skies.
SW wind force 3 continuing all day. Gusts reaching 18 knots in the middle of the day. Smooth to slight sea. Low, fairly long swell from WNW. Good visibility becoming excellent in the middle of the day then good.