REGIONAL SUMMARY:
During the eighteenth week of 2026, a total of 55 disaster events were reported across the ASEAN region, including floods, landslides, storms, volcanic activity, and wind-related disasters in Indonesia, Malaysia, Philippines, Thailand, and Viet Nam. In Indonesia, Badan Nasional Penanggulangan Bencana (BNPB) reported disaster incidents across Gorontalo, Jakarta, West Java, Central Java, West Kalimantan, Central Kalimantan, East Kalimantan, East Nusa Tenggara, South Sumatra, and North Sumatra. In Malaysia, the Agensi Pengurusan Bencana Negara (NADMA) reported floods in Johor. In the Philippines, the National Disaster Risk Reduction and Management Council (NDRRMC) reported increased volcanic activity in Albay, which started from Week 2 of 2026. Meanwhile, in Thailand, the Department of Disaster Prevention and Mitigation (DDPM) reported storms and winds in Amnat Charoen, Bangkok Metropolis, Chaiyaphum, Chiang Rai, Lampang, Phetchabun, Phrae, Saraburi, Sukhothai, Surin, Ubon Ratchathani, and Uthai Thani. Lastly, in Viet Nam, Viet Nam Disaster and Dyke Management Authority (VDDMA) reported storms and wind-related disasters in Thanh Hoa and Thai Nguyen.
HIGHLIGHT:
In the Philippines, heightened activity of Mayon Volcano triggered a lava collapse that generated pyroclastic density currents (PDCs) along the Mi-isi Gully, followed by a minor strombolian eruption. The event produced sustained ash emissions, rockfalls, and localised ashfall affecting multiple municipalities in Albay Province, including Camalig, Guinobatan, and Ligao. Approximately 280.3K people (68.8K families) across 156 barangays have been affected, with lava flows extending up to 3.8 km from the crater. Authorities have advised residents within an 8-km radius to remain prepared for possible evacuation, while aviation authorities warned against flights near the summit due to ash hazards. Government response efforts have intensified, with the NDRRMC – Office of Civil Defense (OCD) leading the coordination, deploying hygiene kits, goggles, water, and fuel assistance, while inter-agency teams conduct road clearing and ashfall flushing operations to ensure public safety and maintain critical access routes.
HYDRO-METEO-CLIMATOLOGICAL:
For the past week, data from the ASEAN Specialised Meteorological Centre (ASMC) indicated medium to high 7-day average rainfall across Cambodia, Indonesia, Lao PDR, Malaysia, Myanmar, Philippines, Thailand, and Viet Nam. As of this reporting, INVEST 93W is being monitored about 2,815 km east of Northeastern Mindanao. According to PAGASA, this system has Medium potential to develop into a tropical depression within 24 hours.
GEOPHYSICAL:
Three (3) significant earthquakes (M>5.0)were recorded by Indonesia’s Badan Meteorologi, Klimatologi, dan Geofisika (BMKG). Mount Semeru (alert level III), Dukono (alert level II), and Ibu (alert level II) in Indonesia, and Taal (alert level 1), Mayon (alert level 3), Bulusan (alert level 1), and Kanlaon (alert level 2) volcanoes in the Philippines reported recent volcanic activity according to Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) and the Philippines 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 southern Maritime Continent; drier-than-usual conditions are expected across much of central and southern Mainland Southeast Asia, as well as parts of the western Maritime Continent. Warmer-than-usual temperatures are also forecast over much of central and southern Mainland Southeast Asia and across most of the northern half of the Maritime Continent. There is no increased likelihood of very heavy rainfall across the region. However, there remains a slight increase in the likelihood that extreme heat conditions will persist over parts of the Malay Peninsula. ENSO-neutral conditions are now present.
Sources:
ASEAN Disaster Monitoring & Response System (DMRS); ASEAN Disaster Information Network (ADINet); ASEAN Specialised Meteorological Centre (ASMC); ASEAN Earthquake Information Centre (AEIC); Joint Typhoon Warning Centre (JTWC);
Indonesia: BNPB, BMKG, PVMBG;
Malaysia: NADMA,
Philippines: NDRRMC, DSWD, PHIVOLCS;
Thailand: DDPM;
Viet Nam: VDDMA;
Various news agencies.
