For Sumatra SE tips :
No gale warning.
The reliability of the situation is good.
Very cloudy with risk of thunderstorms in the morning, storms developing in the afternoon. Showers all day. In the evening, storms developing.
 Heavy showers. W wind force 3 continuing all day. Gusts reaching 17 knots in the middle of the day. Moderate sea. Moderate, fairly long swell from SSW then low in the evening. Good visibility becoming good in the middle of the day then reduced by mist.