Avalanches in the Indian Himalaya Explained

In the high Himalaya, avalanches are sudden slides of snow, and sometimes ice and rock, down a steep mountain slope, and in India they threaten soldiers on the Siachen Glacier, trekkers and mountaineers, road workers and remote villages across Jammu and Kashmir, Ladakh, Himachal Pradesh, Uttarakhand, Sikkim and Arunachal Pradesh. A large avalanche can move at the speed of a fast car, and a person caught in one has only minutes to be rescued alive.

Last updated: 2 November 2026. This explainer covers how avalanches form, where they strike in India, what triggers them, the notable incidents involving soldiers and climbers, how forecasters at the Defence Geoinformatics and Research Establishment warn of danger and what mountain travellers can do to reduce their risk.

Key Takeaways

• Avalanches are rapid snow slides that occur mainly on slopes of about 30 to 45 degrees, and they can bury and kill people within moments.
• In India they are concentrated in the high Himalaya of Jammu and Kashmir, Ladakh, Himachal Pradesh, Uttarakhand, Sikkim and Arunachal Pradesh, with their heaviest toll on soldiers at high-altitude border posts such as Siachen.
• Heavy fresh snowfall, wind loading and sudden warming are the most common natural triggers, while many fatal avalanches involving people are triggered by the victims themselves.
• The Defence Geoinformatics and Research Establishment studies snow and avalanches and issues hazard forecasts for the Army and for civil authorities in snowbound regions.
• Survival chances fall sharply with burial time, so trained companions with beacons, probes and shovels are the best hope for a rescue.
• Warming winters and changing snowfall patterns may alter how and when avalanches occur, though the picture varies from region to region.

What is an avalanche?

An avalanche is a mass of snow that suddenly breaks loose from a mountain slope and slides, flows or tumbles downhill, often carrying ice, rocks and trees along with it. It happens when the weight of the snow, helped by gravity, exceeds the strength of the snowpack that holds it in place.

Snow lies on mountains in layers laid down by different storms, and each layer has different strength and grain structure. When a weak layer, such as loosely bonded crystals buried under a stronger slab, collapses, the snow above it can fracture and slide. Once moving, an avalanche can grow rapidly by picking up more snow along its path, and the debris often sets like concrete when it stops, making self-rescue almost impossible.

What are the main types of avalanche?

The main types of avalanche are loose snow avalanches, slab avalanches, powder avalanches and wet snow avalanches, and each behaves differently and poses a different danger. Slab avalanches cause the most deaths among people, because a cohesive plate of snow breaks away over a wide area with little warning.

Where do avalanches happen in India?

Avalanches happen in India across the snow-covered Himalaya, from the Karakoram and Kashmir in the north-west to Sikkim and Arunachal Pradesh in the east, with the greatest danger in areas of heavy winter snowfall and steep terrain. Roads, passes and military posts at high altitude are among the most exposed.

• Jammu and Kashmir and Ladakh: The Pir Panjal and Greater Himalaya ranges, including Gulmarg, the Gurez and Kupwara areas, Zojila and the Siachen region, see frequent avalanches in winter.
• Himachal Pradesh: Lahaul and Spiti, Kinnaur and the Rohtang and Baralacha passes are well known avalanche zones, and the Manali-Leh and Kinnaur routes are often blocked.
• Uttarakhand: High valleys in Chamoli, Uttarkashi and Pithoragarh, including the Badrinath, Gangotri and Mana areas, experience avalanches in winter and spring.
• Sikkim: The passes near Nathu La and the high valleys in the north of the state are exposed to snow slides.
• Arunachal Pradesh: Border posts in the Tawang and West Kameng areas face significant avalanche risk.

What triggers an avalanche?

An avalanche is triggered when the stress on a snow slope rises above its strength, which can happen because of new snowfall, wind, rising temperatures, rain on snow, an earthquake or the weight of a person or machine. Slope steepness, snow depth and the structure of the snowpack decide how readily it fails.

• Heavy snowfall: A large amount of new snow in a short time adds load faster than the snowpack can gain strength.
• Wind loading: Strong winds blow snow onto the sheltered side of a ridge, building unstable slabs.
• Rapid warming: Sudden warm spells or strong sun weaken the bonds between snow grains and add meltwater.
• Rain on snow: Rain adds weight and lubricates weak layers.
• Terrain traps and slope shape: Slopes of about 30 to 45 degrees, convex rolls and gullies that funnel snow concentrate danger.
• Human triggers: Skiers, climbers, trekkers, vehicles, explosions and noise can set off a slide on a delicate slope.
• Earthquakes and rockfall: Shaking or falling rock can release snow on an unstable slope.

How do avalanches affect soldiers at Siachen?

Avalanches are a constant threat to soldiers at Siachen and other high-altitude border posts, where troops live and patrol in extreme cold on steep glaciers and ridges, and a number of soldiers have died in avalanches over the years. Siachen, with posts at altitudes of more than 5,000 metres, is often described as the highest battlefield in the world, and weather causes far more casualties there than combat.

In February 2016 an avalanche buried an Army post in the Siachen area, and ten soldiers were lost. One of them, Lance Naik Hanamanthappa Koppad, was pulled alive from deep under the snow after about six days, but died in hospital a few days later, in an episode that gripped the country. Other avalanches have struck patrols and posts in Siachen, Kargil and Kashmir, and in Arunachal Pradesh in 2022 a group of soldiers died in an avalanche near the Kameng sector.

The Army trains troops in avalanche awareness, uses specialist rescue teams and dogs, and relies on forecasts from the DGRE to plan movement. Even so, remote posts and extreme conditions mean that risk can never be removed entirely.

Which avalanche incidents have affected trekkers and climbers in India?

Trekkers, climbers, skiers and road workers in India have been affected by several serious avalanches, including a 2022 avalanche on Draupadi Ka Danda II in Uttarakhand that killed many trainee mountaineers and a 2025 avalanche near Mana in Uttarakhand that trapped dozens of road workers. These incidents show how even experienced and well-organised groups can be caught.

Many mountaineering deaths in the Himalaya, including those in Himachal Pradesh and Uttarakhand, are caused by avalanches during climbs or while descending, and the toll often rises in autumn and spring climbing seasons.

Who forecasts avalanches in India?

Avalanches in India are forecast mainly by the Defence Geoinformatics and Research Establishment (DGRE), a DRDO laboratory at Chandigarh that studies snow, avalanches and cold-region hazards, and which has absorbed the earlier Snow and Avalanche Study Establishment. It issues hazard forecasts for the Army and for civil authorities in snowbound Himalayan regions.

DGRE operates field stations at high altitude where observers measure snow depth, temperature, wind and snow layers, and its scientists combine this ground data with weather information and satellite observations to produce forecasts. Bulletins classify the avalanche danger for different regions and give warnings that can be passed to road agencies, tourism departments and military units.

The Border Roads Organisation, the National Disaster Management Authority and state disaster agencies use these warnings to close roads, clear snow and plan movement. The NDMA has issued national guidelines on landslides and snow avalanches, which stress mapping of hazard zones, training of rescue teams and public awareness in snowy areas.

How can people stay safe from avalanches?

People can stay safe from avalanches by checking forecasts, avoiding steep slopes after heavy snow or wind, travelling with trained companions and carrying the right rescue equipment. Most people caught in avalanches are travelling in groups that did not realise the danger on the slope they chose.

• Check the avalanche and weather forecast before setting out, and be ready to turn back if conditions look dangerous.
• Avoid slopes of about 30 to 45 degrees after fresh snowfall, wind loading or sudden warming.
• Cross suspect slopes one person at a time and keep away from the zone below another group.
• Carry an avalanche transceiver, a probe and a shovel, and practise using them with your group.
• Travel with a qualified guide in unfamiliar terrain and register your trek with local authorities.
• If caught, try to move to the side, make swimming motions to stay near the surface and create an air space around your face before the snow stops.
• If a companion is buried, call for help but begin searching at once, because time is critical.

How quickly must a buried person be rescued?

A person buried in an avalanche must be rescued within about fifteen minutes to have a high chance of survival, because survival rates fall steeply after that time as the buried person runs out of air or suffers from cold and injury. Most people who survive burial are dug out by companions who were nearby, not by outside teams arriving hours later.

Rescuers use transceivers to locate buried companions, then probe the snow and dig quickly with shovels. Sniffer dogs and specialist teams, including those of the Army, the Indo-Tibetan Border Police and the National Disaster Response Force, are used for larger incidents. Heavy snow, thin air, fading light and the risk of further slides make operations difficult.

The Siachen rescue of 2016 showed that survival over several days is possible in rare circumstances, when an air pocket forms and the person is protected from the worst cold, though such outcomes are exceptional.

Is climate change affecting Himalayan avalanches?

Climate change is affecting Himalayan snow and ice, and scientists expect it to alter avalanche patterns, though the effects differ by region and the research is still developing. Warmer winters can mean more rain on snow and more wet-snow avalanches, while shifts in snowfall timing and intensity can change when slopes become unstable.

Higher temperatures also weaken permafrost and glaciers, which can release ice and rock that trigger mixed avalanches and flash floods, as in the Chamoli disaster of 2021. Heavy snowfall events interspersed with warm spells can build the type of fragile layering that leads to large slides. Researchers stress the need for long-term monitoring and more observation stations, since the Himalaya remains one of the least instrumented mountain regions in the world.

Bottom Line

Avalanches are a part of life in the high Himalaya, and they will continue to threaten soldiers, mountaineers and mountain communities in India. Good forecasting, hazard mapping, disciplined travel and well-practised rescue skills cannot eliminate the danger, but they can greatly reduce the number of families who lose someone to a slope of snow.

Frequently Asked Questions

What causes avalanches in the Indian Himalaya?

Avalanches in the Indian Himalaya are caused by heavy fresh snowfall, wind-loaded slabs, sudden warming and rain on snow acting on steep slopes of about 30 to 45 degrees. Humans, earthquakes and rockfall can also trigger them. Many deadly avalanches begin when weight is added to an already fragile snowpack.

Which parts of India have the most avalanches?

The parts of India with the most avalanches are Jammu and Kashmir, Ladakh, Himachal Pradesh and Uttarakhand, along with Sikkim and Arunachal Pradesh. Passes such as Zojila and Rohtang, the Siachen Glacier and high valleys such as Mana and Gurez are particularly exposed in winter and spring.

Who issues avalanche warnings in India?

Avalanche warnings in India are issued mainly by the Defence Geoinformatics and Research Establishment (DGRE), a DRDO laboratory in Chandigarh that grew out of the Snow and Avalanche Study Establishment. It provides forecasts to the Army and civil authorities in snowbound Himalayan regions, who use them to close roads and plan movement.

How do avalanches affect soldiers at Siachen?

Avalanches are one of the biggest threats to soldiers at Siachen, where extreme cold, steep glaciers and heavy snowfall make posts vulnerable. Several soldiers have died in avalanches over the years, including a 2016 incident in which one soldier was found alive after about six days under the snow, though he did not survive.

How long can a person survive under an avalanche?

Survival chances are highest in the first fifteen minutes under an avalanche and fall steeply afterwards, as the buried person runs out of air or suffers from cold and injuries. Survival over many hours or days is rare and depends on an air pocket and protection from the cold. Quick rescue by companions is vital.

How can trekkers avoid avalanche danger in India?

Trekkers can avoid avalanche danger by checking weather and avalanche forecasts, avoiding steep slopes after fresh snow or wind, crossing risky slopes one at a time and travelling with a qualified guide. Carrying a transceiver, probe and shovel and knowing how to use them is essential, particularly on winter and spring routes in the high Himalaya.

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