High Waves Up To 4 Meters On November 6'8, Fishermen In North Sumatra Asked To Postpone To Go To Sea

Illustration of traditional fishermen hit by high sea waves to find fish. (Between)

The Belawan Medan Maritime Class II Meteorological Station reminds fishermen and stakeholders to be aware of the potential for high waves of up to four meters in a number of waters of North Sumatra on November 6, 2025.

Head of Belawan Maritime Meteorological Station, Christen Ordain Novena Marpaung said four-meter high waves are expected to occur in the western waters of North Sumatra, the western waters of the Batu Islands, the western waters of the Nias Islands, and the western Indian Ocean of the Nias Islands.

Meanwhile, the eastern waters of the Nias Islands and the waters of the Batu Islands also have the potential to be hit by high waves of up to 2.5 meters.

The wind pattern in northern Indonesia generally moves from southwest to northwest with wind speeds of 430 knots. While in the south it moves from east to south at a speed of 425 knots," Christen said in Medan, Antara, Wednesday, November 5.

He emphasized that this condition needs to be watched out for because it can endanger shipping activities. Sea waves with a height of 1.25 meters and wind speeds of 15 knots are already at risk for fishing boats.

If the wind speed reaches 16 knots and waves are 1.5 meters, then barges need to be vigilant. For ferries, the risk increases when wind speed reaches 21 knots and wave height of 2.5 meters," he said.

BMKG appealed to fishermen and shipping operators to pay attention to daily sea weather forecasts and delay departures if conditions were not possible.