Forms from the slow deposition of water vapour directly to ice on a surface. By accumulating slowly, hoar can form interlocking crystals that grow out from the surface. It generally exhibits a feather, fern, or flower pattern growing from the initial seed. Hoar forms only when winds are light, which is often the situation during clear, cold nights; thus it is the most common type of frost to those dwelling in non-mountainous areas. When we speak of frost, we are usually referring to hoar frost rather than rime frost.
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