Relentless heatwave in Pakistan is accelerating glacier melt, threatening life downstream.
Northern Pakistan is entering what experts consider another high-risk Glacial Lake Outburst Flood (GLOF) season. The combination of unusually warm temperatures, rapid glacier melt, and periods of intense rainfall has created conditions in which unstable glacial lakes can suddenly release enormous volumes of water, rock, and sediment into valleys below. Pakistani authorities have issued repeated alerts throughout the spring and early summer of 2026 as these risks have increased.
A GLOF occurs when a lake formed by meltwater behind a natural dam of ice or loose rock (moraine) suddenly fails. The resulting flood can travel downstream at very high speeds, carrying boulders, trees, and debris that destroy roads, bridges, homes, farmland, and power infrastructure.
Northern Pakistan is especially vulnerable because it contains more than 13,000 glaciers—the largest concentration outside the polar regions. As glaciers retreat, they leave behind thousands of growing glacial lakes, many of which are unstable. Approximately 130 of these lakes are under active monitoring because they pose significant flood risks.
The GLOF problem in northern Pakistan is part of a wider climate challenge across the Himalaya-Karakoram-Hindu Kush region. Rising temperatures are causing glaciers to lose mass and creating new glacial lakes faster than many can be stabilized. Scientists expect the frequency of dangerous GLOFs to increase over the coming decades, making adaptation, monitoring, and early warning systems increasingly important alongside efforts to reduce global greenhouse gas emission
