For U 171 wreck :
No gale warning.
We are 90% sure of the situation, because the high pressure system could move in more quickly than forecast.
Fair weather with mostly clear skies. In the evening, clear skies.
S force 2 in the middle of the day turning NNW in the evening. Gusts reaching 9 knots in the middle of the day. Slight sea. Low, fairly long swell from WSW. Poor visibility becoming poor in the evening.