For Koumac :
No gale warning.
The reliability of the situation is good.
Very cloudy skies with short clear spells. No precipitation. In the evening, good clear periods but cloud building.
No precipitation. NE force 3 turning N in the middle of the day then NNE force 2. Gusts reaching 12 knots in the morning. Slight sea. Low, short swell from SSE. Poor visibility becoming excellent in the middle of the day.