A cornice fall avalanche can occur
when cornice break loose from the windy side of ridges.
Cornices look like frozen ocean waves stretched along mountain ridges. They form their eaves of braced snow when prevailing winds remove snow from slopes on one side of a ridge and deposit it on the other side of the ridge.
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Roof Fall Avalanches Ice Fall Avalanches Slab Avalanches Loose Snow Avalanches