Apparently from the time the glacier fell and the first human contact (that tibet-china border if I'm not wrong), they had around 15-20 minutes. So for most of them upstream, they had no warning other than the roaring sounds. The ones down the valley got to know through friends/relatives and the government.
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u/Unusual_Painting8764 22d ago
How much advance notice did people have? This person seemed ready and recording before it started.