For Koumac :
No gale warning.
The reliability of the situation is good.
Very cloudy skies to overcast. Chance of light rain. In the evening, very cloudy skies clearing completely.
Possibility of showers S force 3 in the middle of the day turning NE in the evening. Gusts reaching 13 knots in the evening. Slight sea. Low, short swell from SSE. Excellent visibility becoming poor in the evening.