REGIONAL SUMMARY:
During the thirty-fifth week of 2026, a total of six disaster events were reported across ASEAN, including droughts and floods. In addition to these events, disaster situations continued to be reported across the region. In Indonesia, the impacts of M7.7 earthquake and drought conditions across several provinces continued to be reported by Badan Nasional Penanggulangan Bencana (BNPB), along with recent flooding in North Sumatra and Central Sulawesi. In the Philippines, disaster situations continued to be reported by National Disaster Risk Reduction and Management Council (NDRRMC) due to the combined effects of Southwest Monsoon and Tropical Cyclones GAENARI and KUJIRA. Meanwhile, in Viet Nam, impacts associated with the Southwest Monsoon and Tropical Cyclone NARRA continued to be reported by Viet Nam Disaster and Dyke Management Authority (VDDMA).
HIGHLIGHT:
In Indonesia, according to BNPB, emergency response period for M7.7 Earthquake in East Nusa Tenggara has been extended until 12 September 2026, while response and early recovery operations remain ongoing. Authorities continue to focus on emergency assistance while accelerating rehabilitation and reconstruction planning in affected areas. As of 31 August at 0900H UTC+7, BNPB records 120 fatalities, 1,658 injured persons, and approximately 188,673 displaced persons. Meanwhile, in Viet Nam, impacts from Tropical Cyclone NARRA and Southwest Monsoon were reported by VDDMA. The latest figures indicate 4 fatalities and 3 injured persons. According to VDDMA as of 31 August at 0500H UTC+7 reports, 150 houses remained flooded in Lang Son and Hanoi, while 390 households remained isolated due to flooded access roads in Lang Son. The AHA Centre continues to closely monitor the situations and remains ready to support affected ASEAN Member States should the need arise.
HYDRO-METEO-CLIMATOLOGICAL:
During the past week, data from the ASEAN Specialised Meteorological Centre (ASMC) across Brunei Darussalam, Cambodia, Indonesia (northern parts of Sumatra and Kalimantan, as well as Papua), Lao PDR, Malaysia, Myanmar, the Philippines, Thailand, and Viet Nam. As of reporting, three tropical disturbances are being closely monitored. Two disturbances, RMNTS 17W and INVEST 96W, located over the East Viet Nam Sea / western Pacific Ocean, have a medium likelihood of developing into significant tropical cyclones, while INVEST 94W has a high likelihood of developing into a significant tropical cyclone (DMRS, JTWC).
GEOPHYSICAL:
Seven (7) significant earthquakes (M>5.0) were recorded by Indonesia’s Badan Meteorologi, Klimatologi, dan Geofisika (BMKG), including several aftershocks associated with the M7.7 earthquake in East Nusa Tenggara. Mount Sinabung (alert level II), Semeru (alert level III), Lewotobi Laki-laki (alert level III), Ili Lewotolok (alert level II), and Ibu (alert level II) in Indonesia, and Taal (alert level 1), Mayon (alert level 2), 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, drier and warmer-than-usual conditions are expected across much of the southern ASEAN region and parts of southern Mainland Southeast Asia, while wetter-than-usual conditions are forecast over much of the remaining northern ASEAN region. For regional assessment of extreme, there is a small increase in chance of very heavy rainfall events over parts of northeastern Mainland Southeast Asia, while extreme hot conditions are very likely to occur across much of the equatorial band between 10°N and 5°S. The El Niño – Southern Oscillation (ENSO) monitoring system state is “El Niño Conditions”. Strong El Niño conditions are predicted until at least the end of 2026. El Niño at this time of the year, typically brings drier conditions for much of the Maritime Continent, and to a lesser extent, some parts of Mainland Southeast Asia.
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;
Philippines: NDRRMC, PAGASA, PHIVOLCS;
Viet Nam: VDDMA;
Various news agencies.
