Heavy rains triggered the bursting of a Himalayan glacial lake, leading to catastrophic flash floods and landslides.
At least 18 people lost their lives, and nearly 100 were reported missing
Lhonak Lake, located in Sikkim state, overflowed on October 4th, 2023, due to a "sudden cloudburst." This event caused significant flooding, impacting the lives of approximately 22,000 people.
The disaster highlights the vulnerability of mountainous regions to the effects of climate change. Such incidents in South Asia's mountainous areas are increasingly attributed to the changing climate. The Indian Meteorological Department reported that Sikkim experienced 101 mm (4 inches) of rain in the first five days of October.
This amount was more than double the normal levels, resulting in floods worse than those in October 1968 when an estimated 1,000 people lost their lives.
The department has also forecasted heavy rainfall in the region for the coming days, adding to the ongoing challenges.
The flooding was exacerbated by the release of water from the Teesta V dam, operated by the state-run NHPC.
Local officials reported that four of the dam's gates had been washed away, raising questions about the timing of gate operations.
As of the latest update, 98 people were missing, including 17 army personnel. The floods washed away 14 bridges, further hampering rescue operations already challenged by relentless rain.
Neighboring Bangladesh is on high alert, as the Teesta River flows into Bangladesh downstream of Sikkim. The rise in the Teesta River's level could potentially inundate five districts in the northern part of Bangladesh.
The situation in Sikkim has been described as "slightly grim" by Prabhakar Rai, the director of Sikkim's State Disaster Management Authority.
Bad weather conditions have hindered rescue operations, and communication disruptions have added to the challenges.
Approximately 2,500 tourists are stranded in and around Chungthang town in Mangan district. Fortunately, they are in safe locations and will be evacuated by air once the weather conditions improve.
The state tourism department has advised potential visitors to postpone their trips to Sikkim. Efforts to evacuate those stuck in Mangan district are set to commence when the weather allows.
Satellite imagery has provided crucial insights into the disaster. It revealed that a significant portion of Lhonak Lake had drained following the cloudburst.
Lhonak Lake, a glacial lake at the foot of a melting glacier, has been identified as one of the fastest-swelling glacial lakes in the region, posing a high risk of glacial outburst.
Past expeditions and studies have highlighted this risk and called for mitigation measures.
Rescue work continues after flash floods in Sikkim's Rangpo town on October 5. The Himalayan region is particularly vulnerable to the impacts of climate change. Himalayan glaciers feed into rivers that provide freshwater to billions of people.
Rising temperatures have led to accelerated glacier melting, heightening the risk of floods, landslides, avalanches, and droughts.
As glaciers around the world continue to melt, the risk of catastrophic glacial lake outbursts increases.
The recent disaster underscores the urgent need for improved disaster preparedness and climate adaptation strategies in the region.
Policymakers and disaster management departments must equip themselves to respond effectively to such crises, given the heightened risk of extreme weather events.
The bursting of the Himalayan glacial lake in Sikkim serves as a stark reminder of the profound impact of climate change on vulnerable regions.
It highlights the immediate need for climate mitigation and adaptation measures to safeguard communities in the Himalayan region and beyond.
The tragedy also emphasizes the importance of early warning systems and disaster preparedness in the face of increasing climate-related disasters.