KATHMANDU, APRIL 26
The Hindu Kush Himalaya (HKH) has recorded its lowest snowpack in 24 years of monitoring, falling 27.8 percent below the long-term average in 2026 - breaking last year's record low and marking the fourth consecutive year of below-normal snow persistence, according to the Snow Update Report 2026 released Thursday by the International Centre for Integrated Mountain Development (ICIMOD).
The findings point to what ICIMOD describes as a systemic collapse of seasonal snow reserves across the world's highest mountain range, with direct and immediate consequences for water security across 12 major river basins that together sustain nearly two billion people downstream.
Ten of the 12 monitored basins now have below-normal snow persistence. The Mekong, Tarim and Tibetan Plateau have recorded their lowest levels in the entire 24-year monitoring period. The steepest deficits are in the Mekong at minus 59.5 percent, the Tibetan Plateau at minus 47.4 percent and the Salween at minus 41.8 percent. Only the Ganges, at plus 16.3 percent, and the Irrawaddy, at plus 21.8 percent, recorded above-normal persistence - offering limited local relief but insufficient to offset the broader regional crisis.
The implications are severe and immediate. Seasonal snowmelt contributes up to 77.5 percent of annual runoff in the Helmand basin and 74.4 percent in the Amu Darya. Reduced snowmelt this year will directly constrain water availability for drinking, irrigation, hydropower and ecosystems across the region. Farmers in the Indus, Helmand and Amu Darya basins face irrigation shortfalls during early growing seasons. Hydropower operators on the Mekong, Yangtze - where the Three Gorges Dam operates - and the Brahmaputra should anticipate below-normal generation in early summer.
The crisis is compounded by the cumulative effect of four consecutive low-snow years, which have prevented groundwater and soil moisture from adequately replenishing. "Every dry spell will hit harder," the report warned, noting that the back-to-back deficits are progressively increasing vulnerability to future droughts across the region.
"What we are seeing is a persistent trend where the seasonal snow reservoir is shrinking, year after year," said Sher Muhammad, lead author of the HKH Snow Update 2026. "The 2026 numbers confirm a breaking point: ten out of twelve basins are below normal, and several have hit their lowest recorded persistence in two decades."
ICIMOD called on national and local agencies to activate drought preparedness and response plans immediately, integrate real-time snow data into water management decisions, invest in water storage and efficiency infrastructure, and strengthen transboundary cooperation on shared water resources. "Regional cooperation on these interconnected issues has now become urgent. We need to shift from emergency response to proactive, science-based governance," the report said.