BMKG: New Moon on Jan. 19 May Trigger Coastal Floods in Indonesia

TEMPO.CO, Jakarta - The Indonesian Meteorology, Climatology, and Geophysics Agency (BMKG) has mentioned the occurrence of the new moon phase on January 19, 2026, which has the potential to increase the maximum sea level height, triggering coastal floods or tidal floods.

The Director of Maritime Meteorology at BMKG, Eko Prasetyo, stated that based on the observation of water level data and tidal predictions, tidal floods are likely to occur in several coastal regions in Indonesia.

These regions include the coasts of North Sumatra, the Riau Islands, West Sumatra, Jambi, the Bangka Belitung Islands, Banten, Jakarta, West Java, Central Java, East Java, West Nusa Tenggara, East Kalimantan, South Kalimantan, Central Kalimantan, and West Kalimantan.

"Potential coastal floods generally impact the activities of communities around ports and coastal areas, such as loading and unloading activities at ports, activities in coastal settlements, as well as salt pond and inland fishing activities," Eko said in a written statement on Tuesday, January 13, 2025.

Eko urged the public to remain vigilant and prepared to anticipate the impacts of maximum high tides. "It is also important to pay attention to maritime weather updates from BMKG," he added.

Locations and Time of Potential Tidal Floods

1. North Sumatra Coast

Medan Belawan, Medan Labuhan, and Medan Marelan coasts from January 19 to 23, 2026

2. Riau Islands Coast

-Batam coast from January 19 to 24, 2026
-Dabo Singkep coast from January 16 to 22, 2026
-Karimun coast from January 17 to 23, 2026
-Bintan coast from January 18 to 24, 2026
-Tanjung Pinang coast from January 16 to 24, 2026
-Natuna coast from January 16 to 21, 2026
-Anambas coast from January 16 to 20, 2026

3. West Sumatra Coast

Coast of Padang city, Padang Pariaman Regency, Pesisir Selatan Regency, and Mentawai Islands Regency from January 17 to 22, 2026

4. Jambi Coast

Selat Berhala from January 18 to 21 and 26 to 31, 2026

5. Bangka Belitung Islands Coast

Bangka and Belitung coasts from January 18 to 20, 2026

6. Banten Coast

-Northern waters of Tangerang (Teluk Naga and Kosambi sub-districts) from January 13 to 21 and 27 to 31, 2026
-Northern waters of Serang (Kasemen, Pontang, and Tirtayasa sub-districts) from January 19 to 20 and 30, 2026
-West Sunda Strait of Pandeglang (Labuan sub-district) on January 31, 2026
-Southern waters of Pandeglang (Cikeusik sub-district) from January 18 to 22 and 26 to 31, 2026
-Southern waters of Lebak (Bayah sub-district) from January 18 to 22 and 26 to 31, 2026

7. Jakarta Coast

Coasts of Kamal Muara, Kapuk Muara, Pluit, Ancol, Kamal, Marunda, Cilincing, Tanjung Priok, Kalibaru, Muara Angke, and Penjaringan from January 13 to 20, 2026, and January 28 to February 3, 2026

8. West Java Coast

-Bekasi Regency and Karawang Regency from January 13 to 20, 2026, and January 28 to February 3, 2026
-Southern coast of West Java (Cianjur, Sukabumi, Garut, Tasik, Pangandaran) from January 19 to 22, 2026, and January 31 to February 5, 2026

9. Central Java Coast

-Coasts of Semarang, Demak, Pekalongan city, Pekalongan Regency, Batang, Kendal, Jepara, and Brebes Regency from January 15 to 22, and 29 to 31, 2026
-Coasts of Tegal city, Tegal Regency, and Pemalang Regency from January 16 to 22, and 29 to 31, 2026

10. East Java Coast

-Western coasts of Surabaya (Tuban, Lamongan, Gresik) from January 16 to 19, 2026
-Surabaya port from January 16 to 20, and 30 to 31, 2026

11. West Nusa Tenggara Coast

Coasts of Lombok and Bima from January 11 to 31, 2026

12. East Kalimantan Coast

-Eastern coast of Balikpapan from January 15 to 27, and 30 to 31, 2026
-Western coast of Balikpapan from January 18 to 22, 2026

13. South Kalimantan Coast

-Barito Kuala, Banjar, Banjarmasin, and Tanah Laut coasts from January 17 to 21, and 30 to 31, 2026
-Kotabaru and Tanah Bumbu coasts from January 17 to 24, and 31, 2026

14. Central Kalimantan Coast

-Coasts of Kumai, Lunci Beach, and Kuala Jelai from January 15 to 25, and 29 to 31, 2026
-Coasts of Kuala Pembuang and Sampit from January 16 to 24, and 29 to 31, 2026

15. West Kalimantan Coast

Coasts of Kapuas River and Pontianak city from January 15 to 23, and 30 to 31, 2026

Read: Tidal Flood Hits North Jakarta Coastal Areas

Click here to get the latest news updates from Tempo on Google News