For Koumac :
No gale warning.
The reliability of the situation is good.
Very cloudy in the morning, sunny becoming changeable in the afternoon. No precipitation. In the evening, very cloudy skies becoming totally overcast.
Light rain in the early hours. N force 2 freshening SSW force 4 in the middle of the day then becoming SE. Gusts reaching 19 knots in the evening. Slight sea. Low, fairly long swell from S. Good visibility becoming excellent in the middle of the day then good.