For Mentawai Islands :
No gale warning.
The reliability of the situation is good.
Stormy day. Showers all day. In the evening, storms developing.
Showers. NW wind force 4 continuing all day. Gusts reaching 23 knots in the middle of the day. Moderate sea. Low, fairly long swell from SSW then moderate, long swell in the evening. Excellent visibility.