Occurs when the rate of frost formation is rapid, usually under conditions of high water content in the air (vapour and/or liquid) and at least moderate wind speeds. It forms by ice crystals growing on exposed surfaces in moist, freezing conditions. Surfaces could be rocks, boulders, cairns, fences, foliage etc. Rime is denser and harder than hoar frost and “grows” in the direction of the prevailing wind. Compare also with cornices, which are snow and “grow” towards the leeward side of ridges and cliffs.
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