Skies progressively clouding over with storms forming.Showers towards the end of the night.In the evening, warning: storms: considerable electrical activity. Heavy showers. SSE force 2 in the middle of the day turning NW force 3 in the evening. Gusts reaching 11 knots in the evening. Smooth to slight sea. Low, short swell from E. Excellent visibility becoming reduced by mist in the evening.