Low 990 hPa centered at 190 nautical miles in the South-South-West of Fastnet Rock (South-West Ireland) moving at 30 knots to the East-North-East and dropping to 976 hPa to be centered on the South-West of England.
For Piriac-sur-Mer :
Warning fresh gale offshore.
We are 90% sure of the situation, because hail may not be as easy to predict.
Changeable skies completely clouding over during the morning, overcast skies with storms likely in the afternoon. No precipitation in the morning, showers with possibility of hail in the afternoon. In the evening, very cloudy with risk of storms.
Violent showers . warning: hail! NNE force 1 freshening S force 4 in the middle of the day then SW force 6. Gusts reaching 45 knots in the evening. Slight sea becoming moderate in the evening. Low, fairly long swell from WSW. Visibility reduced by mist becoming good in the middle of the day then excellent.