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The accumulation of ice on long thin objects (tree branches, wires) during fog. Rime can be crystalline or granular. Crystalline rime forms as a result of the sublimation of water vapor and consists of ice crystals that form primarily on the windward side under conditions of weak wind and temperatures below — 15°C. The crystals are usually approximately 1 cm long, but many reach several centimeters. Granular rime is a snowlike, friable ice that forms on the windward side of objects in foggy, windy weather, mainly in the mountains. It forms when drops of supercooled fog freeze. Granular rime can sometimes reach a thickness of 50 cm or more.
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