REGIONAL SUMMARY:
In the eighth week of 2025, the ASEAN region experienced 18 disasters, including floods, landslides, storms, and wind-related disasters across Indonesia, Malaysia, the Philippines, and Thailand. According to Indonesia’s Indonesia’s Badan Nasional Penanggulangan Bencana (BNPB), the provinces of East Java, West Java, Lampung, Central Java, South Sulawesi, South Sumatra, Yogyakarta, and East Kalimantan experienced flooding, storms, and wind-related disasters. In Malaysia, the Agensi Pengurusan Bencana Negara (NADMA) reported the occurrence of flooding in Negeri Sembilan and Pahang, and landslides in Sarawak. In the Philippines, the National Disaster Risk Reduction and Management Council (NDRRMC) and Department of Social Welfare and Development (DSWD) reported flooding in North Cotabato and Agusan del Sur. Lastly, in Thailand, the Department of Disaster Prevention and Mitigation (DDPM) reported storms in Phayao and Chiang Rai in the Northern Region.
HIGHLIGHT:
In Indonesia, high intensity rain triggered significant flooding in Lampung Province. According to the BNPB report, 9.4K houses were inundated in Bandar Lampung City, which caused one death and affected 9.4K families (about 37.4K persons). In addition, the flooding also affected a national road, education facility, and public facility, including 10 collapsed retaining walls. According to the update from BNPB, floods continue to inundate roads and people’s houses in several subdistricts. Authorities have immediately evacuated residents and conducted assessment in the affected areas.
HYDRO-METEO-CLIMATOLOGICAL:
For the past week, data from the ASEAN Specialised Meteorological Centre (ASMC) indicated medium to high 7-day average rainfall across the Maritime Continent, which includes including Brunei Darussalam, Indonesia, Malaysia, and central and southern Philippines. As of this report, Tropical Cyclone Bianca (formerly Invest 99S) is being monitored southwest of Cilacap, Indonesia. It is currently moving south-southwest away from Indonesian territory (BMKG).
GEOPHYSICAL:
Six (6) significant earthquakes (M>5.0) were recorded by Indonesia’s Badan Meteorologi, Klimatologi, dan Geofisika (BMKG). As of reporting, Lewotobi Laki-laki (Alert Level III), Ibu (Alert Level III), Dukono (Alert Level II), Marapi (Alert Level II), and Semeru (Alert Level II) in Indonesia, have shown recent volcanic activity according to Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG). In the Philippines, Kanlaon (alert level 3), Taal (alert level 1), and Mayon (alert level 1) volcanoes have also reported recent volcanic activity, according to the Philippine Institute of Volcanology and Seismology (PHIVOLCS).
OUTLOOK:
According to the ASEAN Specialised Meteorological Centre (ASMC), for the coming week, wetter conditions are predicted over much of the Maritime Continent. No significant regional temperature anomalies are predicted. For the regional assessment of extremes, there is a small increase in chance of very heavy rainfall over parts of the western Maritime Continent, in particular, southern Thailand, Peninsular Malaysia, northern Sumatra, and northwestern Borneo. There is also a small increase in chance of very heavy rainfall over Sulawesi and the Maluku Islands, mainly over the sea around the region. La Niña-like conditions is now present. La Niña conditions tend to bring wetter than average conditions to much of the Maritime Continent at the seasonal timescale during the Northeast Monsoon period and to much of the ASEAN region during the subsequent intermonsoon period.
Sources:
ASEAN Disaster Monitoring & Response System (DMRS); ASEAN Specialised Meteorological Centre (ASMC); Joint Typhoon Warning Centre (JTWC);
Indonesia: BNPB, BMKG, PVMBG;
Malaysia: NADMA;
Philippines: NDRRMC, PHIVOLCS, DSWD;
Thailand: DDPM;
Various news agencies.
