Ice-dammed glacial lakes can empty in sudden catastrophic floods
Meltwater often ponds against a glacier tongue or moraine dam, building a turquoise lake that looks calm until the ice wall fails, floats, or tunnels open underneath.
When the seal breaks, the lake can drain in hours — a glacial lake outburst flood that surges down mountain valleys with ice blocks, mud, and boulders. Communities downstream treat these lakes as living hazards.
Beauty can be unstable. Glacial lakes show mountain hydrology at its most dramatic: water stored by ice, released when ice loses its grip.
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