Glacial lake outburst in Bhutan prompts alerts in Assam and West Bengal
Glacial lake outburst in Bhutan prompts alerts in Assam and West Bengal
Bhutan · Published Nov 1, 2026
• A glacial lake outburst flood (GLOF) occurred at Sintaphu Tsho in Bhutan on 29 October
• The lake, with an estimated water volume of 6.14 million cubic metres, experienced an outburst that led to precautionary alerts being issued downstream in India, particularly in Assam and West Bengal. The National Centre for Hydrology and Meteorology (NCHM) of Bhutan had previously conducted assessments of the lake, identifying its potential for GLOF events. The recent outburst highlights the growing risks posed by glacial meltwater in the Himalayan region.

Impact & Risks

The GLOF event at Sintaphu Tsho underscores the vulnerability of downstream regions, including Assam and West Bengal, to glacial lake outbursts. A 2026 study identified over 11,000 people, 2,500 buildings, 250 kilometres of roads, 400 bridges, and 20 square kilometres of agricultural land in Bhutan as being at risk from such events. While no casualties have been reported from this incident, the event serves as a reminder of the need for robust early-warning systems and disaster preparedness in the region.

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