BMKG Asks Sea Transportation In Nias-Aceh To Beware Of 6 Meters High Waves As Of Thursday This Week

The voyage of the Ternate-Jailolo West Halmahera fast boat is constrained by high waves leaning at the Port of Dufa-Dufa Ternate. (Between-Abdul Fatah)

JAKARTA - The Meteorology, Climatology and Geophysics Agency (BMKG) has given an early warning of the potential for high waves of 2.5-6 meters in most parts of Indonesian waters on August 11-14, 2025.

BMKG's Director of Maritime Meteorology, Eko Prasetyo, said that ship shipping activity actors are expected to be aware of this early warning.

Quoting Antara, Monday, August 11, Eko said the atmospheric conditions and local wind patterns formed in Indonesian waters triggered an increase in wave height that could endanger shipping safety.

Wind patterns in northern Indonesia generally move from southeast to southwest at a speed of 630 knots, while in the south it moves from east to southeast with wind speeds ranging from 4-25 knots.

The highest wind speed was observed in the Malacca Strait, Karimata Strait, North Natuna Sea, West Indian Ocean Bengkulu, Sulawesi Sea, Pacific Ocean north of Maluku and Arafuru Sea.

BMKG predicts waves as high as 1.25 2.5 meters are likely to occur in the North Natuna Sea, eastern Java Sea, Flores Sea, southern Makassar Strait, northern Makassar Strait, central Sulawesi Sea, Banda Sea, Seram Sea, Pacific Ocean north of West Papua Pacific Ocean north of Papua.

Furthermore, the Arafuru Sea (northern, east, west, central), northern Karimata Strait, Bali Sea, Sawu Sea, central Makassar Strait, Sulawesi Sea (west, east), Maluku Sea, North Pacific Ocean Maluku, Pacific Ocean north of Southwest Papua.

Meanwhile, higher waves, ranging from 2.5'4 meters, have the potential to occur in the northern part of the Malacca Strait, the western Indian Ocean of the Nias Islands, the western Indian Ocean of Bengkulu, the Indian Ocean (south of Banten, south of Central Java, south of East Java, south of NTB, west of Aceh, west of Mentawai Islands, west of Lampung, south of West Java, south of Yogyakarta, south of Bali, and south of NTT).

For extreme waves as high as 4'6 meters, the BMKG also warned in the western Indian Ocean region of the Nias Islands, west of Mentawai, and western waters of Aceh as the most risky area in the forecast period.

BMKG appealed to the public and shipping activities to increase vigilance, especially fishermen boats, barges, ferries, and cargo or cruise ships that can be directly affected by wind speeds and extreme wave heights.