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Residents travel by boat through flooded streets in Colombo after heavy rains from Cyclonic Storm Ditwah. Credit: UNICEF, Sri Lanka

By the Economic and Social Commission for Asia and the Pacific (ESCAP)
BANGKOK, Thailand, Dec 17 2025 (IPS)

Cyclones Ditwah and Senyar are indications of a shifting disaster riskscape, not anomalies. Both storms broke historical patterns: Ditwah tracked unusually south along Sri Lanka’s coast before looping into the Bay of Bengal, dumping over 375 mm of rain in 24 hours and triggering landslides.

Senyar, only the second cyclone ever recorded in the Strait of Malacca, intensified near the equator and stalled over Sumatra, worsening floods in Aceh and North Sumatra.

The rising human and economic toll

According to the ESCAP Asia-Pacific Disaster Report 2025: Rising Heat, Rising Risk, the Asia-Pacific region is entering an era of cascading risks driven by intensifying heat and extreme weather with marine heatwaves and warmer sea surface temperatures fueling this new normal.

Historical low-risk zones like Sri Lanka’s central hills and Thailand’s southern strip are now climate-risk hotspots.

The report projects that in South and South-West Asia alone, average annual flood losses could increase from US$47 billion historically to 57 billion.

Across Indonesia, Malaysia, the Philippines, Sri Lanka, Thailand and Viet Nam, the storms of late November 2025 caused more than 1,600 fatalities, left hundreds of people unaccounted for, and affected well over ten million people.

Widespread flooding and landslides displaced 1.2 million people, disrupted essential services and isolated numerous communities, underscoring the scale of the response required and the substantial economic fallout expected

The value of preparedness

While improved early warnings have reduced loss of life compared to past decades, these storms show that disasters are becoming more destructive. Yes, early warnings saved lives—impact-based forecasts triggered mass evacuations and community drills helped families reach safety. But thousands were still stranded.

Alerts arrived, yet on-the-ground implementation was unclear, and some evacuation routes were already flooded. In many cases, social media became the lifeline when official systems fell short.

The trend is clear: technology alone cannot save lives without trust and rehearsed responses. Warnings work only when people know what to do and feel confident acting.

The ESCAP multi-donor Trust Fund for Tsunami, Disaster and Climate Preparedness shows that investing in preparedness pays off many times over. Its 2025–26 call for proposals offers countries a chance to strengthen coastal resilience, integrate science and technology and embed community-led action — before the next storm season tests our readiness.

The lessons we must learn

• Trusted local networks and well-equipped community-led preparedness efforts make alerts meaningful

Early warnings have their limits. In many areas, alerts were issued and hotlines opened, yet fast-rising floods left families stranded, relying on rescue teams and volunteers. These events show that mobility constraints and uneven household preparedness can limit action even when information is available.

Community-led initiatives, such as those championed following the 2004 Indian Ocean tsunami, demonstrate how local knowledge and regular drills improve decision-making. Twenty years later, social cohesion has become a marker of resilience.

For example, the Bangladesh Cyclone Preparedness Programme (with 76,000 volunteers) has sharply reduced cyclone deaths by delivering house-to-house warnings and guiding evacuations.

• Urban growth without risk-informed planning magnifies disaster impacts

Ditwah and Senyar exposed how rapid urban growth without risk-informed planning magnifies disaster impacts. Colombo’s wetlands have shrunk by 40 per cent, while Hat Yai’s drainage was overwhelmed.

Many hard-hit towns in Sumatra were located in known landslide-risk zones, resulting in severe disruptions to hospitals, transport networks and local businesses.

When natural buffers disappear, rainfall that once drained slowly now floods cities within hours. Urban resilience depends on integrating risk into development planning by preserving wetlands, enforcing zoning and investing in drainage and flood defences.

Infrastructure alone is not enough; it must be designed for extremes. Cities that embed resilience into planning and protect natural systems are better positioned to withstand future storms and safeguard economic activity.

• Regional solidarity and shared solutions can save lives.

The Asia-Pacific region is faced with converging risks, with storms amplifying monsoonal hazards, cascading into mudslides and exacerbated by infrastructure weaknesses. Regional cooperation is no longer optional – it is the foundation for resilience in the most disaster-impacted region of the world.

November 2025 saw 8 countries (including Indonesia, Sri Lanka and Thailand) activate the International Charter on Space and Major Disasters, enabling rapid satellite imagery for emergency planning, proving the value of shared systems (see figure).

As floodwaters surged across the region, participants at the ESCAP Committee on Disaster Risk Reduction reaffirmed their commitment to regional early warning systems and anticipatory action – because hazards do not respect borders.

The Asia-Pacific region’s resilience depends on investing in people and preparedness cultures, regional solidarity, urban planning for extremes, protecting natural buffers and ensuring that last-mile guidance reaches every household.

Building generations and societies equipped to manage rising risks is the smartest investment for a safer future.

Source: ESCAP

IPS UN Bureau

 

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