Hindu Kush Himalaya region to face drier monsoon, but threats of climate-induced hazards remain: New analysis

A new analysis of the Hindu Kush Himalaya (HKH) region projects drier monsoon conditions in coming seasons but simultaneously warns that the frequency and in...

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A new analysis of the Hindu Kush Himalaya (HKH) region projects drier monsoon conditions in coming seasons but simultaneously warns that the frequency and intensity of climate-induced hazards — floods, landslides, and Glacial Lake Outburst Floods (GLOFs) — will remain high or increase.
Four of the eight HKH regional countries recorded more than 10 major disasters in 2025 alone, with economic losses exceeding USD 6 billion in 2024 from water-related hazards.
ICIMOD (International Centre for Integrated Mountain Development) has developed a revised Multi-Hazard Risk Assessment (MHRA) framework to model interacting hazard chains in the region.
The paradox of drier monsoon conditions combined with increasing hazard risk reflects a core feature of climate change in mountain regions: even with reduced total rainfall, precipitation arrives in shorter, more intense bursts — increasing flood and landslide risk while reducing overall water availability.
Rising temperatures are accelerating glacial melt, creating new glacial lakes that pose GLOF risk to downstream communities across India, Nepal, Bhutan, and Pakistan.

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The Hindu Kush Himalaya (HKH) Region

The Hindu Kush Himalaya is the world's third-largest concentration of snow and ice after the Arctic and Antarctic, earning it the designation "Third Pole". It is also called the "Water Tower of Asia" because it feeds ten of Asia's largest river systems, upon which nearly two billion people depend for freshwater, agriculture, and hydropower.

The HKH extends approximately 3,500 km from Afghanistan in the west to Myanmar in the east.
Eight regional countries: Afghanistan, Bangladesh, Bhutan, China, India, Myanmar, Nepal, and Pakistan.
Source of 10 major river systems: Amu Darya, Indus, Ganges, Brahmaputra, Irrawaddy, Salween, Mekong, Yangtze, Yellow River, and Tarim.
The region contains over 54,000 glaciers — the largest outside polar regions.
ICIMOD (International Centre for Integrated Mountain Development), headquartered in Kathmandu, is the regional intergovernmental knowledge body for the HKH — it serves all eight regional member countries.

Connection to this news: The HKH is warming approximately twice as fast as the global average, making projections about monsoon patterns and hazard cascades in this region uniquely consequential for food and water security across South and Southeast Asia.

Glacial Lake Outburst Floods (GLOFs)

A Glacial Lake Outburst Flood (GLOF) occurs when the natural dam retaining a glacial lake — typically a moraine (a ridge of glacial debris) or an ice dam — fails suddenly, releasing a catastrophic volume of water and sediment downstream. As temperatures rise, glaciers retreat and melt faster, forming new proglacial lakes and destabilising existing ones.

GLOFs can release millions of cubic metres of water within minutes, travelling at speeds that leave little warning time for downstream populations.
Triggering events include: heavy rainfall, earthquakes, avalanches, undermining of ice-cored moraines by warming, and seepage.
Over 200 glacial lakes in the Himalayas are considered at risk of outburst.
Notable Indian examples: the 2013 Kedarnath disaster (Uttarakhand), the 2021 Chamoli disaster (Uttarakhand), and the 2023 South Lhonak Lake outburst in Sikkim that inundated the Teesta River valley.
The National Disaster Management Authority (NDMA) has issued GLOF-specific guidelines for risk assessment and early warning systems in Himalayan states.

Connection to this news: The combination of drier monsoon (less total rainfall) but intensified precipitation events will continue to fill and destabilise glacial lakes, making GLOFs one of the most acute near-term climate hazards for northern India, Nepal, and Bhutan regardless of overall monsoon rainfall trends.

Monsoon Variability and Climate Change

The South Asian monsoon is driven by the differential heating of land and sea — the Indian Ocean heats up more slowly than the subcontinent, creating a pressure differential that draws moisture-laden winds onshore from June to September. Climate change is altering this system in multiple and sometimes contradictory ways: weakening average monsoon intensity in some models while increasing sub-seasonal variability (more extreme wet spells and prolonged dry breaks).

The Intergovernmental Panel on Climate Change (IPCC) AR6 projects a likely increase in mean monsoon precipitation over South Asia in the long term, but with increased year-to-year variability and more extreme events.
Mountain regions like the HKH experience elevation-dependent warming — temperatures at higher altitudes rise faster than at lower altitudes, accelerating glacier melt disproportionately.
A drier monsoon over the HKH specifically can reduce river flows fed by monsoonal rain while glacier melt (initially) compensates — but as glaciers shrink, this "glacier melt buffer" will eventually disappear (the "peak water" concept).
The Himalayan region is particularly susceptible to compound hazards: a single event (e.g., heavy rain on a weakened moraine) can simultaneously trigger floods, landslides, and a GLOF.

Connection to this news: The projected drier monsoon in the HKH is consistent with IPCC modelling that shows spatial redistribution of monsoon rainfall — wetter in the Gangetic plains, drier in the upland Himalayan catchments — amplifying downstream flood risk while reducing high-altitude water replenishment.

Disaster Risk Reduction (DRR) Framework — Sendai Framework

International disaster risk management is governed by the Sendai Framework for Disaster Risk Reduction 2015–2030, adopted in Sendai, Japan in March 2015 under the aegis of the United Nations Office for Disaster Risk Reduction (UNDRR). It succeeded the Hyogo Framework for Action (2005–2015) and is the first major international agreement of the post-2015 development agenda.

The Sendai Framework has four priorities: understanding disaster risk; strengthening disaster risk governance; investing in risk reduction; enhancing disaster preparedness for effective response.
Its seven global targets include reducing disaster mortality, economic losses, and infrastructure damage, and substantially increasing the number of countries with national and local DRR strategies.
India's apex disaster management body is the National Disaster Management Authority (NDMA), established under the Disaster Management Act, 2005.
India's State Disaster Risk Management Plans and river basin-level early warning systems are relevant instruments for HKH hazard mitigation.

Connection to this news: ICIMOD's revised Multi-Hazard Risk Assessment framework aligns with Sendai Priority 1 (understanding disaster risk) and Priority 4 (preparedness). The analysis underscores the need for transboundary DRR cooperation among HKH nations.

Key Facts & Data

HKH extent: ~3,500 km; eight regional countries
HKH glaciers: over 54,000 — world's third-largest ice concentration ("Third Pole")
River systems sourced: 10 major Asian rivers; water for ~2 billion people
Major disasters in four HKH countries in 2025: more than 10 per country
Economic losses from water hazards (2024): over USD 6 billion across HKH region
ICIMOD headquarters: Kathmandu, Nepal
Vulnerable glacial lakes in Himalayas: over 200 identified at GLOF risk
India GLOF examples: Kedarnath 2013, Chamoli 2021, Sikkim (South Lhonak) 2023
Sendai Framework period: 2015–2030; adopted March 2015
India's DRR authority: NDMA, under Disaster Management Act 2005