Depth hoar are large crystals occurring at the base of a snowpack that form when uprising water vapor deposits or desublimates onto existing snow crystals. Depth hoar crystals are large, sparkly grains with facets that can be cup-shaped and that are up to 10 mm in diameter. Depth hoar crystals bond poorly to each other, increasing the risk for avalanches.
- The Avalanche Encyclopedia, extensive summary with animation of formation process
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