BMKG said wind and sea wave conditions that pose a high risk to sailing safety are fishing boats if the wind speed is more than 15 knots and the wave height is above 1.25 meters.
Barges if the wind speed is more than 16 knots and the wave height is above 1.5 meters, ferries if the wind speed is more than 21 knots and the wave height is above 2.5 meters.
