For Koumac :
No gale warning.
The reliability of the situation is good.
Skies changeable to very cloudy. Light showers progressively dying out in the morning, possibility of showers in the afternoon. In the evening, very cloudy.
Light showers progressively becoming less frequent. WSW force 4 in the morning turning SSW in the evening. Gusts reaching 24 knots in the middle of the day. Rough sea becoming moderate in the evening. Moderate, fairly long swell from SW. Excellent visibility.