REGIONAL SUMMARY:
During the twenty-sixth week of 2025, the ASEAN region experienced a total of 17 disaster events, including droughts, floods, storms, and wind-related disasters, affecting several Member States—specifically Indonesia, Thailand, and Viet Nam. In Indonesia, Badan Nasional Penanggulangan Bencana (BNPB) reported that several provinces were impacted, including Bangka Belitung, Banten, Jambi, West Java, Lampung, Maluku, Southeast Sulawesi, and North Sumatra. In Thailand, Department of Disaster Prevention and Mitigation (DDPM) reported flooding, storms, and strong winds in Chiang Rai, Nan, Satun, and Phatthalung. Meanwhile, in Viet Nam, Viet Nam Disaster and Dyke Management Authority (VDDMA) reported flooding across Lang Son, Thai Nguyen, and Bac Giang.
HIGHLIGHT:
In Thailand, on 27 June, DDPM reported severe flooding in Chiang Rai and Nan Provinces, Thailand, due to prolonged heavy rainfall. The floods affected 8 districts, 18 sub-districts, and 47 villages, with approximately 4,725 households impacted (DDPM). In response, DDPM Region 15, in coordination with the Provincial DDPM Office, local military units, district authorities, police officers, volunteers, non-governmental organizations (NGOs), and other relevant agencies, were swiftly mobilised to assess the damage and provide necessary assistance. To further support the response efforts, on 28 June, Prime Minister of Thailand, H.E. Ms. Paethongtarn Shinawatra visited the affected areas to monitor the ongoing flood response. During the visit, 1,000 relief items were provided, with special consideration given to vulnerable groups within the affected areas. The government continues to prioritise close monitoring of the situation and is committed to providing ongoing support to those impacted by the disaster.
Additionally, updated impact information on the M7.7 Mandalay Earthquake in Myanmar, based on DDM Myanmar report as of 29 June at 18:30 hrs utc+7, indicates that a total of 3,768 fatalities have been recorded, with 38 individuals missing and 5,104 others injured. Approximately 17 displaced persons currently residing in 100 evacuation centres, and 264K individuals who have sought shelter with relatives. The estimated economic losses are approximately USD 1.6 billion. Data collection and validation are still ongoing.
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 ASEAN Region, including Brunei Darussalam, Cambodia, Indonesia, Lao PDR, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Viet Nam. An area of convection (INVEST 98W) has persisted near 15.4N 132.6E, approximately 985 km east of Manila, the Philippines. Deterministic and ensemble models show low likelihood of development over the next two days. The potential for the development of a significant tropical cyclone within the next 24 hours is Low (JTWC).
GEOPHYSICAL:
Nine (9) significant earthquakes (M>5.0) were recorded by Indonesia’s Badan Meteorologi, Klimatologi, dan Geofisika (BMKG), Myanmar’s Department of Meteorology and Hydrology (DMH), and the Philippine Institute of Volcanology and Seismology (PHIVOLCS). Mount Ibu (alert level II), Dukono (alert level II), Lewotobi Laki-laki (alert level IV), Ili Lewotolok (alert level II), Raung (alert level II), and Semeru (alert level II) in Indonesia, and Kanlaon (alert level 3), 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, drier conditions are then predicted over southern Mainland Southeast Asia and the southern half of the Philippines, while warmer than usual temperatures are predicted over over most of the Maritime Continent as well as develop over southern Mainland Southeast Asia. For the regional assessment of extreme weather events, there is a low chance of very heavy rainfall occurring over the ASEAN region. Additionally, there is a small increase in the chance of extreme hot conditions to occurs over Western Maritime Continent, western Java, northern Sulawesi, Maluku Islands, western Papua, the central and southern Philippines, and southern Mainland Southeast Asia. ENSO neutral conditions are present
Sources:
ASEAN Disaster Monitoring & Response System (DMRS); ASEAN Specialised Meteorological Centre (ASMC); Joint Typhoon Warning Centre (JTWC);
Indonesia: BNPB, BMKG, PVMBG;
Myanmar: DDM, DMH;
Philippines: PHIVOLCS;
Thailand: DDPM, TMD;
Viet Nam: VDDMA;
Various news agencies.
