BMKG warns of 4-meter high waves in East Java waters

The Meteorology, Climatology, and Geophysics Agency (BMKG) in Tanjung Perak, Surabaya, has issued an early warning for high waves in several waters of East Java, Indonesia. These waves could reach up to 4 meters in height and are expected to persist for several days, until June 11, 2026.

Sutarno, the Coordinator for Observation and Information at BMKG Maritim Tanjung Perak, explained that the surge in wave height is caused by strong monsoon winds blowing consistently from the east to southeast. These winds are blowing at speeds of 5 to 25 knots, contributing to the elevated wave conditions.

The BMKG has mapped two danger zones within East Java's waters. Moderate waves, ranging from 1.25 to 2.5 meters, are anticipated in areas like the Masalembo Waters, northern and southern Bawean Waters, Tuban Waters, Lamongan Waters, and northern Gresik Waters. This also includes coastal areas of Madura, such as the northern waters of Bangkalan, Sampang, Pamekasan, Sumenep, and the northern, eastern, and southern parts of the Sapudi and Kangean Islands.

More extreme wave conditions, between 2.5 and 4 meters, are predicted along the southern coast of East Java, affecting the waters of Pacitan, Trenggalek, Tulungagung, Blitar, Malang, Lumajang, Jember, and Banyuwangi. Despite generally clear to cloudy skies over the waters, BMKG urges all maritime activities to exercise caution. Specific guidelines are provided: fishing boats should be alert at 15 knots wind speed and 1.25-meter waves, while larger vessels like barges should be cautious at 16 knots and 1.5 meters. Ferry services face heightened risk and should increase vigilance if winds reach 21 knots and waves 2.5 meters.