What is Risk Analysis in the Context of Natural Disaster Events
Risk analysis for natural disasters assesses the likelihood and consequences of hazards such as floods, landslides, and extreme weather. It evaluates exposure to physical, operational, and humanitarian impacts. In central Vietnam, heavy rainfall events during the late monsoon season frequently trigger landslides and flash floods, historically causing casualties, transportation blockages, and prolonged recovery phases. Understanding these risks enables authorities and businesses to implement early mitigation and continuity measures before conditions escalate.
Executive Summary
- Date of Event: 21 November 2025
- Location: Central Vietnam
- Risk Category: Natural Disasters
- Severity Score: 4 / 5
- Confidence Level: 80 %
Flash flood and landslide warnings have been issued for central Vietnam amid continuous heavy rain and saturated soils. Historical patterns show recurrent multi-day rainfall during November leading to fatal landslides, flooded transport routes and infrastructure strain. Elevated risk is expected for two to five days, with potential transport, utility and operational disruptions lasting one to two weeks in affected provinces.
Known Hotspots and Sensitive Areas
High Impact:
- Da Nang City: Low-lying coastal wards prone to rapid urban flooding, especially along the Hàn River and drainage-constrained districts.
- Quảng Ngãi: Mountainous communes in Trà Bồng, Sơn Hà and Sơn Tây with a history of deep-seated landslides and road blockages along provincial connectors.
- Lâm Đồng: Slope-adjacent settlements around Bảo Lộc and Đà Lạt, where persistent rainfall increases landslide likelihood on hill roads and agricultural valleys.
Medium Impact:
- Gia Lai: Highlands districts such as Kbang and An Khê with documented flash-flood channels and vulnerable inter-commune roads.
- Đắk Lắk: Rural riverine areas near Ea H’leo, Krông Năng and Buôn Đôn facing flooding from upstream catchments and hydropower discharge.
- Khánh Hòa: Coastal and peri-urban areas of Nha Trang subject to short-duration inundation, with mountainous hinterlands (Diên Khánh, Khánh Vĩnh) vulnerable to landslides.
Low Impact:
- Urban centres geographically removed from slope-based hazards
Recurrent late-November rainfall and antecedent saturation significantly heighten flood and landslide risk across central Vietnam.
Impact on Transportation and Services
- Roads: Sections of QL1A and mountain connectors may be blocked 12–72 hours by landslides and flash floods; coastal routes remain vulnerable.
- Logistics: Freight delays expected due to road closures; riverine transport may halt when downstream levels rise.
- Utilities: Localised power and water outages possible where flooding disrupts distribution or treatment systems.
- Business Operations: Workforce displacement, temporary site closures, and delay of deliveries likely.
- Communications: Telecom degradation possible in remote communes due to pole or antenna damage.
Recommended Actions
Immediate Actions
- Activate the IRT within thirty minutes and confirm staff safety.
- Order evacuations for personnel in slope-adjacent, low-lying, or riverine areas.
- Suspend fieldwork and halt employee travel across affected roads.
- Shut down machinery, raise portable assets, and deploy sandbags at exposed sites.
- Issue customer notifications within two hours on expected delays.
Strategic Long-Term Measures
- Establish redundant logistics pathways to avoid chronic QL1A constraints.
- Maintain cloud backups and remote-access capability for critical teams.
- Prepare procurement and relocation plans for high-value inventory.
- Document all protective actions to support insurance and regulatory reporting.
Multidimensional Impact
Flood and landslide operations will strain provincial emergency resources and may slow essential recovery tasks.
Emergency Contacts
- Vietnam National Search and Rescue: 112
- NCHMF Weather Updates: nchmf.gov.vn
- Police / Ambulance / Fire: 113 / 115 / 114
Final Thoughts
Flash-flood and landslide risk will remain critical for the next two to five days. Businesses should anticipate intermittent closures, prolonged delivery delays, and potential asset damage. A proactive approach, anchored in early evacuation, asset protection, and alternative logistics planning, will reduce exposure. Stay ahead of operational risks with real-time alerts, scenario modeling, and expert advisories with datasurfr’s Predict. Start your 14-day free trial of Datasurfr’s Risk Intelligence Platform today.