REGIONAL SUMMARY:
During the thirty-sixth week of 2025, a total of 11 disaster events were recorded across ASEAN region, including flooding and landslides incidents affecting Indonesia, the Philippines, Thailand, and Viet Nam. In Indonesia, Badan Nasional Penanggulangan Bencana (BNPB) reported incidents in East Kalimantan and Central Sulawesi. In the Philippines, the National Disaster Risk Reduction and Management Council (NDRRMC) reported flooding and landslides in Regions II, III, VI, and NCR, caused by the Southwest Monsoon and Tropical Cyclones PEIPAH and TAPAH. Meanwhile, in Thailand, the Department of Disaster Prevention and Mitigation (DDPM) documented flooding and landslides across Phitsanulok, Phetchabun, Phichit, Uttaradit, Chaiyaphum, Kalasin, Roi Et, Udon Thani, Chanthaburi, and Phra Nakhon Si Ayutthaya provinces. In Viet Nam, Disaster and Dyke Management Authority (VDDMA) reported flooding and landslides affecting Gia Lai, Dak Lak, and Lam Dong provinces.
HIGHLIGHT:
In Thailand, DDPM reported that, as of 8 September at 0600H (UTC+7), the monsoon trough extended across the lower northern, upper central, and lower northeastern regions. Together with the prevailing moderate southwest monsoon over the Andaman Sea, the southern region, and the Gulf of Thailand, this has led to flooding and landslides in 10 provinces, Phitsanulok, Phetchabun, Phichit, Uttaradit, Chaiyaphum, Kalasin, Roi Et, Udon Thani, Chanthaburi, and Phra Nakhon Si Ayutthaya. These events have affected 37 districts, 187 sub-districts, and 874 villages, with 30,597 households (113,209 people) affected. As of reporting time, the situation remains in 5 provinces—Phitsanulok, Phetchabun, Phichit, Kalasin, and Phra Nakhon Si Ayutthaya—covering 21 districts, 125 sub-districts, and 586 villages, where 15,306 households (56,632 people) continue to be affected. Relevant government authorities have carried out necessary actions to address the situation.
HYDRO-METEO-CLIMATOLOGICAL:
For the past week, data from the ASEAN Specialised Meteorological Centre (ASMC) indicated high 7-day average rainfall concentrated across Brunei Darussalam, Cambodia, Indonesia, Lao PDR, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Viet Nam. As of reporting, Tropical Cyclone TAPAH has moved outside ASEAN region. Meanwhile, a tropical disturbance (Invest 92S) over Indian Ocean is being monitored for its potential development into a significant tropical cyclone (JTWC).
GEOPHYSICAL:
Six (6) significant earthquakes (M>5.0) were recorded by Indonesia’s Badan Meteorologi, Klimatologi, dan Geofisika (BMKG), Myanmar’s Department of Meteorology and Hydrology (DMH), Thai Meteorological Department (TMD), and the Philippines Institute of Volcanology and Seismology (PHIVOLCS). Mount Marapi (alert level II), Semeru (alert level II), Lewotobi Laki-laki (alert level IV), Ili Lewotolok (alert level III), and Ibu (alert level II) in Indonesia, and Kanlaon (alert level 2), Taal (alert level 1), Mayon (alert level 1), and Bulusan (alert level 1) volcanoes in the Philippines reported recent volcanic activity according to Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) and PHIVOLCS.
OUTLOOK:
According to the ASEAN Specialised Meteorological Centre (ASMC), for the coming week, wetter conditions are predicted over much of the equatorial region. For the regional assessment of extreme weather events, there is a low chance of very heavy rainfall conditions to occurs over southern Maritime Continent; and there is a small increase in chance of extreme hot conditions to occurs over northwestern and southern Maritime Continent. While ENSO neutral conditions have been present, models predict potential for La Niña conditions to develop in the coming months.
Sources:
ASEAN Disaster Monitoring & Response System (DMRS); ASEAN Specialised Meteorological Centre (ASMC); Joint Typhoon Warning Centre (JTWC);
Indonesia: BNPB, BMKG, PVMBG;
Myanmar: DMH;
Philippines: NDRRMC, PAGASA, PHIVOLCS;
Thailand: DDPM, TMD;
Viet Nam: VDDMA;
Various news agencies.
